Study Notes on Musculoskeletal Disorders and Management

Musculoskeletal Disorders and Management

General Overview

  • Presenters:

    • Dr. Anna George, PhD, APRN, NP-C

    • Dr. Kerry Mastrangelo, DNP, APRN, NP-C

  • Focus on various musculoskeletal conditions:

    • Osteoarthritis

    • Rheumatoid Arthritis

    • Gout

    • Osteomyelitis

    • Osteoporosis

    • Sprains/Strains/Fractures

    • Ligament/Tendon/Cartilage Injuries

    • Carpal/Cubital Tunnel Syndromes

    • Epicondylitis

    • Fibromyalgia

    • Back Pain

Osteoarthritis (OA)

Etiology

  • Involves mechanical and biological processes leading to degradation of articular cartilage in joints.

  • Most vulnerable joints: hips, knees, hands, and spine.

  • Progression: leads to a 'bone on bone' state.

Incidence

  • Affects 25% of adults; chronic condition primarily in those aged 65 and older.

  • Higher prevalence in women compared to men.

Risk Factors

  • Advancing age

  • Joint overuse and trauma

  • Obesity

  • Genetic predisposition and metabolic disorders (e.g., gout, hyperparathyroidism)

Prevention and Screening

  • Maintain physical activity and ideal body weight.

  • Avoid obesity; control metabolic and endocrine disorders.

Clinical Presentation

History

  • Gradual onset of joint pain, tenderness, and stiffness.

  • Symptoms worsen with activity and improve with rest.

  • Morning stiffness lasts less than 30 minutes.

  • Joint instability in later stages.

Physical Examination

  • Pain often localized to affected joints, most common in the hands.

  • Tenderness, stiffness, and coolness to touch are typical findings.

  • Signs: Bouchard's nodes (PIP joints) and Heberden's nodes (DIP joints).

  • Crepitus and mild joint effusion may be present.

Diagnosis and Differential Diagnosis

Imaging Studies

  • Use X-rays to identify uneven and narrowed joint spaces indicating destruction.

Laboratory Tests

  • No specific lab tests available; use normal RF (rheumatoid factor) testing and uric acid levels to rule out rheumatoid arthritis and gout respectively.

Differential Diagnoses

  • Consider conditions such as rheumatoid arthritis, psoriatic arthritis, gout, septic arthritis, Lyme disease, and lupus.

  • Dexa and QCT scans help assess bone mineral density.

Management of Osteoarthritis

Goals

  • Symptom relief, maintain/improve joint function, and avoid negative medication effects.

Non-Pharmacological Approaches

  • Encourage physical activity, supervised therapy, and self-management programs.

  • Utilize ambulation aids and surgical intervention when necessary.

Pharmacological Management

  • OTC options: acetaminophen (1 gm BID), NSAIDs (e.g., Naproxen), with caution for patients over 65 or those with GI issues.

    • Naproxen 500 mg BID, Diclofenac 50 mg, Motrin 600 mg TID, Meloxicam 15 mg QD.

  • Consider COX-2 inhibitors (e.g., Celebrex 200 mg daily) for lower GI toxicity.

  • Topical therapies: Voltaren gel, Capsaicin cream.

  • Short-term narcotics if necessary, intra-articular corticosteroid injections limited to 3 per year.

  • Joint replacement for severe, refractory cases.

Rheumatoid Arthritis (RA)

Pathophysiology

  • Chronic, systemic inflammatory disease affecting primarily synovial joints with symmetrical distribution.

  • Significant destruction of small joints and extra-articular symptoms prominent.

Incidence and Demographics

  • Worldwide incidence with juvenile RA occurring in children <16 years with chronic inflammation.

  • Affects >5 joints in adults; 3 times more common in women.

Risk Factors

  • Potential genetic components, autoimmune conditions, age (common between 30 and 50), and family history of autoimmune diseases.

Clinical Presentation
History

  • Critical to diagnose early for better prognosis.

  • Symptoms include malaise, fever, weight loss, morning stiffness longer than 30 minutes, and symmetrical joint involvement (75% knees, then elbows/ankles).

Physical Examination

  • Edema, erythema, warmth, tenderness, and subcutaneous nodules common.

  • Systemic manifestations can impact various body systems.

Diagnosis
Diagnostic Criteria

  • Use criteria based on the number of affected joints, serum RF factor status, duration of symptoms, CRP, and ESR levels.

    • Total score of 6 required for definitive diagnosis.

Differential Diagnoses

  • Consider SLE, psoriatic arthritis, septic arthritis, Lyme disease, gout, and osteoarthritis.

Management of RA
Goals

  • Early intervention to limit joint damage and improve mobility.

Non-Pharmacological Approaches

  • Important: complete rest during acute inflammation.

  • Physical and occupational therapies focus on strengthening and joint function.

Pharmacological Management

  • 1st line: DMARDs. Start Methotrexate 7.5-10 mg weekly, titrate up depending on response.

  • NSAIDs can be used alongside DMARDs.

  • Biological agents (e.g., Etanercept and Infliximab) may cause hypersensitivity reactions and require careful monitoring.

  • Corticosteroids may be used for exacerbations and require tapering post-treatment.

Gout

Etiology

  • Metabolic disease leading to arthritis, caused by uric acid or monosodium urate crystal deposits.

  • Can be primary (genetic) or secondary (underlying conditions).

Clinical Presentation
History

  • Sudden pain, usually in the big toe, accompanied by fever, malaise.

Physical Examination

  • Acute attacks display affected joints as red, hot, swollen, and tender.

Diagnostic Studies

  • CBC, joint aspirate for needle-shaped crystals (gold standard), serum uric acid levels.

Differential Diagnoses

  • Include septic joints, pseudogout, RA, and cellulitis.

Management of Gout
Non-Pharmacological Approaches

  • Dietary modifications, hydration, rest during attacks.

Pharmacological Management

  • First-line: NSAIDs (Indomethacin, Naproxen).

  • Corticosteroids if NSAIDs are contraindicated.

  • Long-term maintenance: Allopurinol to maintain uric acid < 6 mg/dL; can use Probenecid as second-line treatment.

Osteomyelitis

Overview

  • Local bone infection, can be acute or chronic, typically bacterial (most commonly Staphylococcus aureus).

Clinical Presentation
History

  • Trauma history common in 75% of cases; fever with localized symptoms.

Physical Exam

  • Swelling, erythema, possible abscess formation.

Diagnostic Tests

  • CBC, elevate ESR & CRP, positive blood and bone cultures, MRI to define infection extent.

Management

  • Surgical debridement and prolonged IV antibiotic therapy are the mainstay treatment.

Osteoporosis

Definition

  • Metabolic disease characterized by decreased bone density and increased fracture risk.

Incidence & Risk Factors

  • Affects millions, particularly postmenopausal women and those at risk include genetic predisposition, vitamin D deficiency, and advanced age.

Management
Non-Pharmacological Treatment

  • Weight-bearing exercises, adequate calcium (1000-2500 mg/day) and vitamin D (400-800 IU) intake.

Pharmacological Options

  • First-line: Bisphosphonates (e.g., Alendronate) for inhibiting bone resorption.

  • SERMs and Calcitonin can be options depending on patient profile.

Sprains and Strains

Definition

  • Sprain: injury to ligaments; Strain: injury to muscles/tendons.

Incidence and Risk Factors

  • Common in sports; can occur in sedentary individuals as well.

Management

  • RICE (Rest, Ice, Compression, Elevation) for minor injuries; NSAIDs for pain.

  • Severe cases may require physical therapy or surgery.

Carpal Tunnel and Cubital Tunnel Syndromes

Etiology and Risk Factors

  • Overuse syndromes primarily due to repetitive wrist movements leading to median nerve or ulnar nerve compression, respectively.

Clinical Presentation

  • Symptoms may include burning pain, numbness, and weakness in the hand.

Management

  • Non-pharmacological: wrist splinting, ergonomic adjustments.

  • Pharmacological: NSAIDs, corticosteroid injections; surgery may be necessary if conservative management fails.

Epicondylitis (Tennis and Golfer's Elbow)

Etiology

  • Overuse injuries affecting the tendons of the forearm caused by repetitive motions.

Assessment & Management

  • Physical examination reveals tenderness over the epicondyles.

  • Management includes rest, ice, physiotherapy, and sometimes corticosteroidal injections.

Fibromyalgia

Definition

  • Characterized by widespread muscle pain and tenderness.

Management

  • Gradual exercise programs, cognitive-behavioral therapy, and medications like SSRIs and other pain management agents may be used.

Low Back Pain

Incidence and Risks

  • Common and often resolves with conservative management within weeks; complex differential diagnosis.

Management

  • Conservative treatment with NSAIDs and physiotherapy, education on proper body mechanics and appropriate activity levels are recommended.