What lag inextension of knee?

Lag in extension of the knee refers to the inability to fully extend the knee joint, often observed during rehabilitation or after an injury. This condition can occur due to muscle weakness, joint stiffness, or pain, leading to a noticeable gap between the desired and actual extension. It is commonly assessed during physical therapy, where patients may struggle to achieve full extension while lying down or sitting. Addressing lag in extension is crucial for restoring normal knee function and mobility.