Knee osteoarthritis(OA)is a chronic disease characterized by knee cartilage degeneration and secondary bone hyperplasia.Anterior cruciate ligament(ACL)tear is a common sports injury,which need to be underwent anterior cruciate ligament reconstruction(ACLR),and some scholars have proposed that ACLR is one of the risk factors for secondary patellofemoral OA.Patellofemoral OA is closely related to knee OA.Therefore,reducing the incidence of patellofemoral OA after ACLR is also an important part of reducing or delaying knee OA.However,the mechanism of patellofemoral OA after ACLR remains unclear.This article reviewed relevant literature at home and abroad,and summarized the latest progress in epidemiology and risk factors of patellofemoral OA after ACLR to provide a reference for clini-cal diagnosis and treatment.
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