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Dynamic Function After Anterior Cruciate Ligament Reconstruction with Autologous Patellar Tendon

Charles A. Bush-Joseph, MD^*,, Debra E. Hurwitz, PhD^*, Rhohita R. Patel, MS^*,, Yersin Bahrani, Ralph Garretson, MD^*, Bernard R. Bach, Jr., MD^* and Thomas P. Andriacchi, PhD^||

^* Department of Orthopedic Surgery, Rush-Presbyterian–St. Luke’s Medical Center, Chicago, Illinois
Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
Dominican University, Maywood, Illinois
^|| Department of Mechanical Engineering/Functional Restoration, Stanford University, Stanford, California

Address correspondence and reprint requests to Charles A. Bush-Joseph, MD, Rush-Presbyterian–St. Luke’s Medical Center, 1725 West Harrison, Suite 1063, Chicago, IL 60612

The purpose of this study was to dynamically assess the functional outcome of patients who had undergone successful anterior cruciate ligament reconstruction using an autologous patellar tendon technique and to determine whether their dynamic knee function was related to quadriceps and hamstring muscle strength. The knee kinematics and kinetics of 22 subjects who had undergone anterior cruciate ligament reconstruction (mean age, 27 ± 11 years) and of 22 age- and sex-matched healthy control subjects were determined during various dynamic activities using a computerized motion analysis and force plate system. The differences in the sagittal plane angles and external moments between the two groups during light (walking), moderate (climbing and descending stairs), and higher-demand (jogging, jog and cut, jog and stop) activities were related to isokinetic strength measurements. Although patients who are asymptomatic and functioning well after anterior cruciate ligament reconstruction can perform normally in light activities, higher-demand activities reveal persistent functional adaptations that require further study.

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