Study guide
7.1 Pediatric Musculoskeletal Injuries & Fractures
BCEN CPEN Certified Pediatric Emergency Nurse Exam
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1 Chapter 1: Exam Overview, Triage Process & Initial Emergency Assessment
1.1 CPEN Exam Logistics, Blueprint & Certification Overview 1.2 Pediatric Triage Systems & Acuity Categorization 1.3 Pediatric Assessment Triangle (PAT) & Initial Impression 1.4 Primary & Secondary Pediatric Emergency Assessment 1.5 Age-Specific Vital Signs, Developmental Considerations & Pain Scales
2 Chapter 2: Pediatric Respiratory Emergencies
2.1 Upper Airway Obstruction 2.2 Lower Airway Emergencies 2.3 Respiratory Distress vs. Respiratory Failure & Airway Management
3 Chapter 3: Pediatric Cardiovascular Emergencies
3.1 Pediatric Dysrhythmias & ECG Analysis 3.2 Congenital Heart Defects 3.3 Acquired Heart Disease & Heart Failure
4 Chapter 4: Pediatric Neurological Emergencies
4.1 Pediatric Seizures, Status Epilepticus & Febrile Seizures 4.2 Altered Mental Status, Increased ICP & Head Trauma 4.3 Pediatric Central Nervous System Infections
5 Chapter 5: Pediatric Gastrointestinal & Genitourinary Emergencies
5.1 Pediatric GI Surgical Emergencies 5.2 Pediatric Dehydration, Gastroenteritis & Fluid Resuscitation Protocols 5.3 Pediatric GU & Renal Emergencies
6 Chapter 6: Pediatric Endocrine, Metabolic & Hematologic/Oncologic Emergencies
6.1 Diabetic Ketoacidosis (DKA) & Hypoglycemia in Pediatric Emergency Patients 6.2 Electrolyte Imbalances & Inborn Errors of Metabolism 6.3 Sickle Cell Disease Crisis & Pediatric Oncologic Emergencies
7 Chapter 7: Pediatric Musculoskeletal, Integumentary & ENT/Ophthalmic Emergencies
7.1 Pediatric Musculoskeletal Injuries & Fractures 7.2 Pediatric Dermatologic Emergencies & Rashes 7.3 Pediatric ENT & Ocular Emergencies
8 Chapter 8: Pediatric Trauma Emergencies
8.1 Pediatric Trauma Resuscitation & Anatomical Vulnerabilities 8.2 Head, Spinal & Thoracic Trauma in Children 8.3 Abdominal, Pelvic & Extremity Trauma in Pediatric Patients
9 Chapter 9: Child Maltreatment, Toxicology & Behavioral Emergencies
9.1 Child Abuse, Neglect, Non-Accidental Trauma & Mandatory Reporting 9.2 Pediatric Toxicology, Toxidromes & Emergency Antidotes 9.3 Pediatric Behavioral & Mental Health Crisis Management
10 Chapter 10: Pediatric Multi-System Emergencies, Shock & Thermal Injuries
10.1 Pediatric Shock Recognition & Classification 10.2 Pediatric Sepsis, Septic Shock & Multiple Organ Dysfunction Syndrome 10.3 Pediatric Anaphylaxis & Severe Allergic Reactions 10.4 Submersion Injuries, Drowning & Thermal/Burn Emergencies
11 Chapter 11: Professional Practice, Legal, Ethical & Safety Standards
11.1 Legal & Ethical Considerations 11.2 Patient Safety, Medication Error Prevention & Weight-Based Dosing 11.3 Family-Centered Care, Communication & Disaster/Surge Preparedness
7.1 Pediatric Musculoskeletal Injuries & Fractures
Key Takeaways Explain This Topic AI
Salter-Harris Type II is the most common physeal injury, while Type V involves axial compression with a high risk of premature growth arrest.
Pain out of proportion to the injury and severe pain with passive stretching of affected muscles are the earliest and most sensitive indicators of compartment syndrome.
Nursemaid's elbow (radial head subluxation) occurs when the annular ligament slips over the radial head; it is reduced using hyperpronation or supination-flexion maneuvers.
The Kocher criteria differentiate septic arthritis (a surgical emergency requiring immediate joint arthrocentesis and debridement) from toxic synovitis (a benign, self-limiting post-viral condition).
Last updated: July 2026
7.1 Pediatric Musculoskeletal Injuries & Fractures
Pediatric musculoskeletal emergencies represent a significant portion of emergency department visits. Children possess unique skeletal anatomy and physiology that distinguish their fracture patterns, healing capabilities, and injury risks from adults. Understanding pediatric bone growth dynamics, physeal (growth plate) anatomy, acute neurovascular compromise, and joint infection clinical decision rules is essential for the Certified Pediatric Emergency Nurse (CPEN).
Pediatric Skeletal Anatomy & Physiology
Pediatric bones differ fundamentally from adult bones in several physiological aspects:
Physis (Growth Plate): The cartilaginous zone near the ends of long bones responsible for longitudinal growth. The physis is the weakest link in the pediatric skeleton, making it more vulnerable to shear and avulsion forces than adjacent dense ligaments.
Thick, Active Periosteum: The periosteum in children is thick, highly vascularized, and loosely attached to the diaphysis. This surrounding sheath provides rapid fracture healing, substantial remodeling potential, and often maintains alignment even when cortical bone is disrupted.
Increased Collagen and Lower Mineral Density: Pediatric bone is more porous and flexible, allowing it to bend and absorb energy before breaking completely. This elasticity leads to unique incomplete fracture patterns such as greenstick and torus fractures.
Salter-Harris Fracture Classification
Physeal injuries are classified using the Salter-Harris system (Types I through V). This system aids emergency nurses and orthopedic specialists in predicting the risk of growth arrest and angular limb deformities.
Salter-Harris Type Description & Anatomical Involvement Frequency Clinical Significance & Management
Type I (Straight across) Transverse fracture through the physis (growth plate) only; separates epiphysis from metaphysis. ~5% X-rays may appear normal; diagnosed clinically by localized point tenderness over the physis. Excellent prognosis. Immobilized with splint.
Type II (Above physis) Fracture through physis extending upward into the metaphysis (spares epiphysis). Includes a triangular metaphyseal fragment (Thurston-Holland sign). ~75% Most common Salter-Harris fracture. Excellent growth prognosis following closed reduction and immobilization.
Type III (Lower than physis) Fracture through physis extending downward into the epiphysis into the joint space. ~10% Intra-articular fracture requiring precise anatomic reduction (often open reduction) to prevent joint incongruity and growth arrest.
Type IV (Through all) Fracture passing through metaphysis, physis, and epiphysis. ~10% Intra-articular injury with high risk of growth plate bridging and permanent deformity. Requires anatomic reduction and orthopedic surgical fixation.
Type V (Rammed/Crushed) Severe axial compression/crushing injury to the physis without displacement. <1% Worst prognosis; initial radiographs often appear deceptively normal. High incidence of premature growth plate arrest and limb length discrepancy.
Mnemonic: SALTR — S traight across (I), A bove physis (II), L ower (III), T hrough (IV), R ammed/Crushed (V).
Pediatric Incomplete Fractures: Greenstick vs. Torus
Because of the high collagen content and flexible matrix of pediatric bone, incomplete fractures are extremely common in infants and young children.
Greenstick Fractures
A greenstick fracture occurs when a bending force causes a break in the cortex on the tension side (convex side) of the bone while the cortex on the compression side (concave side) remains intact but bent.
Clinical Presentation: Pain, localized swelling, deformity, and reduced movement of the affected extremity (most commonly the radius or ulna).
Management: Requires reduction to correct angular deformity, followed by immobilization in a long-arm or long-leg cast.
Torus (Buckle) Fractures
A torus fracture results from axial loading or compression forces (such as a fall on an outstretched hand [FOOSH]) that cause the cortex to buckle or wrinkle without complete disruption of either side.
Clinical Presentation: Mild localized pain, minimal swelling, and point tenderness without overt deformity.
Management: Torus fractures are inherently stable. They heal rapidly and are typically managed with a removable wrist splint or short cast for 3 to 4 weeks.
Compartment Syndrome in Pediatric Patients
Compartment syndrome is an orthopedic emergency resulting from increased tissue pressure within a closed fascial space, leading to microvascular compromise, tissue hypoxia, nerve damage, and irreversible muscle necrosis. In children, supracondylar humerus fractures and tibia shaft fractures pose the highest risk.
The 6 Ps of Compartment Syndrome
Pain out of proportion to the injury and pain with passive stretching of affected muscles ( Earliest and most reliable clinical indicators ).
Paresthesia (numbness, tingling, or sensory loss in distal nerve distribution).
Pallor (pale, cool extremity with prolonged capillary refill).
Poikilothermia (temperature equalizing to ambient environment).
Pulselessness (absent distal pulses; a late and ominous finding).
Paralysis (inability to move distal digits; indicates advanced neuromuscular death).
Clinical Warning: In infants and young non-verbal children, classic reporting of pain is impossible. Emergency nurses must look for increased anxiety, agitation, escalating analgesic requirements, and uncontrollable crying despite appropriate opioid administration.
Emergency Nursing Interventions
Position the affected extremity at heart level (do NOT elevate above heart level, as elevation reduces arterial perfusion pressure; do NOT place in dependent position, as it increases venous pressure).
Immediately remove or split all circumferential casts, splints, and dressings down to the bare skin.
Notify the orthopedic surgeon immediately for urgent compartment pressure measurement (pressures within 30 mmHg of diastolic blood pressure indicate ischemia) and emergency fasciotomy .
Nursemaid’s Elbow (Radial Head Subluxation)
Nursemaid’s elbow is the most common musculoskeletal injury in children aged 1 to 4 years. It occurs when sudden axial traction is applied to an extended, pronated arm—such as pulling a child up by the wrist or swinging a child by their hands.
Pathophysiology & Clinical Features
The sudden pull slips the immature annular ligament over the head of the radius, where it becomes trapped in the radiohumeral joint.
Presentation: The child holds the affected arm flexed at the elbow and pronated across the abdomen. The child refuses to use the arm and cries if movement is attempted. Localized tenderness, swelling, ecchymosis, and deformity are absent.
Reduction Techniques
Hyperpronation Technique: The clinician supports the child's elbow, places a thumb over the radial head, and firmly hyperpronates the forearm. A subtle "click" or "pop" is palpated at the radial head. This technique boasts a higher first-attempt success rate than supination.
Supination-Flexion Technique: The clinician supinates the forearm while applying pressure over the radial head, then fully flexes the elbow toward the shoulder.
Within 5 to 30 minutes following successful reduction, the child begins using the arm normally without pain. Radiographs are unnecessary unless there is focal swelling, tenderness, or a history of direct trauma.
Septic Arthritis vs. Toxic Synovitis
Differentiating septic arthritis (bacterial infection of the joint space) from toxic synovitis (transient, self-limiting post-viral inflammatory arthritis) is a critical diagnostic challenge in pediatric emergency care, most frequently presenting as acute hip pain or limping.
Diagnostic Feature Septic Arthritis Toxic Synovitis (Transient Synovitis)
Etiology Bacterial infection ( Staphylococcus aureus , Group A Streptococcus , Streptococcus pneumoniae ). Post-viral non-bacterial inflammatory response.
Clinical Onset Acute, rapid onset; severe pain, toxic appearance. Gradual onset; mild to moderate discomfort; non-toxic.
Weight-Bearing Complete refusal to bear weight; severe pseudoparalysis. Able to bear weight, though limping is present.
Systemic Signs High fever (> 38.5°C / 101.3°F), irritability, tachycardia. Afebrile or low-grade fever (< 38.0°C / 100.4°F).
Joint Mobility Joint held in flexion/abduction; severe pain with any motion. Mild restriction of internal rotation and abduction.
Emergency Plan Medical emergency. Arthrocentesis, urgent surgical drainage, IV antibiotics. Outpatient supportive care, NSAIDs, rest, close follow-up.
The Kocher Criteria for Septic Arthritis of the Hip
The Kocher criteria utilize four clinical and laboratory variables to predict the probability of septic arthritis in a child presenting with a painful hip:
Non-weight-bearing on the affected side.
Fever > 38.5°C (101.3°F) .
Erythrocyte Sedimentation Rate (ESR) > 40 mm/hr .
Serum White Blood Cell (WBC) count > 12,000 /mcL .
Probability of Septic Arthritis:
- 1 Criterion: ~3% risk
- 2 Criteria: ~40% risk
- 3 Criteria: ~93% risk
- 4 Criteria: >99% risk
(Note: Serum C-reactive protein [CRP] > 20 mg/L is frequently used as a 5th independent predictor to increase sensitivity.)
Emergency management of suspected septic arthritis requires immediate ultrasound-guided arthrocentesis for synovial fluid Gram stain and culture before administering broad-spectrum intravenous antibiotics, followed by surgical irrigation and debridement to prevent permanent cartilage destruction and ischemic necrosis of the femoral head.