22.1 Acute Ambulatory Fractures & Initial Splinting

ABFM Family Medicine Certification Study Guide Exam

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1 Chapter 1: Exam Structure, Blueprint & Clinical Decision-Making

1.1 Exam Blueprint, FMCLA vs. One-Day Exam & Board Scoring 1.2 Clinical Reasoning, Test-Taking Strategy & Ambiguity Management 1.3 Evidence-Based Medicine & Clinical Practice Guidelines in Primary Care

2 Chapter 2: Healthcare Systems, Practice Management & Quality

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3 Chapter 3: Ethics, Law, Biostatistics & Health Equity

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4 Chapter 4: Lifestyle Counseling & Behavior Change

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5 Chapter 5: Nutrition, Physical Activity & Chronic Disease Prevention

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6 Chapter 6: Routine Adult Immunizations

6.1 ACIP Adult Respiratory Vaccines: Influenza, COVID-19, RSV & Pneumococcal 6.2 ACIP Adult Non-Respiratory Vaccines: Tdap, Shingrix, HPV & Hep B 6.3 Immunizations in Special Populations: Pregnancy, Asplenia & Immunocompromise

7 Chapter 7: Pediatric Health Maintenance & Surveillance

7.1 Newborn Examination & Early Postnatal Care 7.2 Well-Child Care, Developmental Surveillance & Milestones 7.3 Pediatric & Adolescent Screening: Vision, Hearing, Anemia & Lead 7.4 Pediatric Oral Health, Dental Screening & Fluoride

8 Chapter 8: Behavioral Health & Safety Screening

8.1 Primary Care Depression, Anxiety & Behavioral Health Screening 8.2 Domestic Violence, Intimate Partner Violence & Firearm Safety 8.3 Occupational Health & Recreational Safety Counseling

9 Chapter 9: Adult Preventive Screening: Cardiovascular & Metabolic

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10 Chapter 10: Adult Cancer Screening: Breast & Gynecologic

10.1 Breast Cancer Screening & Risk-Assessment 10.2 Cervical Cancer Screening & ASCCP Algorithms 10.3 Skin Cancer Clinical Assessment & Counseling

11 Chapter 11: Adult Cancer Screening: Colorectal, Lung & Prostate

11.1 Colorectal Cancer Screening Modalities & Intervals 11.2 Lung Cancer Screening with Low-Dose CT 11.3 Prostate Cancer Screening & Shared Decision-Making

12 Chapter 12: Sexual Health, Infectious Disease Screening & Contraception

12.1 Sexual Health Counseling & Risk-Reduction Strategies 12.2 STI Screening: Chlamydia, Gonorrhea, Syphilis & Trichomoniasis 12.3 Bloodborne Infectious Disease Screening: HIV & Hepatitis C

13 Chapter 13: Reproductive Life Planning, Lactation & Preoperative Care

13.1 Preconception Planning & Comprehensive Contraception Management 13.2 Lactation Support & Breastfeeding Counseling 13.3 Preoperative Medical Evaluation & Pre-Participation Sports Exam

14 Chapter 14: Emergent Cardiovascular Conditions

14.1 Acute Coronary Syndromes & Myocardial Infarction 14.2 Acute Chest Pain Risk Stratification & Triage 14.3 Acute or Critical Valvular Heart Emergencies

15 Chapter 15: Cardiac Arrhythmias, Heart Failure & Hypertensive Crises

15.1 Acute Atrial & Ventricular Arrhythmias 15.2 Acute Decompensated Heart Failure & Cardiogenic Shock 15.3 Hypertensive Emergency & Urgency Management

16 Chapter 16: Vascular & Thromboembolic Emergencies

16.1 Pulmonary Embolism & Deep Vein Thrombosis 16.2 Acute Aortic Syndromes & Peripheral Vascular Emergencies 16.3 Critical Limb Ischemia & Acute Arterial Occlusion

17 Chapter 17: Neurologic Emergencies: Stroke & Altered Consciousness

17.1 Acute Ischemic Stroke & Intracranial Hemorrhage 17.2 Syncope Evaluation & Status Epilepticus 17.3 Acute Delirium, Encephalopathy & Severe Confusion

18 Chapter 18: Neurologic Trauma & Acute Cranial Emergencies

18.1 Concussion, Moderate-to-Severe TBI & Intracranial Injury 18.2 Thunderclap & Acute Severe Secondary Headaches 18.3 Acute Ophthalmologic Emergencies

19 Chapter 19: Acute Abdominal, Pelvic & Gastrointestinal Emergencies

19.1 Acute Abdominal & Pelvic Pain Triage 19.2 Upper & Lower Gastrointestinal Bleeding 19.3 Acute Hepatic Failure, Cholangitis & Severe Jaundice

20 Chapter 20: Acute Pulmonary & Airway Emergencies

20.1 Acute Hypoxic Respiratory Failure & ARDS 20.2 Severe Community-Acquired Pneumonia & Empyema 20.3 Acute Severe Epistaxis & Airway Obstruction

21 Chapter 21: Acute Traumatic Injuries & Wound Care

21.1 Major Trauma Resuscitation & Initial Assessment 21.2 Burn Assessment, Inhalation Injury & Resuscitation 21.3 Laceration Management, Complex Wounds & Animal Bites

22 Chapter 22: Acute Orthopedic & Musculoskeletal Emergencies

22.1 Acute Ambulatory Fractures & Initial Splinting 22.2 Compartment Syndrome & Major Orthopedic Trauma 22.3 Septic Arthritis & Acute Microcrystalline Crises

23 Chapter 23: Severe Infections, Sepsis & Systemic Emergencies

23.1 Sepsis, Septic Shock & Initial Fluid Resuscitation 23.2 Necrotizing Soft Tissue Infections & Severe CNS Infections 23.3 Anaphylaxis Diagnosis, Epinephrine Dosing & Airway Protection

24 Chapter 24: Metabolic, Endocrine & Electrolyte Emergencies

24.1 Diabetic Ketoacidosis & Hyperosmolar Hyperglycemic State 24.2 Critical Electrolyte Emergencies: Dyskalemias & Dysnatremias 24.3 Severe Calcium Abnormalities & Acute Adrenal Crisis

25 Chapter 25: Hematologic, Urologic & Dental Emergencies

25.1 Severe Symptomatic Anemias & Coagulopathic Emergencies 25.2 Testicular Torsion, Priapism & Acute Urinary Retention 25.3 Urgent Odontogenic Infections & Dental Trauma

26 Chapter 26: Psychiatric, Behavioral & Obstetric/Gynecologic Emergencies

26.1 Suicidal Ideation, Acute Agitation & Behavioral Emergencies 26.2 Acute Physical & Sexual Assault Care 26.3 Life-Threatening Vaginal Bleeding & Ectopic Pregnancy 26.4 Environmental Heat Stroke & Severe Hypothermia

27 Chapter 27: Acute Head, Neck & Neurologic Symptoms

27.1 Primary Acute Headaches: Migraine, Tension & Cluster 27.2 Concussion & Minor Closed Head Injury Evaluation 27.3 Transient Ischemic Attack Evaluation & ABCD2 Risk Scoring

28 Chapter 28: Acute Cranial Nerves, Hearing & Sensory Symptoms

28.1 Peripheral Neuropathies: Bell's Palsy, Carpal Tunnel & Radiculopathy 28.2 Acute Tinnitus, Sudden Sensorineural Hearing Loss & Cerumen Impaction 28.3 Acute Dizziness, Benign Paroxysmal Positional Vertigo & Vestibular Neuritis

29 Chapter 29: Acute Upper Respiratory Tract Infections

29.1 Acute Viral Rhinosinusitis vs. Bacterial Rhinosinusitis 29.2 Acute Pharyngitis: Group A Streptococcus & Centor Criteria 29.3 Acute Otitis Media, Otitis Externa & Serous Effusion

30 Chapter 30: Acute Lower Respiratory Infections & Cough

30.1 Influenza, COVID-19 & Viral Respiratory Syndromes 30.2 Acute Bronchitis & Lower Respiratory Tract Infections 30.3 Ambulatory Community-Acquired Pneumonia

31 Chapter 31: Allergic, Nasal & Non-Infectious Pulmonary Conditions

31.1 Allergic Rhinitis & Acute Non-Anaphylactic Allergic Reactions 31.2 Acute Dyspnea in Ambulatory Care 31.3 Interstitial Lung Diseases & Sarcoidosis Presentation

32 Chapter 32: Acute Chest, Cardiac & Vascular Symptoms

32.1 Palpitations Evaluation & Arrhythmia Triage in Primary Care 32.2 Deep Vein Thrombosis & Superficial Thrombophlebitis 32.3 Ambulatory Hypotension & Orthostasis Evaluation

33 Chapter 33: Acute Upper Gastrointestinal Conditions

33.1 Peptic Ulcer Disease & Gastritis 33.2 Dysphagia, Esophagitis & Acute Esophageal Disorders 33.3 Acute Nausea, Vomiting & Foodborne Illness

34 Chapter 34: Acute Lower Gastrointestinal Conditions

34.1 Acute Infectious Diarrhea & Gastroenteritis 34.2 Acute Constipation & Functional Bowel Changes 34.3 Ano-Rectal Disorders: Hemorrhoids, Fissures, Abscesses & Pruritus Ani

35 Chapter 35: Inflammatory, Functional & Malabsorptive GI Disorders

35.1 Acute Flares of Inflammatory Bowel Disease 35.2 Irritable Bowel Syndrome: Diagnosis, Subtyping & Management 35.3 Celiac Disease & Malabsorption Syndromes

36 Chapter 36: Acute Abdominal, Hepatic & Biliary Disorders

36.1 Ambulatory Abdominal & Pelvic Pain Triage 36.2 Acute Cholecystitis, Biliary Colic & Pancreatitis 36.3 Acute Liver Injury & Viral Hepatitis

37 Chapter 37: Acute Abdominal Wall, Hernias & Dental Conditions

37.1 Abdominal Wall, Inguinal & Ventral Hernias 37.2 Acute Dental Pain, Odontogenic Abscess & Aphthous Ulcers 37.3 Acute Edema: Unilateral vs. Bilateral Diagnostic Evaluation

38 Chapter 38: Acute Infectious Dermatoses

38.1 Bacterial Skin Infections: Impetigo, Cellulitis & Cutaneous Abscesses 38.2 Fungal Skin Infections: Tinea Corporis, Cruris, Pedis & Onychomycosis 38.3 Viral Cutaneous Infections: Herpes Simplex, Zoster & Molluscum Contagiosum

39 Chapter 39: Inflammatory, Allergic & Autoimmune Dermatoses

39.1 Atopic Dermatitis, Contact Dermatitis & Eczematous Flares 39.2 Non-Infectious Rashes: Urticaria, Drug Eruptions & Erythema Multiforme 39.3 Cutaneous Malignancies & Premalignant Lesions: AK, BCC, SCC & Melanoma

40 Chapter 40: Acute Shoulder, Elbow & Upper Extremity Injuries

40.1 Rotator Cuff Pathology, Tendinopathy & Shoulder Impingement 40.2 Lateral & Medial Epicondylitis, Olecranon Bursitis & Elbow Sprains 40.3 Wrist & Hand Soft-Tissue Injuries: De Quervain, TFCC & Finger Sprains

41 Chapter 41: Acute Knee, Ankle & Lower Extremity Injuries

41.1 Meniscal Tears, Ligamentous Knee Injuries & Patellofemoral Pain 41.2 Ankle Sprains, Ottawa Ankle Rules & Achilles Tendinopathy 41.3 Plantar Fasciitis, Shin Splints & Overuse Syndromes

42 Chapter 42: Acute Ambulatory Fractures & Dislocations

42.1 Distal Radius, Scaphoid & Common Upper Extremity Fractures 42.2 Metatarsal, Clavicle & Common Lower Extremity Fractures 42.3 Joint Dislocation Management: Nursemaid's Elbow & Shoulder Subluxation

43 Chapter 43: Acute Axial Musculoskeletal Pain & Falls

43.1 Acute Low Back Pain: Red Flags, Strain & Disc Herniation 43.2 Acute Cervical Strain, Whiplash & Axial Neck Pain 43.3 Evaluation of Falls in Ambulatory & Older Patients

44 Chapter 44: Acute Inflammatory Arthropathies & Generalized Pain

44.1 Acute Inflammatory Arthritis & Spondyloarthropathies 44.2 Myalgias, Rhabdomyolysis & Post-Viral Pain Syndromes 44.3 Acute Non-Headache Pain Management Strategies

45 Chapter 45: Acute Renal, Urinary & Genitourinary Conditions

45.1 Uncomplicated UTI, Pyelonephritis & Acute Urethritis 45.2 Hematuria Workup & Glomerulonephritis 45.3 Nephrolithiasis & Acute Urinary Tract Obstruction

46 Chapter 46: Acute Male Genitourinary & Prostatic Conditions

46.1 Acute Prostatitis, Epididymitis & Orchitis 46.2 Acute Scrotal Pain: Torsion vs Appendage, BPH & Male Genital Emergencies 46.3 Acute Urinary Retention & Incontinence Evaluation

47 Chapter 47: Acute Women's Health & Early Pregnancy Care

47.1 Early Pregnancy Diagnosis, Dating & Initial Complications 47.2 Abnormal Uterine Bleeding & Acute Menstrual Disorders 47.3 Premenstrual Syndrome & Premenstrual Dysphoric Disorder

48 Chapter 48: Breast Disorders, STIs & Pediatric Elimination

48.1 Palpable Breast Mass, Mastitis & Nipple Discharge 48.2 Sexually Transmitted Infections: Diagnosis, Staging & CDC Guidelines 48.3 Pediatric Enuresis & Encopresis

49 Chapter 49: Systemic Signs, Metabolic Dysregulation & Miscellaneous Infections

49.1 Acute Fever, Sepsis Screening & FUO in Primary Care 49.2 Acute Hyperglycemia & Symptomatic Hypoglycemia 49.3 Electrolyte Abnormalities: Mild-to-Moderate Disturbances 49.4 Vector-Borne, Tick-Borne & Rickettsial Illnesses

50 Chapter 50: Chronic Cardiovascular Diseases: Hypertension & Ischemia

50.1 Essential Hypertension Management: 2025 AHA/ACC Guideline & JNC Strategies 50.2 Chronic Coronary Artery Disease & Post-MI Secondary Prevention 50.3 Chronic Heart Failure: HFrEF, HFpEF & Quadruple GDMT

51 Chapter 51: Chronic Vascular, Valvular & Dyslipidemic Diseases

51.1 Peripheral Arterial Disease & Claudication 51.2 Chronic Valvular Heart Disease & Murmur Evaluation 51.3 Lipid Disorders & ASCVD Risk-Based Statin Therapy

52 Chapter 52: Chronic Respiratory Diseases: Asthma & COPD

52.1 Chronic Asthma Management: GINA Stepwise SMART Therapy 52.2 Chronic Obstructive Pulmonary Disease: GOLD Recommendations 52.3 Solitary Pulmonary Nodule Evaluation & Fleischner Society Criteria

53 Chapter 53: Chronic Metabolic Diseases: Diabetes Mellitus

53.1 Type 2 Diabetes Management: ADA Pharmacotherapy Algorithms 53.2 Type 1 Diabetes: Basal-Bolus Insulin, CGMs & Diabetic Complications 53.3 Diabetic Microvascular & Macrovascular Disease Surveillance

54 Chapter 54: Obesity, Nutrition & Metabolic Bone Diseases

54.1 Medical & Behavioral Management of Obesity & Incretin Mimetics 54.2 Osteoporosis & Metabolic Bone Disease: DEXA, FRAX & Antiresorptives 54.3 Nutritional Deficiencies: Vitamin D, B12, Iron & Malnutrition

55 Chapter 55: Chronic Endocrine Disorders

55.1 Primary & Subclinical Hypothyroidism, Hyperthyroidism & Nodules 55.2 Adrenal Disorders: Addison's Disease & Cushing's Syndrome 55.3 Hypercalcemia, Hyperparathyroidism & Pituitary Disorders

56 Chapter 56: Chronic Kidney Disease & Venous Disorders

56.1 Chronic Kidney Disease: KDIGO Staging & Renoprotective Therapy 56.2 Chronic Venous Insufficiency, Stasis Dermatitis & Lymphedema 56.3 Chronic Electrolyte & Acid-Base Management in CKD

57 Chapter 57: Chronic Gastrointestinal & Hepatic Diseases

57.1 Gastroesophageal Reflux Disease, Barrett's Esophagus & Dyspepsia 57.2 Chronic Liver Disease: MASLD/NAFLD, Cirrhosis & Portal Hypertension 57.3 Viral Hepatitis B & C: Long-Term Monitoring & DAA Therapy

58 Chapter 58: Colorectal Surveillance & Chronic Pancreaticobiliary Care

58.1 Post-Polypectomy Colorectal Polyp Surveillance Guidelines 58.2 Chronic Pancreatitis & Exocrine Pancreatic Insufficiency 58.3 Chronic Nausea, Gastroparesis & Functional GI Disorders

59 Chapter 59: Chronic Musculoskeletal & Rheumatologic Disorders

59.1 Osteoarthritis: Hip, Knee & Hand Management 59.2 Spinal Conditions: Spinal Stenosis, Spondylolisthesis & Compression Fractures 59.3 Chronic Myopathies & Fibromyalgia Syndrome

60 Chapter 60: Chronic Neurologic & Neurodegenerative Disorders

60.1 Dementia: Alzheimer's, Vascular & Lewy Body Disease 60.2 Parkinson's Disease & Essential Tremor 60.3 Epilepsy: Chronic Antiseizure Medications & Post-Stroke Care

61 Chapter 61: Chronic Peripheral Nerves, Pain & Sensory Disorders

61.1 Diabetic & Chronic Peripheral Neuropathies 61.2 Chronic Pain Syndromes & Chronic Daily Headaches 61.3 Chronic Tinnitus, Presbycusis & Persistent Dizziness

62 Chapter 62: Chronic Psychiatric Disorders

62.1 Major Depressive Disorder & Generalized Anxiety Disorder 62.2 Bipolar Disorder: Maintenance Pharmacotherapy & Lithium Monitoring 62.3 Adult & Pediatric Attention-Deficit/Hyperactivity Disorder

63 Chapter 63: Chronic Behavioral Health & Neurodevelopmental Conditions

63.1 Chronic Behavioral Conditions: PTSD, OCD & Somatization 63.2 Autism Spectrum Disorder & Intellectual Disabilities 63.3 Eating Disorders: Anorexia Nervosa, Bulimia & Binge Eating

64 Chapter 64: Chronic Substance Use Disorders & Tobacco Cessation

64.1 Alcohol Use Disorder: Pharmacotherapy & Relapse Prevention 64.2 Opioid & Stimulant Use Disorders: MOUD & Harm Reduction 64.3 Longitudinal Tobacco Cessation Pharmacotherapy

65 Chapter 65: Chronic Dermatologic Conditions

65.1 Acne Vulgaris, Rosacea & Seborrheic Dermatitis 65.2 Chronic Plaque Psoriasis & Biologic Therapies 65.3 Chronic Eczema, Hidradenitis Suppurativa & Cutaneous Lupus

66 Chapter 66: Chronic Reproductive, Infectious & Geriatric Special Care

66.1 Chronic Menstrual Disorders, Infertility & Sexual Dysfunction 66.2 Menopause Management & Hormone Replacement Therapy 66.3 Chronic HIV Infection Management & Primary Care Integration 66.4 Gender-Affirming Primary Care & Hormone Therapy 66.5 Advance Care Planning, Palliative Care & End-of-Life Symptom Control

67 Chapter 67: Continuity Care: Sleep, Fatigue, Cancer, Pregnancy & the Adult Preventive Visit

67.1 Chronic Insomnia & Obstructive Sleep Apnea 67.2 Chronic Malaise, Fatigue & ME/CFS 67.3 Primary Care During Cancer Treatment & Survivorship 67.4 Routine Prenatal Care & Longitudinal Pregnancy Management 67.5 The Periodic Adult Health Examination & Medicare Annual Wellness Visit

22.1 Acute Ambulatory Fractures & Initial Splinting

Key Takeaways Explain This Topic AI

Distal neurovascular assessment—evaluating palpable peripheral pulses, capillary refill, two-point sensory discrimination, and motor function—is the mandatory initial physical examination priority in every musculoskeletal trauma patient and must be repeated immediately after any reduction or immobilization.

The radiographic rule of orthogonal views mandates a minimum of two perpendicular projections (anteroposterior and lateral) including the joint above and joint below; occult or non-displaced fractures with negative initial films but focal tenderness (e.g., anatomic snuffbox tenderness in scaphoid injury) dictate thumb spica splinting and repeat radiography in 10-14 days or urgent non-contrast MRI.

Open fractures require urgent classification via the Gustilo-Anderson system and immediate intravenous antibiotic prophylaxis within 3 hours (Type I/II: IV Cefazolin 2g q8h; Type III: add IV Gentamicin 5 mg/kg or Ceftriaxone; farm/soil contamination: add IV Penicillin G 4 million units q4h for Clostridium) alongside sterile saline dressing and emergent operative debridement within 12-24 hours.

The Ottawa Ankle and Foot Rules provide >98% sensitivity for clinically significant fractures: ankle radiographs are indicated only with bone tenderness at the posterior edge/tip of either malleolus or inability to bear weight for 4 steps; all ankle injuries mandate proximal fibular palpation to detect an occult Maisonneuve fracture.

Fifth metatarsal base fractures require strict anatomical differentiation: true Jones fractures (Zone 2 metaphyseal-diaphyseal junction in a hypovascular watershed) carry a 30-50% nonunion risk requiring strict non-weight-bearing cast immobilization for 6-8 weeks or surgical screw fixation, whereas pseudo-Jones tuberosity avulsion fractures (Zone 1) heal reliably with weight-bearing as tolerated in a stiff-soled shoe.

Last updated: September 2026

Systematic Fracture Assessment & Neurovascular Examination

Musculoskeletal trauma represents one of the most frequent reasons for acute presentations in family medicine, urgent care, and emergency settings. The primary objective during initial assessment is the rapid identification of limb-threatening or life-threatening pathology, systematic evaluation of soft tissue and neurovascular integrity, and appropriate temporary stabilization.

Neurovascular Examination: The Essential First Step

Prior to performing any manipulation, reduction, splinting, or obtaining radiographic studies, a detailed neurovascular assessment distal to the site of injury must be documented. Any subsequent manipulation or splint application mandates an immediate repeat neurovascular examination to ensure that reduction maneuvers or compressive wraps have not compromised neurovascular integrity.

Upper Extremity Neurovascular Examination :

Radial Nerve :

Motor Function : Active wrist extension against gravity/resistance and active extension of the fingers at the metacarpophalangeal (MCP) joints ("thumbs up" sign).

Sensory Territory : Dorsal first web space (dorsum of the hand between the first and second metacarpals).

Median Nerve :

Motor Function (Main Trunk) : Palmar abduction of the thumb against resistance (abductor pollicis brevis) and thumb-to-fifth-digit opposition.

Motor Function (Anterior Interosseous Nerve branch - AIN) : Distal flexion of the thumb interphalangeal (IP) joint and index finger distal interphalangeal (DIP) joint to form the classic "OK" sign (flexor pollicis longus and flexor digitorum profundus I/II).

Sensory Territory : Palmar aspect of the index finger distal pad and thumb pad.

Ulnar Nerve :

Motor Function : Finger abduction and adduction against resistance (dorsal and palmar interossei); thumb adduction (adductor pollicis; tested via Froment's sign, where compensatory IP joint flexion reveals adductor weakness).

Sensory Territory : Palmar and dorsal aspects of the distal fifth digit and hypothenar eminence.

Vascular Perfusion :

Palpation of radial and ulnar arterial pulses at the wrist; documentation of symmetrical volume.

Capillary refill time in each distal digit (normal <2 seconds).

Assessment of skin color, warmth, and distal digital turgor.

Lower Extremity Neurovascular Examination :

Femoral / Saphenous Nerve :

Motor Function : Active knee extension against resistance (quadriceps femoris).

Sensory Territory : Medial distal thigh, medial knee, and medial aspect of the lower leg/calf.

Common Peroneal (Fibular) Nerve :

Deep Peroneal Nerve : Active ankle dorsiflexion and active great toe extension against resistance (extensor hallucis longus); sensation over the first dorsal web space (between first and second toes).

Superficial Peroneal Nerve : Active ankle eversion (peroneus longus/brevis); sensation over the anterolateral lower leg and the broad dorsum of the foot.

Tibial Nerve :

Motor Function : Active ankle plantarflexion (gastrocnemius/soleus) and active flexion of the toes (flexor hallucis longus, flexor digitorum longus).

Sensory Territory : Plantar aspect of the foot, heel, and plantar digital pads.

Vascular Perfusion :

Palpation of the dorsalis pedis artery (dorsum of the foot between first and second metatarsals) and the posterior tibial artery (posterior and inferior to the medial malleolus).

Capillary refill of the digits (<2 seconds); continuous assessment of extremity warmth and Doppler ultrasound interrogation if pulses are non-palpable.

Assessment of Soft Tissues and Skin Integrity

Open vs. Closed Fracture : Every laceration, abrasion, or punctate skin break in proximity to an underlying fracture must be presumed an open fracture until proven otherwise. Even a microscopic 1 mm puncture created by a transiently protruding bone spike that subsequently retracted constitutes an open fracture with deep tissue contamination.

Skin Tenting & Impending Skin Necrosis : High-energy displacement of bony fragments can severely stretch and tent overlying skin. Tenting produces focal cutaneous ischemia manifested by blanching, extreme thinning, and loss of capillary refill. Unrelieved tenting progresses to full-thickness cutaneous necrosis within hours, converting a closed fracture into an open fracture. Immediate gentle closed longitudinal traction to disimpact the bone fragment and relieve cutaneous tension is mandatory.

Puckering Sign : Cutaneous puckering or dimpling indicates that bone ends or soft tissues are incarcerated within deep fascial planes or buttonholed through subcutaneous tissues, frequently heralding irreducible fractures that necessitate open operative reduction.

• Principles of Orthopedic Radiography
• The Rule of Orthogonal Views

Radiographic evaluation of acute skeletal trauma adheres to unyielding foundational tenets:

Minimum Two Perpendicular Projections :

A single radiographic view is completely inadequate and medically unacceptable ("one view is no view").

A standard minimum of two orthogonal projections at 90 degrees to each other —specifically Anteroposterior (AP) and True Lateral views—must be obtained for every suspected skeletal injury. An oblique or non-displaced fracture evident on a lateral view may be entirely invisible on an AP view.

Inclusion of the Joint Above and Joint Below :

Long bone radiographs (clavicle, humerus, radius/ulna, femur, tibia/fibula) must capture the full length of the diaphysis and encompass the joint immediately proximal and the joint immediately distal to the suspected fracture.

Failure to image adjacent joints leads to missed dislocations, associated partner fractures, and disruption of kinetic ring structures (e.g., missed radial head dislocation in a Monteggia fracture-dislocation; missed proximal fibular fracture in a Maisonneuve injury).

Specialized Oblique & Stress Views :

Complex anatomical structures require supplementary projections: scaphoid views for carpal trauma, mortise views (AP with 15-20 degrees of internal rotation) for the ankle, and axial calcaneal (Harris) views for hindfoot trauma.

Open Fracture Emergency Management: The Gustilo-Anderson Protocol

Open fractures represent true orthopedic emergencies characterized by direct communication between the external environment and the fracture hematoma, conferring high risks of osteomyelitis, nonunion, and limb loss.

Gustilo-Anderson Classification System

Gustilo Type Wound Dimensions Soft Tissue Damage & Contamination Bone Injury Characteristics Infection Rate

Type I <1 cm length Clean, minimal soft-tissue damage; typically inside-out puncture Simple, transverse, or minimal comminution 0% - 2%

Type II 1 cm to 10 cm Moderate soft-tissue damage; minimal periosteal stripping; moderate contamination Moderate comminution or displacement 2% - 7%

Type IIIA >10 cm length Extensive soft-tissue laceration/damage; high-energy mechanism; adequate periosteal/soft-tissue coverage of bone Severe comminution or segmental fracture pattern 5% - 10%

Type IIIB >10 cm length Extensive soft-tissue loss with periosteal stripping and exposed bare bone ; requires local or free flap coverage Massive comminution; high-energy trauma 10% - 25%

Type IIIC Any wound size Open fracture associated with vascular injury requiring arterial repair for limb salvage Any fracture pattern; severe ischemia 25% - 50%

Special Caveat : Any open fracture sustained in an agricultural setting, barnyard, soil-contaminated environment, or caused by high-velocity gunshot trauma is automatically classified as a Type III injury regardless of the physical dimensions of the cutaneous laceration.

Immediate Emergency Department Management Protocol

Time-to-Antibiotic Window (<3 Hours) :

Intravenous antibiotic administration within 3 hours of injury is the single most critical physician-dependent intervention to prevent acute and chronic osteomyelitis. A delay beyond 3 hours increases the infection rate by more than threefold.

Type I and Type II Fractures :

First-line: Cefazolin 2 g IV every 8 hours (weight-adjusted: 3 g IV if patient >120 kg).

Severe Beta-Lactam / Penicillin Allergy: Clindamycin 900 mg IV every 8 hours OR Vancomycin 15-20 mg/kg IV every 12 hours .

Type III Fractures :

Broaden coverage to encompass Gram-negative bacilli: Cefazolin 2 g IV every 8 hours PLUS Gentamicin 5 mg/kg IV once daily (or Ceftriaxone 2 g IV daily as a non-nephrotoxic alternative).

Farm, Soil, Barnyard, or Fecal Contamination :

High risk of spore-forming anaerobic infection ( Clostridium perfringens / gas gangrene).

ADD high-dose Penicillin G 4 million units IV every 4 hours (or Ampicillin-sulbactam 3 g IV every 6 hours).

Marine / Freshwater Contamination :

High risk of Vibrio vulnificus or Aeromonas hydrophila .

Add Doxycycline 100 mg IV BID PLUS Ceftazidime 2 g IV q8h or a fluoroquinolone.

Tetanus Prophylaxis :

If the patient has received ≥3 lifetime doses of tetanus toxoid: administer Tdap or Td intramuscularly if the last booster was >5 years ago for dirty/open wounds (>10 years for clean minor wounds).

If the patient has received <3 lifetime doses or immunization history is unknown/uncertain: administer Tdap 0.5 mL IM PLUS Tetanus Immune Globulin (TIG) 250 units IM at separate anatomical injection sites using separate syringes.

Local Wound Management & Splinting :

Remove gross superficial debris (twigs, gravel, clothing) from the surface.

DO NOT perform blind deep wound probing, local exploration, or aggressive forceful scrubbing in the emergency room.

DO NOT push protruding, contaminated bone ends back into the deep wound bed; if reduction maneuvers cause protruding bone to retract, explicitly notify the operating orthopedic surgeon.

Irrigate superficial debris gently with sterile isotonic saline; apply a sterile, saline-moistened gauze dressing covered with a dry sterile wrap.

Apply a rigid, non-circumferential stabilizing splint.

Emergent Orthopedic Consultation :

Urgent transfer to the operating theater for formal surgical irrigation and debridement under general anesthesia, ideally within 12 to 24 hours of injury.

Upper Extremity Ambulatory Fractures & Splinting Techniques UPPER EXTREMITY FRACTURE OVERVIEW

• ┌───────────────────────┐ ┌───────────────────────┐ ┌───────────────────────┐
• │ CLAVICLE FRACTURE │ │ DISTAL RADIUS (COLLES)│ │ SCAPHOID FRACTURE │
• ├───────────────────────┤ ├───────────────────────┤ ├───────────────────────┤
• │ • Middle third: 80% │ │ • Dorsal displacement │ │ • Anatomical snuffbox │
• │ • Sling immobilization│ │ • "Dinner fork" deform│ │ • Retrograde blood │
• │ • Surgery: >2cm short,│ │ • Sugar-tong splint │ │ • High AVN risk │
• │ tenting, neurovasc │ │ • Hematoma block 10mL │ │ • Thumb spica splint │
• └───────────────────────┘ └───────────────────────┘ └───────────────────────┘
• 1. Clavicle Fractures

Epidemiology & Anatomy : Represents 2% to 5% of all adult fractures. Anatomically divided into:

Middle Third (Midshaft) : Accounts for 80% of all clavicle fractures. Result of direct lateral shoulder impact.

Distal Third (Lateral) : Accounts for 15% . Often involves coracoclavicular (CC) ligament disruption.

Proximal Third (Medial) : Accounts for 5% . Requires high energy; evaluate for mediastinal vascular injury.

Physical Examination : Visible deformity, localized bony tenderness, crepitus, and ecchymosis. Careful assessment of the subclavian vessels (radial pulses) and brachial plexus is mandatory. Palpate for subcutaneous air or respiratory distress indicating associated pneumothorax.

Conservative Management :

Standard treatment for non-displaced or minimally displaced midshaft fractures is conservative immobilization using a simple arm sling (or sling and swathe).

Board Pearl : Randomized trials demonstrate that figure-of-eight bandages provide no improvement in alignment, healing rates, or functional outcomes compared to a simple sling, but cause significantly higher rates of axillary skin breakdown, pressure sores, and transient paresthesias. Simple sling immobilization for 3 to 4 weeks, followed by progressive active-assisted range of motion, is the evidence-based gold standard.

Indications for Urgent Orthopedic Surgical Referral (ORIF) :

• Open fracture or impending open fracture manifested by severe skin tenting and blanching;
• Concurrent neurovascular compromise (subclavian artery/vein compression, brachial plexus palsy);

Complete displacement with shortening >2 cm (associated with high nonunion rates [up to 15-20%] and permanent shoulder girdle dysfunction);

100% cortical displacement without bony contact in an active individual;

Floating shoulder (ipsilateral clavicle midshaft fracture and scapular neck fracture yielding an unstable glenoid fragment);

Symptomatic nonunion after 12 to 16 weeks of conservative therapy.

2. Distal Radius Fractures: Colles versus Smith

Distal radius fractures are the most common fractures of the upper extremity, typically occurring secondary to a fall onto an outstretched hand (FOOSH). DISTAL RADIUS DEFORMITY COMPARISON

• COLLES FRACTURE SMITH FRACTURE
• (Fall on Outstretched Hand) (Fall on Flexed Wrist)

• Dorsal Displacement Volar Displacement
• "Dinner Fork" "Garden Spade"
• ┌───────┐ ┌───────┐
• │ Hand │ │ Hand │
• ────┘ │ ────┼───────┘
• │ │
• Forearm │ │ Forearm
• ─────────────┘ └─────────────

Colles Fracture :

Mechanism : FOOSH with the wrist positioned in pronounced dorsiflexion/extension.

Deformity : Extra-articular metaphyseal fracture with dorsal displacement , dorsal angulation (loss of normal 11-degree volar tilt), and radial shortening. Produces the classic "dinner fork" deformity .

Smith Fracture ("Reverse Colles") :

Mechanism : Fall onto a hyperflexed wrist or direct high-energy impact to the dorsal forearm.

Deformity : Extra-articular fracture with volar (palmar) displacement and volar angulation of the distal radial fragment. Produces the "garden spade" deformity .

Significance : Inherently unstable due to dynamic flexor tendon pull; frequently requires operative fixation.

Barton Fracture :

Fracture-dislocation of the radiocarpal joint with intra-articular shear involvement of either the dorsal or volar rim of the distal radius. Highly unstable; universally requires operative intervention.

Hematoma Block Technique

Providing effective bedside analgesia is required prior to attempting closed reduction of distal radius fractures:

Prepare the dorsal skin over the fracture site with chlorhexidine or povidone-iodine in a sterile fashion.

Palpate the dorsal step-off or depression corresponding to the fracture line.

Using a 20- to 22-gauge 1.5-inch needle attached to a 10-12 mL syringe containing 10 mL of 1% lidocaine without epinephrine , insert the needle directly into the fracture gap from the dorsal aspect.

Aspirate dark venous fracture hematoma blood to definitively confirm intra-hematoma positioning.

Slowly inject 8 to 10 mL of lidocaine into the fracture hematoma; resistance should be minimal. Allow 10 to 15 minutes for complete regional anesthesia to take effect.

Closed Reduction Technique for Colles Fracture

Place the patient supine. Apply sustained axial traction across the hand and thumb (or utilize finger traps with 10-15 lbs of counter-traction at the elbow flexed at 90 degrees) for 5 minutes to overcome muscle spasm and restore length.

Disimpact the fragments by briefly accentuating the dorsal deformity.

Apply strong, directed palmar pressure over the distal fragment while applying counter-pressure on the proximal radial shaft, mobilizing the wrist into palmar flexion, ulnar deviation, and pronation .

Splint Application: The Sugar-Tong Splint

Distal radius fractures must be immobilized in a Sugar-Tong Splint (not a simple volar splint, which allows pronation/supination).

Splint Construction : Plaster or fiberglass (8-10 layers of 3- or 4-inch material) extends from the dorsal metacarpal heads, courses proximally along the dorsal forearm, wraps securely around the posterior elbow, and extends along the volar forearm to terminate at the distal palmar crease.

Position of Function : The wrist is maintained in slight flexion (10-15 degrees) and slight ulnar deviation. Avoid extreme palmar flexion ("Cotton-Loder position"), which produces median nerve compression in the carpal tunnel.

Critical Warning : Never apply a circumferential plaster or fiberglass cast acutely . Post-traumatic soft tissue swelling within a rigid circumferential cast dramatically increases intracompartmental pressures, causing acute compartment syndrome of the forearm.

3. Scaphoid Fractures

Anatomy & Unique Vascular Supply :

The scaphoid (navicular) is the most frequently fractured carpal bone (~70% of carpal injuries).

Blood supply to the scaphoid is uniquely precarious: branches of the radial artery enter the bone via the distal pole and waist in a retrograde intraosseous fashion to supply the proximal pole.

Consequently, fractures through the scaphoid waist or proximal pole deprive the proximal fragment of arterial inflow, resulting in high rates of avascular necrosis (AVN) of the proximal pole (seen in up to 30-40% of waist fractures and >90% of proximal pole fractures), delayed union, nonunion, and post-traumatic arthritis (scaphoid nonunion advanced collapse [SNAC] wrist). SCAPHOID VASCULAR VULNERABILITY

• Radial Artery Inflow
• │
• ▼
• ┌───────────────────┐
• │ Distal Pole │ ◄── Rich Blood Supply
• ├───────────────────┤
• │ Scaphoid Waist │ ◄── Most Common Fracture (70%)
• ├───────────────────┤
• │ Proximal Pole │ ◄── ISOLATED FROM ARTERIAL INFLOW

└───────────────────┘ High Risk of AVN & Nonunion!

• ▲
• (Retrograde Flow Lost)

Mechanism of Injury : FOOSH with impact concentrated on the thenar eminence.

Clinical Examination Triad :

Anatomical Snuffbox Tenderness : Tenderness to palpation in the triangular depression bordered by the extensor pollicis longus (EPL) tendon medially and the extensor pollicis brevis (EPB) and abductor pollicis longus (APL) tendons laterally (sensitivity ~90%, but lower specificity);

Scaphoid Tubercle Tenderness : Tenderness elicited on the volar wrist at the base of the thenar eminence;

Axial Thumb Compression Pain : Pain elicited by compressing the first metacarpal longitudinally into the scaphoid.

Radiographic Limitations & Clinical Management Protocol :

Standard wrist radiographs including dedicated scaphoid views (PA with ulnar deviation, lateral, semi-pronated oblique, and semi-supinated oblique) fail to detect 15% to 20% of acute scaphoid fractures on initial evaluation.

The Golden Scaphoid Management Rule :

If a patient presents with traumatic wrist pain and clinical tenderness in the anatomical snuffbox or scaphoid tubercle, they must be managed as a presumed scaphoid fracture regardless of negative initial radiographs .

Immobilize the wrist and thumb in a Short-Arm Thumb Spica Splint .

Instruct the patient to remain strictly non-weight-bearing with the wrist and schedule repeat clinical examination and plain radiographs in 10 to 14 days (when osteoclastic resorption along the fracture line renders occult fractures radiographically visible).

Alternative Modern Strategy : Obtain an immediate non-contrast MRI of the wrist (or high-resolution thin-cut wrist CT), which demonstrates 100% sensitivity and specificity, eliminates 2 weeks of unnecessary immobilization in patients without fracture, and detects alternative ligamentous or carpal injuries.

4. Boxer's Fracture (5th Metacarpal Neck)

Pathomechanics : Fracture of the neck of the fifth (or fourth) metacarpal, characteristically sustained when striking a solid object with a clenched fist.

Physical Examination :

Dorsal soft tissue swelling, loss of knuckle prominence, and point tenderness over the fifth metacarpal neck.

Rotational Alignment Assessment : The single most critical physical examination step. In normal anatomical alignment, when the MCP and IP joints are flexed into a fist, the axes of all four fingers point toward a single reference landmark: the scaphoid tubercle . Any rotational malalignment results in finger overlap ("scissoring") during flexion, severely impairing grip function. Even 2 to 5 degrees of rotational deformity is functionally unacceptable and warrants closed reduction or surgical correction.

Acceptable Dorsal Angulation Guidelines :

Due to the high mobility and compensatory sagittal plane motion of the fifth carpometacarpal (CMC) joint (approximately 20-30 degrees of motion), the fifth metacarpal neck tolerates substantial dorsal angulation without permanent functional deficit.

Acceptable Dorsal Angulation Thresholds :

5th Metacarpal Neck : Up to 30 to 40 degrees (some authorities permit up to 45-50 degrees) of dorsal angulation is acceptable conservatively, provided there is zero rotational deformity.

4th Metacarpal Neck : Tolerates up to 20 degrees .

2nd and 3rd Metacarpal Necks : The index and middle CMC joints are rigid, fixed joints with zero compensatory motion; they tolerate <10 to 15 degrees of angulation; higher angulation requires anatomical reduction.

Closed Reduction (The Jahss Maneuver) :

Perform an ulnar nerve block or local hematoma block.

Flex both the MCP joint and proximal interphalangeal (PIP) joint to 90 degrees .

Apply upward dorsal pressure along the shaft of the proximal phalanx while stabilizing and pushing downward on the metacarpal shaft. The tightened collateral ligaments of the flexed MCP joint transmit upward force to reduce the volarly displaced metacarpal head.

Splinting: The Ulnar Gutter Splint :

Plaster or fiberglass extends along the ulnar forearm, wrist, and 4th and 5th digits.

The Intrinsic-Plus ("Safe") Position :

Wrist in 20 to 30 degrees of extension ;

MCP joints flexed to 70 to 90 degrees (keeps collateral ligaments at maximal length, preventing joint contractures and stiffness);

Interphalangeal (PIP and DIP) joints in near-full extension (0 to 10 degrees).

The Human Bite Wound ("Fight Bite") Warning :

Any skin break, laceration, or puncture over the dorsal MCP joint following a fist fight must be managed as an open human bite wound contaminated with oral flora ( Eikenella corrodens , Staphylococcus aureus , Streptococcus , and anaerobes).

The tooth punctures the extensor tendon and joint capsule while the fist is clenched; when the fingers extend, the puncture tracks retract beneath intact skin, locking virulent bacteria into the joint.

Never close these wounds primarily . Irrigate copiously, leave open, obtain radiographs to rule out foreign tooth fragments or cortical fracture, and prescribe Amoxicillin-clavulanate 875/125 mg PO BID (or IV Ampicillin-sulbactam 1.5-3.0 g q6h if infected) with 24-hour follow-up.

• Lower Extremity Ambulatory Fractures: Ankle & 5th Metatarsal
• 1. The Ottawa Ankle and Foot Rules

The Ottawa Ankle and Foot Rules are validated decision instruments demonstrating near 100% sensitivity for identifying clinically significant fractures, reducing unnecessary radiographs by 30% to 40%. THE OTTAWA ANKLE & FOOT RULES

• ANKLE RADIOGRAPHIC SERIES FOOT RADIOGRAPHIC SERIES
• (Indicated if pain in malleolar (Indicated if pain in midfoot
• zone PLUS any of the following) zone PLUS any of the following)
• ┌────────────────────────────────────────┐ ┌────────────────────────────────────────┐
• │ 1. Bone tenderness along distal 6 cm │ │ 1. Bone tenderness at the base of the │
• │ of posterior edge or tip of the │ │ fifth metatarsal; OR │
• │ LATERAL malleolus; OR │ │ │
• │ 2. Bone tenderness along distal 6 cm │ │ 2. Bone tenderness at the NAVICULAR │
• │ of posterior edge or tip of the │ │ bone; OR │
• │ MEDIAL malleolus; OR │ │ │
• │ 3. Inability to bear weight both │ │ 3. Inability to bear weight both │
• │ immediately after injury AND in │ │ immediately after injury AND in │
• │ the clinic/ED (for 4 steps). │ │ the clinic/ED (for 4 steps). │
• └────────────────────────────────────────┘ └────────────────────────────────────────┘

Exclusion Criteria : The rules do not apply to patients under 18 years of age (though pediatric Ottawa rules exist), patients with altered mental status, intoxicating substances, distracting injuries, diminished lower extremity sensation (diabetic neuropathy), or presenting >10 days after the initial trauma.

2. Ankle Fractures & The Danis-Weber Classification

The stability of ankle fractures depends upon the integrity of the ankle mortise, comprised of the medial malleolus (and deltoid ligament), lateral malleolus (distal fibula), and the syndesmotic ligament complex (anterior inferior tibiofibular ligament, posterior inferior tibiofibular ligament, and interosseous ligament). DANIS-WEBER ANKLE FRACTURE CLASSIFICATION

• WEBER A WEBER B WEBER C
• (Infrasyndesmotic) (Transsyndesmotic) (Suprasyndesmotic)

• │ │ │ │ │ * │ ◄── Fracture above joint
• │ │ │ │ ├─────────┤ Syndesmosis TORN
• ├─────────┤ │ * │ ◄── Level of │ │ UNSTABLE -> ORIF
• │ │ ├─────────┤ plafond │ │
• │ * │ ◄── Below joint │ │ │ │
• ═══╧═════════╧═══ ═══╧═════════╧═══ ═══╧═════════╧═══
• Syndesmosis INTACT 50% Syndesmosis Injured Syndesmosis DISRUPTED
• STABLE -> Boot Evaluate Medial Clear Space UNSTABLE -> Operative

Weber Type A (Infrasyndesmotic) :

Fibular fracture line is strictly below the level of the tibial plafond .

The syndesmotic ligament complex and deltoid ligament are completely intact.

The ankle mortise remains stable. Managed conservatively with a short-leg walking boot or cast with weight-bearing as tolerated for 4 to 6 weeks.

Weber Type B (Transsyndesmotic) :

Fibular fracture begins at the level of the tibial plafond and extends obliquely upward.

The tibiofibular syndesmosis is partially compromised (injured in ~50% of cases).

Stability Determination : Assess the medial ankle structures. If the medial malleolus is intact, there is no medial tenderness or hematoma, and the medial clear space on the mortise radiograph is ≤4 mm , the fracture is stable and can be treated conservatively. If there is medial tenderness, ecchymosis, or the medial clear space is widened (>4 mm, indicating complete deltoid ligament tear), the fracture is unstable and requires operative ORIF.

Weber Type C (Suprasyndesmotic) :

Fibular fracture is above the level of the tibial plafond .

The tibiofibular syndesmotic complex and interosseous membrane are completely disrupted up to the level of the fibular fracture.

The fracture is inherently unstable ; widens the ankle mortise and requires open reduction and internal fixation (ORIF) with syndesmotic screw or suture-button fixation.

3. The Maisonneuve Fracture: A Classic Diagnostic Pitfall

Pathoanatomy : A spiral fracture of the proximal third or neck of the fibula associated with disruption of the distal tibiofibular syndesmosis, tearing of the entire interosseous membrane, and either an avulsion fracture of the medial malleolus or a complete rupture of the deep deltoid ligament .

The Clinical Trap :

The patient presents following an external rotation ankle injury complaining exclusively of severe medial ankle pain and swelling. Initial plain ankle radiographs may reveal only an isolated medial malleolus fracture or, even more deceptively, no fracture at all , displaying only widening of the medial clear space (>4 mm) or tibiofibular overlap <6 mm.

If the clinician fails to examine the entire lower leg, the high proximal fibular fracture will be missed, leading to unrecognized syndesmotic diastasis, chronic ankle instability, and early debilitating osteoarthritis.

The Mandated Clinical Rule :

Palpate the proximal fibular head and entire fibular shaft in EVERY patient presenting with an acute ankle injury.

If tenderness is present at the proximal fibula, or if ankle radiographs show medial clear space widening without a distal fibular fracture, obtain full-length AP and Lateral Tibia/Fibula radiographs immediately.

Maisonneuve fractures are inherently unstable Weber C injuries that universally require surgical fixation.

4. Fifth Metatarsal Base Fractures: Zones 1, 2, and 3

Fractures of the base of the fifth metatarsal represent the most frequent foot fractures, but their management diverges drastically based on precise anatomical vascular zones: FIFTH METATARSAL BASE FRACTURE ZONES

• Toes / Distal Phalanges
• ▲
• │
• ┌──────────────────────────────┴──────────────────────────────┐
• │ Metatarsal Diaphysis │
• ├─────────────────────────────────────────────────────────────┤
• │ ZONE 3: Diaphyseal Stress Fracture │ ◄── Distal to 4-5 Articulation
• │ Chronic repetitive stress; intramedullary screw │
• ├─────────────────────────────────────────────────────────────┤
• │ ZONE 2: True Jones Fracture │ ◄── Metaphyseal-Diaphyseal Junction
• │ Watershed zone; 30-50% nonunion; strict NWB cast │ Involves 4th-5th intermetatarsal joint
• ├─────────────────────────────────────────────────────────────┤
• │ ZONE 1: Pseudo-Jones / Tuberosity Avulsion Fracture │ ◄── Proximal Tuberosity / Apophysis
• │ Peroneus brevis / plantar fascia; WB boot / shoe │
• └─────────────────────────────────────────────────────────────┘

Zone 1: Tuberosity Avulsion Fracture ("Pseudo-Jones") :

Anatomy : Avulsion of the cortical tuberosity (styloid process) at the proximal tip of the metatarsal base. Caused by sudden inversion of a plantarflexed foot with avulsion by the lateral cord of the plantar aponeurosis or the peroneus brevis tendon.

Vascularity & Prognosis : The tuberosity enjoys an abundant vascular network supplied by cancellous metaphyseal bone. Nonunion is exceedingly rare (<1%).

Management : Conservative, symptomatic management with weight-bearing as tolerated in a stiff-soled shoe, rigid post-op shoe, or removable walking boot for 3 to 4 weeks. Progression to regular footwear as pain allows.

Zone 2: True Jones Fracture :

Anatomy : A transverse fracture located at the metaphyseal-diaphyseal junction , situated approximately 1.5 to 3 cm distal to the proximal tuberosity tip. The fracture line extends into the fourth and fifth intermetatarsal articulation .

Pathophysiology : This anatomical region represents an extreme hypovascular watershed zone supplied only by an intraosseous nutrient artery entering mid-shaft that arborizes retrograde. Fractures disrupt this tenuous intraosseous inflow, resulting in very high rates of delayed union (30% to 50%) and persistent nonunion .

Management :

Non-Operative : Strict non-weight-bearing (NWB) short-leg cast for 6 to 8 weeks (up to 12 weeks), verified by radiographic evidence of bridging callus before initiating protected weight-bearing.

Operative : Percutaneous intramedullary screw fixation is strongly recommended as first-line therapy for competitive athletes, high-demand laborers, or displaced fractures to achieve rapid union and minimize recurrence.

Zone 3: Proximal Diaphyseal Stress Fracture :

Located distal to the fourth-fifth intermetatarsal articulation within the proximal 1.5 cm of the diaphysis. Result of chronic repetitive microtrauma (often seen in military recruits, runners, or basketball players with cavovarus foot alignment).

Radiographs characteristically demonstrate cortical thickening, periosteal reaction, and medullary canal narrowing. High failure rates with conservative casting; frequently requires intramedullary screw fixation with or without bone grafting.

Loading diagram... Clinical Triage and Splinting Algorithm for Acute Ambulatory Fractures