We studied changes in patellar ligament length after reconstruction of the anterior cruciate ligament using either the middle of the patellar ligment as an autogenous graft or a Dacron prosthesis wrapped into the ilio-tibial tract. The mean change in length in the ligament graft group was 1.9%; in the Dacron group it was 1.5%. The change in length was no significanat in both groups. There was shortening of 7% or more in these groups.
