Musculoskeletal (MSK) Knee Practice Test

The main idea is that restoring knee motion after ACL reconstruction hinges on achieving full extension as soon as safely possible, because an extension deficit sets the stage for altered gait and long-term joint problems. Early on, swelling, pain, and graft protection limit movement, so rehab focuses on controlling inflammation and gradually regaining motion. By about 6 to 8 weeks, most patients can tolerate and achieve full extension, which provides a stable foundation for restoring flexion, strength, and neuromuscular control. If full extension isn’t reached by this window, the risk of lasting extension loss and compensatory movement increases. Earlier timeframes (2-4 weeks or 4-6 weeks) are typically too soon for reliable full extension, while later phases (8-12 weeks) focus more on progressing overall ROM and strengthening once extension has been normalized.