Effects of Lumbosacral Joint Mobilization/Manipulation on Lower Extremity Muscle Neuromuscular Response

The purpose of this study is to gain a better understanding of the effects of lumbopelvic manual therapy on lower extremity biomechanics and arthrogenic muscle response. As a result of this study, we also hope that physical therapists, athletic trainers, and other physical medicine rehabilitation providers will gain a better understanding of lower extremity injuries and have the scientific evidence to provide patients with techniques which would allow for efficient return to activities of daily living without restrictions and possibly prevent future injuries and minimize risk of osteoarthritis. The objectives of this study are to: * Determine the amount and duration of arthrogenic muscle response of quadriceps muscles following lumbopelvic joint manipulation. * Determine the effects of lumbopelvic joint manipulation on temporospatial parameters of gait such cadence, step length, velocity and mean peak lower extremity joint moments. * Determine if a correlation exists between patellofemoral joint pain and lumbopelvic joint dysfunction. * Determine the amount of change in clinical outcome measure scores following lumbopelvic joint manipulation.