Background: Approximately 50% of adolescents and young adults who rupture their anterior cruciate
ligament (ACL) develop osteoarthritis within 10 years. While most reports of osteoarthritis
after ACL injury focus on the tibiofemoral joint, patellofemoral osteoarthritis is
common and strongly associated with symptoms and impaired function. The mechanisms
underpinning the development of patellofemoral osteoarthritis after ACL injury are
unknown but may relate to altered joint loading. This study aimed to determine if
altered patellofemoral loading is associated with the presence and/or worsening of
early patellofemoral osteoarthritis following ACL reconstruction (ACLR).
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