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Between 1982 and 1986, 126 patients who had under gone ACL reconstruction were followed in a prospec tive manner. One year follow-up statistics were re viewed for the presence of 13 different complications. The most prevalent complications were quadriceps weakness, flexion contracture, and patellofemoral pain. Quadriceps weakness (strength less than 80% of the normal side) was present in 65% of patients and cor related positively with flexion contracture, patellar irrit ability, and ACL reconstructions using patellar tendon grafts. Flexion contracture of 5° or more was present in 24% of patients and correlated positively with in creased age and patellar irritability. Patellofemoral pain was present in 19% of patients and correlated positively with flexion contracture.

Clinical relevance: The three most common compli cations of knee ligament surgery are shown to be strongly interrelated. It is likely that a causal …