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BACKGROUND The pivot shift is a dynamic test of knee stability that involves a pathologic, multiplanar motion path elicited by a combination of axial load and valgus force during a knee flexion from an extended position. PURPOSE To assess the stabilizing effect of the medial and lateral meniscus on anterior cruciate ligament-deficient (ACL-D) knees during(More)
BACKGROUND Biomechanical differences between anatomical double-bundle and central single-bundle anterior cruciate ligament reconstruction using the same graft tissue have not been defined. PURPOSE The purpose of this study was to compare these reconstructions in their ability to restore native knee kinematics during a reproducible Lachman and pivot-shift(More)
We aimed to quantify the effect of changes in tibial slope on the magnitude of anterior tibial translation (ATT) in the anterior cruciate ligament (ACL)-deficient knee during the Lachman and mechanized pivot shift tests. We hypothesized that increased posterior tibial slope would increase the amount of ATT of an ACL-deficient knee, while leveling the slope(More)
Intraoperative two-dimensional (2D) fluoroscopy of acetabular fractures is difficult due to the complex three-dimensional (3D) anatomy. Intraoperative 3D fluoroscopy may have particular utility in the evaluation of acetabular fractures. We compared the accuracy of 3D fluoroscopic imaging in evaluating acetabular fracture displacement and implant placement(More)
AIM To evaluate and compare the accuracy of using the femoral neck axis and the greater trochanter with navigation to determine femoral anteversion. METHODS Eight human femora with midshaft fractures were used. Real anteversion (AV) values were first measured on a movable fixation system, with digital images imported to software. Second, a navigation(More)
BACKGROUND Minimal attention has been directed toward tibial tunnel position and the native tibial anterior cruciate ligament (ACL) footprint. PURPOSE To evaluate the effect of tibial tunnel position on restoration of knee kinematics and stability after ACL reconstruction. STUDY DESIGN Controlled laboratory study. METHODS Ten paired cadaveric knees(More)
Anterior translation of the lateral compartment was hypothesized to correlate with the clinical grade of a pivot shift maneuver. Using a computer-assisted navigation system, this hypothesis was tested by recording the maximum anterior tibial translation in the medial and lateral compartment as well as the arc of rotation during the pivot shift maneuver. One(More)
The difficulty in assessing femoral rotation during intramedullary nailing is well-established. Navigation systems allow the surgeon to detect and set the version of the injured leg at the desired angle. We report the first cases of navigated femoral nailing using noninvasive registration of the contralateral uninjured leg to determine the patient's(More)
The purpose of this study was to correlate clinical pivot shift grading with femoral condyle size as measured on pre-operative magnet resonance imaging (MRI) of patients with anterior cruciate ligament (ACL) injury. Forty-nine consecutive patients for anterior cruciate ligament (ACL) surgery were examined under anesthesia. The pivot shift was graded(More)
The menisci are known to be important secondary constraints to anterior translation of the tibia in the ACL-deficient knee. The effect of meniscal loss on knee stability as measured by the magnitude of the pivot shift following ACL reconstruction is unknown. The objective of this investigation was to determine the effect of meniscectomy on knee stability(More)