This 1989 prospective study followed 126 ACL reconstruction patients for 1 year to determine the prevalence of 13 postoperative complications. It asked whether the three most common — quadriceps weakness, flexion contracture, and patellofemoral pain — are causally linked rather than independent problems. The answer fundamentally changed how postoperative rehabilitation was conceptualized.
Early ACL rehabilitation in the 1980s routinely immobilized knees in flexion — a protocol this paper's data indicts directly. The 24% flexion contracture rate and near-universal quadriceps weakness observed here were not inevitable; they were consequences of a modifiable rehab decision.
When your post-op ACL patient has anterior knee pain and weak quads, do not treat these as separate problems. This paper shows they share a root cause: a knee that never fully regained terminal extension. Prioritize full extension from day one. A patient who achieves full extension and avoids patellar irritability has a 46% chance of a normal quadriceps index at 1 year; one with both problems has only a 6% chance.
For graft selection counseling: patellar tendon harvest independently reduces quadriceps strength at 1 year even after removing every confounding variable. The hamstring graft does not carry this cost to the flexors. This tradeoff. Stability vs. Extensor mechanism morbidity. Is one this paper was among the first to quantify.
This 1989 prospective study followed 126 ACL reconstruction patients for 1 year to determine the prevalence of 13 postoperative complications. It asked whether the three most common — quadriceps weakness, flexion contracture, and patellofemoral pain — are causally linked rather than independent problems. The answer fundamentally changed how postoperative rehabilitation was conceptualized.
Early ACL rehabilitation in the 1980s routinely immobilized knees in flexion — a protocol this paper's data indicts directly. The 24% flexion contracture rate and near-universal quadriceps weakness observed here were not inevitable; they were consequences of a modifiable rehab decision.
When your post-op ACL patient has anterior knee pain and weak quads, do not treat these as separate problems. This paper shows they share a root cause: a knee that never fully regained terminal extension. Prioritize full extension from day one. A patient who achieves full extension and avoids patellar irritability has a 46% chance of a normal quadriceps index at 1 year; one with both problems has only a 6% chance.
For graft selection counseling: patellar tendon harvest independently reduces quadriceps strength at 1 year even after removing every confounding variable. The hamstring graft does not carry this cost to the flexors. This tradeoff. Stability vs. Extensor mechanism morbidity. Is one this paper was among the first to quantify.