Study guide
Musculoskeletal Disorders: Osteoarthritis, Osteoporosis, Gout & Back Pain
AANPCB Adult-Gerontology Primary Care Nurse Practitioner A-GNP
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1 Exam Structure, APRN Foundations & Geriatric Assessment
A-GNP Exam Logistics, Blueprint & Scoring Structure APRN Scope of Practice, Consensus Model & Interprofessional Collaboration Comprehensive Health History & Subjective Assessment Across Adult Lifespan Comprehensive Physical Examination & Clinical Assessment Skills
2 Health Assessment, Diagnostic Reasoning & Clinical Procedures
Diagnostic Reasoning, Test Interpretation & Clinical Decision-Making Screening Guidelines & Evidence-Based Health Promotion (USPSTF) Comprehensive Geriatric Assessment (CGA), Frailty & Function In-Office Clinical Procedures, ECG Interpretation & Minor Surgical Skills
3 Cardiovascular & Peripheral Vascular Disorders
Essential Hypertension & Hypertensive Urgency/Emergency Management Coronary Artery Disease, Acute Coronary Syndromes & Post-MI Care Heart Failure (HFrEF & HFpEF) Diagnosis, Staging & 4-Pillar GDMT Arrhythmias (Atrial Fibrillation), Valvular Heart Disease & PAD
4 Respiratory, HEENT & Dermatological Disorders
Asthma Management across the Adult Lifespan (GINA Guidelines) Chronic Obstructive Pulmonary Disease (COPD) Staging & Management (GOLD Guidelines) Community-Acquired Pneumonia & Lower Respiratory Tract Infections Common HEENT Disorders: Otitis, Sinusitis, Pharyngitis, Glaucoma & Macular Degeneration
5 Endocrine, Metabolic & Renal/Genitourinary Disorders
Type 2 Diabetes Mellitus Management Thyroid Disorders: Hypothyroidism, Hyperthyroidism & Subclinical Disease Chronic Kidney Disease (CKD) Staging & Diabetic/Hypertensive Nephropathy Genitourinary Disorders: BPH, Urinary Incontinence, UTIs & Prostatitis
6 Gastrointestinal, Hematologic & Immunologic Disorders
Upper Gastrointestinal Disorders: Dyspepsia, GERD, PUD & H. pylori Lower Gastrointestinal Disorders: IBS, IBD, Diverticulitis & Colorectal Screening Liver, Biliary & Pancreatic Disorders: NAFLD/MASLD, Cirrhosis & Cholecystitis Hematologic & Immunologic Disorders: Anemias, Anticoagulation & Immunizations
7 Neurological, Cognitive & Psychiatric Disorders
Cognitive Assessment: Delirium, Dementia & Mild Cognitive Impairment Neurological Disorders: Stroke, TIA, Parkinson's Disease & Headache Syndromes Major Depressive Disorder & Anxiety Disorders in Adults & Older Adults Sleep Disorders, Insomnia & Restless Legs Syndrome
8 Geriatric Syndromes, Polypharmacy & Deprescribing
The Beers Criteria & STOPP/START Criteria for Potentially Inappropriate Medication Use Polypharmacy Management, Pharmacokinetics/Pharmacodynamics in Aging & Deprescribing Protocols Fall Risk Assessment (CDC STEADI), Gait/Balance & Mobility Impairments Pressure Injury Prevention/Staging, Urinary/Fecal Incontinence & Frailty Assessment
9 APRN Professional Practice, Ethics, Quality & Healthcare Policy
Musculoskeletal Disorders: Osteoarthritis, Osteoporosis, Gout & Back Pain Dermatological Disorders: Lesions, Skin Cancers, Infections & Rash Evaluation Palliative Care, Advance Care Planning, Pain Management & End-of-Life APRN Professional Practice, Quality Improvement, Ethics & Healthcare Policy
Musculoskeletal Disorders: Osteoarthritis, Osteoporosis, Gout & Back Pain
Key Takeaways Explain This Topic AI
Osteoarthritis (OA) presents with asymmetrical joint involvement, gel phenomenon (<30 minutes morning stiffness), Heberden's (DIP) and Bouchard's (PIP) nodes, with first-line treatment being topical NSAIDs or oral acetaminophen before oral NSAIDs.
Osteoporosis is diagnosed via DEXA dual-energy X-ray absorptiometry T-score <= -2.5 (osteopenia -1.0 to -2.5); first-line pharmacotherapy is oral bisphosphonates (alendronate/risedronate) taken upright on an empty stomach with a full glass of water.
Acute Gout manifests as monoarticular inflammation (podagra) with negative birefringent needle-shaped uric acid crystals; acute flare management includes colchicine (within 36 hours), NSAIDs, or systemic steroids, while urate-lowering therapy (allopurinol) aims for serum uric acid <6 mg/dL.
Acute low back pain without red flags (cauda equina, fever, trauma, progressive neurological deficit) requires conservative management with continued activity, acetaminophen/NSAIDs, and heat; routine lumbar spine imaging within 4-6 weeks is not recommended.
Geriatric MSK management requires adherence to Beers Criteria 2023: avoiding chronic systemic NSAID use without PPI protection, assessing fall risk with STEADI, and monitoring renal function before bisphosphonates (contraindicated if eGFR <35 mL/min).
Last updated: July 2026
- Musculoskeletal Disorders: Osteoarthritis, Osteoporosis, Gout & Back Pain
- 1. Osteoarthritis (OA): Pathophysiology, Presentation & Management
Osteoarthritis (OA) is the leading cause of joint dysfunction in adults, characterized by articular cartilage degradation, subchondral bone remodeling, osteophyte formation, and mild synovial inflammation. Unlike rheumatoid arthritis (RA), which is a systemic autoimmune polyarthritis, OA is a mechanical and degenerative process affecting load-bearing joints.
Clinical Presentation & Exam Findings
Patients present with localized joint pain worsening with activity and improving with rest. Advanced disease features pain at rest. Morning stiffness lasts less than 30 minutes ("gel phenomenon"). Exam reveals joint line tenderness, crepitus, restricted motion, and effusion without marked warmth. Hand manifestations include:
Heberden's Nodes : Bony enlargements at distal interphalangeal (DIP) joints.
Bouchard's Nodes : Bony overgrowths at proximal interphalangeal (PIP) joints.
First CMC Joint Involvement : Squaring of the thumb base.
Diagnostics & Management Guidelines
Plain weight-bearing X-rays show asymmetrical joint space narrowing, subchondral sclerosis, cysts, and osteophytes. ESR/CRP are normal.
Non-Pharmacological : Low-impact exercise, physical therapy, weight loss (1 lb weight loss removes 4 lbs knee pressure), assistive devices.
Pharmacotherapy :
Topical NSAIDs : Topical diclofenac gel is first-line for knee/hand OA in older adults, offering pain relief equivalent to oral NSAIDs with minimal systemic absorption, avoiding GI, renal, and CV toxicity.
Acetaminophen : For mild pain; max daily dose is 2,000–3,000 mg/day in older adults (<2,000 mg/day in liver disease).
Oral NSAIDs : Effective but risky. Per Beers Criteria 2023 , chronic oral NSAIDs should be avoided in older adults due to GI bleeding, acute kidney injury, hypertension, and heart failure risk. If needed, use celecoxib or an NSAID with a PPI for the shortest duration.
Injections : Intra-articular corticosteroids provide short-term relief (4–12 weeks) for acute flares.
2. Osteoporosis & Bone Health Assessment
Osteoporosis is a systemic skeletal disease characterized by low bone mineral density (BMD) and microarchitectural deterioration, predisposing to fragility fractures.
Screening & Diagnostic Criteria
Screening via Dual-Energy X-ray Absorptiometry (DEXA) scanning is recommended for:
All women aged >=65 years and men aged >=70 years .
Postmenopausal women and men aged 50–69 with risk factors (smoking, alcohol, low BMI <20, steroid use >=3 months).
Any adult sustaining a fragility fracture after age 50.
Diagnosis relies on WHO T-scores :
Normal : T-score >= -1.0 SD.
Osteopenia : T-score between -1.0 and -2.5 SD.
Osteoporosis : T-score <= -2.5 SD at lumbar spine, femoral neck, or total hip, OR a low-trauma fragility fracture.
Pharmacological & Lifestyle Interventions
Lifestyle : Weight-bearing exercise, fall prevention (STEADI tool), smoking cessation. Calcium total intake 1,200 mg/day ; Vitamin D3 800–2,000 IU/day .
First-Line Therapy (Bisphosphonates) : Oral alendronate (70 mg weekly) or risedronate (35 mg weekly) inhibit osteoclast resorption.
Administration Protocol : Take immediately upon waking with 8 oz plain water, at least 30–60 minutes before food, drink, or medications. Remain upright for >=30 minutes to prevent esophageal ulceration.
Contraindications : Esophageal stricture, inability to sit upright, or severe renal impairment ( eGFR <35 mL/min ). Consider bisphosphonate holiday after 3–5 years to minimize atypical femur fracture and jaw osteonecrosis (ONJ) risks.
Alternative Agents : Subcutaneous Denosumab (RANKL inhibitor) every 6 months is safe in renal impairment (eGFR <30 mL/min), but cannot be stopped abruptly due to rebound fracture risk.
3. Gout & Crystal Arthropathies
Gout is an intensely painful inflammatory arthritis caused by monosodium urate (MSU) crystal deposition secondary to chronic hyperuricemia (serum uric acid >6.8 mg/dL).
Clinical Presentation & Diagnostics
Flares present with sudden monoarticular joint pain, swelling, warmth, and erythema, peaking within 12–24 hours. The first metatarsophalangeal (MTP) joint is involved in >50% of initial cases ( podagra ).
Gold Standard : Arthrocentesis showing intracellular needle-shaped, negatively birefringent MSU crystals under polarized light. Serum uric acid may be falsely normal during acute flares; recheck in 2–4 weeks.
Flare Treatment vs. Chronic Urate-Lowering Therapy (ULT)
Acute Flare : Colchicine (1.2 mg at onset, then 0.6 mg 1 hour later; total 1.8 mg within 36 hours), short-course NSAIDs, or oral prednisone (30–40 mg/day tapered over 7–10 days; preferred in older adults with renal/cardiac risk).
Chronic ULT : Indicated for >=2 flares/year, tophi, or CKD stage 3–5. Allopurinol is first-line (start 100 mg daily; titrate to serum uric acid <6.0 mg/dL ).
Safety Pearl : Screen for HLA-B*5801 allele in high-risk populations (Han Chinese, Thai, Korean descent, or African Americans with CKD) prior to allopurinol to prevent fatal Stevens-Johnson syndrome.
Prophylaxis : Co-prescribe low-dose colchicine (0.6 mg daily) or NSAID for 3–6 months during ULT initiation to prevent flare mobilization.
4. Low Back Pain (LBP) & Vertebral Syndromes
Low back pain is a common primary care complaint requiring differentiation of benign mechanical causes from serious pathology.
Differential Diagnosis & Red Flag Screening
Mechanical LBP (90%) : Lumbar strain, degenerative disc disease, facet joint osteoarthritis.
Radiculopathy : Nerve root compression (L4-S1) causing sharp pain radiating down the leg past the knee (sciatica).
Spinal Stenosis : Narrowing of spinal canal causing neurogenic claudication (leg pain/weakness worse with extension/walking, relieved by sitting/forward flexion).
Red Flags (Immediate Imaging/ER) : Cauda Equina Syndrome (urinary retention, fecal incontinence, saddle anesthesia, bilateral motor loss), malignancy history, fever/chills (epidural abscess), major trauma.
Exam & Guideline Management
Straight Leg Raise (SLR) : Pain radiating below knee at 30–70 degrees elevation indicates nerve root irritation.
Imaging Guidelines : Routine X-rays or MRI are not recommended within the first 4–6 weeks unless Red Flags are present.
First-Line Care : Continued physical activity (avoid bed rest >2 days), heat application, short-term acetaminophen or NSAIDs. Skeletal muscle relaxants (cyclobenzaprine) carry high anticholinergic risk in elderly (Beers Criteria). Physical therapy for persistent pain (>2–4 weeks).
Summary Matrix
Condition Key Diagnostic Finding First-Line Treatment Critical Guideline / Beers Caution
Osteoarthritis Asymmetrical space narrowing, Heberden nodes Topical diclofenac gel, exercise Avoid chronic oral NSAIDs in elderly without PPI
Osteoporosis DEXA T-score <= -2.5 Oral bisphosphonates (alendronate) Take upright with water on empty stomach; eGFR >=35
Gout Needle-shaped negative birefringent MSU crystals Colchicine (acute); Allopurinol (chronic) Screen HLA-B*5801 before allopurinol; 3-6m prophylaxis
Low Back Pain Positive SLR (radiculopathy); neurogenic claudication Active recovery, heat, NSAIDs No imaging in first 4-6 weeks unless Red Flags