Diagnosis and Treatment of Osteoarthritis
Diagnostic Workup
Osteoarthritis diagnosis is primarily clinical, based on characteristic joint pain with functional limitation, supported by physical examination findings and plain radiographs when needed. 1, 2
Clinical Assessment
- Assess pain characteristics: typically worse with weight-bearing and activity, with stiffness after inactivity (morning stiffness lasting <30 minutes distinguishes OA from inflammatory arthritis). 2, 3
- Perform joint-specific examination: look for bony enlargement in knee OA and pain elicited with internal hip rotation in hip OA. 2, 4
- Evaluate functional impact: assess effects on quality of life, occupation, mood, relationships, leisure activities, and activities of daily living. 1
- Identify risk factors: age >75 years (33% have symptomatic knee OA), female sex, obesity, genetics, and major joint injury. 2
Imaging and Laboratory Studies
- Plain radiographs remain the primary imaging modality: look for marginal osteophytes and joint space narrowing (Kellgren-Lawrence grading). 2, 4
- Blood tests are performed only to exclude secondary causes: there are no diagnostic blood tests for primary OA. 3
- Advanced imaging (MRI, ultrasound) is reserved for: unclear diagnosis, suspected secondary pathology, or pre-surgical planning. 4, 5
Common Diagnostic Pitfalls
- Not all joint pain in older adults is OA: even with radiographic changes, symptoms may arise from secondary disorders such as enthesopathy, tendinopathy, or bursitis that respond better to local injections and physiotherapy. 4
- Radiographic severity does not correlate with symptom severity: many patients with severe radiographic changes have minimal symptoms and vice versa. 2
Treatment Algorithm
Core Non-Pharmacological Treatments (Mandatory for All Patients)
Every patient with symptomatic osteoarthritis must receive education, exercise prescription, and weight management advice—these are not optional adjuncts but foundational treatments. 1, 6
Patient Education
- Provide oral and written information to counter the misconception that OA is inevitably progressive and untreatable. 1, 6
- Emphasize self-management strategies including activity pacing (avoiding "peaks and troughs"), use of shock-absorbing footwear, and joint protection techniques. 1, 7
Exercise Programs
- Prescribe structured exercise including local muscle strengthening and general aerobic fitness, with effect sizes for pain reduction of 0.57–1.0. 1, 6, 2
- Tailor exercise mode to patient preference: individual or group sessions, supervised or home-based, land-based or aquatic, face-to-face or digital delivery—all are effective. 1
- Specific recommendations by joint: balance exercises and tai chi for knee OA; manipulation and stretching for hip OA. 1, 6
Weight Management
- For overweight or obese patients (BMI ≥25 kg/m²): weight loss interventions are strongly recommended as they directly reduce joint loading and pain. 1, 6, 7
Pharmacological Treatment (Stepwise Escalation)
Step 1: Acetaminophen (Paracetamol)
- Start with acetaminophen 3,000–4,000 mg daily in divided doses (use 3,000 mg ceiling in elderly to minimize hepatotoxicity risk). 8, 6, 7
- Schedule regular dosing rather than PRN for better sustained pain control. 8
- Acetaminophen provides analgesia comparable to NSAIDs with markedly lower gastrointestinal, renal, and cardiovascular risk. 8, 6
Step 2: Topical NSAIDs
- For knee and hand OA, add topical NSAIDs (diclofenac 1–1.5% gel or ketoprofen gel) before oral NSAIDs because systemic absorption is minimal. 1, 8, 7
- Topical capsaicin is an alternative but requires continuous application for 2–4 weeks to achieve benefit. 1, 7
Step 3: Oral NSAIDs or COX-2 Inhibitors
- Use oral NSAIDs only after acetaminophen and topical agents fail, at the lowest effective dose for the shortest duration. 1, 6, 7
- Mandatory co-prescription of a proton pump inhibitor for gastroprotection, selecting the lowest-cost option. 1, 7
- Assess cardiovascular, gastrointestinal, and renal risk factors before prescribing, particularly in patients >50 years. 1, 8, 7
- All oral NSAIDs provide similar analgesia but differ in toxicity profiles; elderly patients face substantially higher risks of GI bleeding, renal insufficiency, and cardiovascular events. 1, 8
Step 4: Intra-Articular Corticosteroid Injections
- Indicated for moderate-to-severe pain with joint effusion or inflammation, providing short-term relief lasting 1–3 weeks. 8, 6, 7
- Particularly appropriate when oral NSAIDs are contraindicated (e.g., renal insufficiency, cardiovascular disease, GI bleeding history). 8
Step 5: Adjunctive Medications for Refractory Pain
- Duloxetine 30 mg daily for one week, then 60 mg daily is conditionally recommended for OA with neuropathic pain features; doses >60 mg add no benefit. 8, 2
- Tramadol (weak opioid) only after failure of all above therapies, using slow upward titration to improve tolerability. 8, 7
- Strong opioids are reserved for patients unwilling or unable to undergo joint replacement after all other medical therapies have failed. 8, 7
Adjunctive Non-Pharmacological Therapies
- Local heat or cold applications for symptom relief. 1, 7
- Transcutaneous electrical nerve stimulation (TENS) may provide additional pain relief. 1, 6
- Assistive devices (walking sticks, canes, tap turners) for those with specific functional limitations. 1, 6
- Bracing and orthotics: medial wedge insoles for valgus knees, lateral insoles for varus knees, trapeziometacarpal splints for thumb-base OA. 1, 7
- Manual therapy (manipulation and stretching) particularly for hip OA. 1, 6
- Cognitive behavioral therapy and self-management programs are conditionally recommended. 1, 7
Treatments NOT Recommended
Do not prescribe glucosamine or chondroitin supplements—current evidence does not demonstrate efficacy. 1, 8, 6
Do not use electroacupuncture; insufficient evidence exists for traditional acupuncture. 1, 7
Do not routinely offer arthroscopic lavage or debridement unless there is clear mechanical locking from loose bodies. 6, 7
Surgical Referral Criteria
Refer for total joint replacement when joint symptoms substantially impair quality of life and are refractory to the full core treatment package outlined above. 6, 7
- Earlier referral—before prolonged functional limitation develops—improves postoperative outcomes. 6, 7
- Patient-specific factors (age, sex, smoking, obesity, comorbidities) should not be barriers to referral. 6, 7
Critical Safety Considerations
- Never prescribe oral NSAIDs without concurrent PPI gastroprotection. 1, 8, 7
- Never exceed 4,000 mg daily acetaminophen (3,000 mg in elderly). 8, 6
- Assess renal function before any oral NSAID; use is contraindicated or requires extreme caution in renal insufficiency. 8
- Oral NSAIDs are contraindicated or require extreme caution in heart failure, uncontrolled hypertension, and cardiovascular disease. 8
- Reserve opioids as absolute last-line therapy due to high toxicity, dependence risk, and limited long-term benefit. 8