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University of Chicago, Section of Orthopaedics and Rehabilitation Medicine, Department of Surgery, Chicago, Illinois
* Address correspondence and reprint requests to Louis F. Draganich, PhD, The University of Chicago, Section of Orthopaedics and Rehabilitation Medicine, Department of Surgery, 5841 South Maryland Avenue/MC 3079, Chicago, IL 60637
Patellofemoral pain may be associated with anterior cruciate ligament deficiency or may occur after anterior cruciate ligament reconstruction. We investigated the effects of the removal and reconstruction of the anterior cruciate ligament on the kinematics of the tibiofemoral and patellofemoral joints during physiologic levels of quadriceps muscle loads in seven cadaveric knees. A bone-patellar tendon-bone graft was used for intraarticular reconstruction of the anterior cruciate ligament. The spatial positions of the tibiofemoral and patellofemoral joints were measured between 0° and 90° of knee flexion in 15° increments with a six degree-of-freedom digitizing system. Excision of the anterior cruciate ligament resulted in statistically significant increases in anterior tibial translation between 0° and 90° and valgus tibial rotation between 30° and 90°; intraarticular reconstruction returned these to levels not significantly different from those of the intact knee. Excision of the anterior cruciate ligament resulted in significant increases in lateral patellar tilt, ranging from 6.3° to 9.0° between full extension and 90° of knee flexion, and in lateral patellar shift, ranging from 2.9 mm at 15° of knee flexion to 5.9 mm at 90°; intraarticular reconstruction returned these to levels not significantly different from those of the intact knee. Neither removal nor reconstruction of the anterior cruciate ligament significantly affected tibial internal-external rotation, patellar flexion, patellar mediolateral rotation, patellar anteroposterior translation, or patellar proximodistal translation.
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