For many years, our laboratory has been examining the functional capabilities and movement strategies of individuals who sustain anterior cruciate ligament injuries of the knee. Using a battery of clinical tests and measures with these athletes, we have learned that not all of these individuals respond similarly to injury. Some athletes, called potential copers, experience a high level of function after their injury. Rehabilitation that involves specialized training called perturbation training allows the majority of potential copers to be successful in returning to sports in the short-term. Non-copers, however, are a group of anterior cruciate ligament-injured athletes with poor knee stability during daily activities. The capability of these individuals to return to sport is limited, and anterior cruciate ligament reconstruction is typically recommended.

Over the last five years, we have begun to investigate the effects of perturbation training on non-copers. Non-copers represent the majority of anterior cruciate ligament-injured athletes, and they are of great interest not only because of their distinct functional limitations, but also the large variability within this group. Abnormal movement patterns are common following anterior cruciate ligament injury, but strategies differ between potential copers and non-copers. During an activity as basic as walking, non-copers reduce the motion of the injured knee and increase the work done at the hip and ankle, perhaps in an effort to avoid knee instability. Non-copers limit the motion of the knee by activating several muscles around the knee simultaneously. So while this may be effective in stabilizing the knee in the short term, this strategy may cause altered and potentially harmful loading patterns within the knee joint.

The abnormal movement and altered muscle firing patterns of anterior cruciate ligament-injured athletes are believed to be a mechanism for knee osteoarthritis. Though anterior cruciate ligament reconstruction restores knee stability, surgery does not fully address the faulty movement of these individuals. Pre-operative perturbation training is effective in improving function and normalizing knee motion in some non-copers. Perturbation training does not improve the ability of all non-copers to return to sport, suggesting other patient factors may be related to post-surgical outcomes. Women are known to be at greater risk for anterior cruciate ligament injury than men, but recently poorer outcomes in women following surgery have also been found. In response to pre-operative training, women demonstrate improved function and gait symmetry, but recover much more slowly after surgery and demonstrate abnormal patterns and knee joint loads. Persistent faulty patterns in women warrants further study and our research can help us find ways for us to address these abnormalities.

This goal of this work is to determine whether perturbation training can improve knee function and reduce faulty adaptations after anterior cruciate ligament reconstruction. Specifically, the aims of this project are to investigate whether the addition of post-operative perturbation training results in lower loading, better movement patterns and better functional outcomes than standard care.