PURPOSE To compare the results of anterior cruciate ligament (ACL) reconstructions using either a patella-tendon autograft or a semitendinosus-tendon autograft. METHODS Based on surgeon experience and preference, 68 patients underwent ACL reconstruction using either a quadruple-strand semitendinosus autograft (n = 34) or a central one-third bone-patella tendon-bone autograft (n = 34). Each pa...

background: tibial avulsion fractures of the posterior cruciate ligament are not infrequent. however, controversies exist between the fixation of the fragments and their reconstruction in the cases with small bony fragments. this prospective study was undertaken to study the results after fixation of the fragments by the malleolar screw and the pull through suture techniques.   methods: from ju...

This study investigated the effects of anterior knee joint laxity on muscle activation patterns prior to and following a lower extremity perturbation. Participants were subjected to a forward and either internal (IR) or external (ER) rotation perturbation of the trunk and thigh on the weight-bearing shank. Pre-activity (%MVIC) before the perturbation, and reflex time (ms) and mean reflex amplit...

The purpose of this study was to evaluate prospectively the arthroscopic findings in the lateral compartment of knees with posterolateral knee complex injuries, to help identify individual injured anatomic structures, and to assist in the clinical identification of these injuries. Thirty of 33 consecutive knees noted to have grade 3 posterolateral knee complex injuries on preoperative evaluatio...

Verified and efficient representations of knee ligamentous constraints are essential to forward-dynamic models for prediction of knee mechanics. The objectives of this study were to develop an efficient probabilistic representation of knee ligamentous constraint using the advanced mean value (AMV) probabilistic approach, and to compare the AMV representation with the gold standard Monte Carlo (...

OBJECTIVE To determine the reproducibility of frontal plane knee joint laxity measurement through the assessment of intra- and inter-rater reliability coefficients and intra- and inter-rater agreement coefficients. METHODS Two raters independently assessed the laxity of the knee joint in the frontal plane by three repeated measurements. Fourteen days later the assessment was repeated. Complet...

Background: Improved knowledge of in vivo function the collateral ligaments is essential for enhancing rehabilitation and guiding surgical reconstruction as well soft-tissue balancing total knee arthroplasty. The aim this study was to quantify elongation patterns throughout complete cycles functional activities. Methods: Knee kinematics were measured using radiographic images captured with a mo...

Pre-operative clinical examination revealed no neurovascular deficit, but was limited due to significant pain and patient reluctance to participate in range of motion. Radiographs showed an intraarticular fracture of the posterior aspect of the right tibial spine with the dominant fragment displaced approximately 1 cm posteriorly in the joint space. Computed Tomography (CT) verified a 1 cm frag...

The assessment of the shoulder anterior-posterior laxity has been performed using an instrumented mechanical device. The anterior-posterior translation measurement facilitates the generation of normative data of non-pathologic shoulders in a healthy population. The descriptive laboratory study has also investigated the impact of gender and exercise frequency on shoulder laxity. The glenohumeral...

We analyzed the results of eleven shoulders in ten patients who had a bone block procedure for recurrent posterior shoulder instability after extensive conservative treatment had failed. Five patients had posterior instability with additional laxity in another direction (UPI+), and five patients had unidirectional posterior instability without additional laxity (UPI-). After a median follow-up ...