Fitness
Knee Extension Lag
Knee extension lag is incomplete knee straightening after ACL surgery—a priority metric treated with quad work, swelling control, and terminal extension.
Knee extension lag is the inability to fully straighten the operated knee compared to the other side—often measured by heel height lying down or lack of passive hyperextension when appropriate. It is a common early ACL surgery complication that can become stiff fibrosis if ignored.
Treatment emphasizes quad activation, swelling control, patellar mobilization, and terminal knee extension within PT guidance. Even small lag alters gait and quad recruitment.
Common questions
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Why is extension lag urgent after ACL surgery?
Chronic flexion contracture is harder to fix than early lag. Daily extension work and swelling management in the first weeks protect long-term ROM.
Related terms
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