Preoperative Loss of Knee Extension Affects Knee Extension Deficit in Patients After Anterior Cruciate Ligament Reconstruction.

Background: Loss of knee extension (LOE) after anterior cruciate ligament reconstruction (ACLR) is associated with limited knee joint function and increased risk for knee osteoarthritis.

Hypothesis: Preoperative LOE will affect postoperative LOE for up to 12 months after ACLR.

Study Design: Cohort study; Level of evidence, 2.