The post-operative patellar tendon length was studied to evaluate the possible tendon length change after anterior cruciate ligament (ACL) reconstruction with hamstring autografts.The Insall-Salvati index,modified Insall-Salvati index,curved modified Insall-Salvati index and Caton-Deschamps index were observed by MRI during a follow-up period of 12 weeks on 20 ACL reconstructed knees.The results showed no patellar baja or alta pre-existed on those ACL injured patients.After a follow-up period of 12 weeks,no patellar tendon length change was observed.It is suggested that the change of patella was not the primary reason that may contribute to the premature patellofemoral joint osteoarthritis after ACL reconstruction.
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