Disease severity affects knee range of motion but not strength deficits in knee osteoarthritis: a systematic review and meta-analysis

Individuals with symptomatic knee osteoarthritis present with marked reductions in knee range of motion and strength. While range of motion impairments worsen with disease severity, strength deficits are stable across Kellgren-Lawrence grades and measurement protocols. Given the very low to low certainty of evidence, results should be interpreted with caution.