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The science of anterior cruciate ligament rehabilitation.

This review of the literature assessed what is known about the biomechanics of the normal anterior cruciate ligament during rehabilitation exercises, the biomechanical behavior of the anterior cruciate ligament graft during healing, and clinical studies of rehabilitation after anterior cruciate ligament replacement. After anterior cruciate replacement, immobilization of the knee, or restricted motion without muscle contraction, leads to undesired outcomes for the ligamentous, articular, and muscular structures that surround the joint. It is clear that rehabilitation that incorporates early joint motion is beneficial for reducing pain, minimizing capsular contractions, decreasing scar formation that can limit joint motion, and is beneficial for articular cartilage. There is evidence derived from randomized controlled trials that immediately after anterior cruciate ligament reconstruction, weightbearing is possible without producing an increase of anterior knee laxity and is beneficial because it lowers the incidence of patellofemoral pain. Rehabilitation with a closed kinetic chain program results in anteroposterior knee laxity values that are closer to normal, and earlier return to normal daily activities, compared with rehabilitation with an open kinetic chain program. This review revealed that more randomized, controlled trials of rehabilitation are needed. These should include the clinicians' and patients' perspective of the outcome, and biomarkers of articular cartilage metabolism.