
Purpose: To examine the longitudinal changes in patellar alignment before, 6 months after, and 3 years after ACLR and to compare these variations, if present, with patellar alignment in controls. Results: In the knee-extended condition, greater patellar lateral displacement was observed at the ACL-deficient state and 6 months after ACLR compared with 3 years after ACLR within the ACLR group. Greater patellar lateral tilt was observed at the ACL-deficient state compared with 3 years after ACLR and compared with the control group. Less lateral spin was observed at the ACL-deficient state and 6 months after ACLR compared with 3 years after ACLR and compared with the control group.
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