Management of Knee Osteoarthritis in Runners

Non-Pharmacologic Management

The American Academy of Orthopaedic Surgeons suggests incorporating activity modifications, such as walking instead of running or alternative activities, into lifestyle for patients with symptomatic knee OA (Grade B recommendation) 1
All patients with knee OA should participate in cardiovascular and/or resistance land-based exercise programs, regardless of whether they continue running 2, 3, 4
Low-impact aerobic fitness exercises, such as walking or cycling, reduce pain (effect size 0.52) and disability (effect size 0.46) with statistical significance (Grade A recommendation) 5
Quadriceps strengthening exercises significantly improve pain (effect size 1.05) and should be performed at least 2 days per week at moderate to vigorous intensity (60-80% of one repetition maximum) for 8-12 repetitions (Grade B recommendation) 5, 6
Weight loss of minimum 5% body weight is strongly recommended for overweight patients (BMI >25), producing clinically important functional improvement (WOMAC function subscale effect size 0.69; Grade A recommendation) 5, 7

Acetaminophen (up to 3,000-4,000 mg/day) is the preferred initial oral analgesic for mild-to-moderate pain 3, 4, 7
Topical NSAIDs have clinical efficacy with better safety profile than oral NSAIDs, particularly for patients ≥75 years 2, 9, 7
Oral NSAIDs (including COX-2 selective inhibitors) should be considered for inadequate response to acetaminophen, using lowest effective dose for shortest duration with gastroprotection when indicated 2, 3, 7
Intra-articular corticosteroid injections are indicated for acute pain flares, especially with effusion, with benefits lasting up to 3 months (limit to 3-4 injections per year) 3, 9, 7

Progressive worsening of pain despite self-modification of running intensity/duration suggests need for temporary cessation and focus on alternative aerobic activities 1
Development of acute effusion or inflammatory flares requires rest, possible corticosteroid injection, and gradual return only after resolution 9, 7
Radiographic progression to severe disease (Kellgren-Lawrence grade 4) with persistent symptoms unresponsive to conservative management may indicate need for surgical consultation 7