Background: The focus of most anterior cruciate ligament reconstructions has been on replacing the anteromedial bundle and not posterolateral bundle. Hypothesis: Anatomic two-bundle reconstruction restores knee kinematics more closely to normal than does single-bundle reconstruction. Study Design: Controlled laboratory study. Methods: Ten cadaveric knees were subjected external loading conditions: 1) a 134-N tibial load 2) combined rotatory 5-N·m internal torque 10-N·m valgus torque....

The role of the meniscus in load transmission across knee has long been a subject debate. In this study, we examined biomechanical consequences operative treatments for bucket-handle and peripheral meniscal tears. Contact areas instantaneous intraarticular pressure distributions were measured two groups human cadaver knees. Group I, consisting four knees, created tear involving inner one-third meniscus, followed by partial, then total meniscectomy. Knees tested an Instron testing machine...

Rehabilitation continues to evolve with the increased emphasis on patient management and proprioceptive training. Proprioception can be defined as a specialized variation of sensory modality touch that encompasses sensation joint movement (kinesthesia) position (joint sense). Numerous investigators have observed afferent feedback brain spinal pathways is mediated by skin, articular, muscle mechanoreceptors. Examining effects ligamentous injury, surgical intervention, proprioceptively...

The purpose of the present study was to demonstrate reliability, validity, and responsiveness Activities Daily Living Scale Knee Outcome Survey, a patient-reported measure functional limitations imposed by pathological disorders impairments knee during activities daily living. comprised 397 patients; 213 were male, 156 female, gender not recorded for remaining twenty-eight. mean age patients 33.3 years (range, twelve seventy-six years). referred physical therapy because wide variety knee,...

Abstract The anterior cruciate ligament has a complex fiber anatomy and is not considered to be uniform structure. Current reconstructions succeed in stabilizing the knee, but they neither fully restore normal knee kinematics nor reproduce ligament, function. To improve outcome of reconstruction, it may necessary function intact replacement graft. We examined situ forces nine human ligaments as well force distribution between anteromedial posterolateral bundles response applied anterioi...

The authors conducted a study to determine if the long head of biceps muscle and its attachment at superior glenoid labrum play role in stability shoulder an overhead position. Their used dynamic cadaveric model that simulated forces rotator cuff muscles as glenohumeral joint was abducted externally rotated. data suggest contributes anterior by increasing shoulder's re sistance torsional vulnerable rotated also helps diminish stress placed on inferior gle nohumeral ligament. Detachment noid...

Background: The objective of this study was to evaluate the effectiveness reconstructions anterior cruciate ligament resist tibial and rotational loads. We hypothesized that current reconstruction techniques, which are designed mainly provide resistance loads, less effective in limiting knee instability response combined Methods: Twelve fresh-frozen young human cadaveric knees (from individuals with a mean age [and standard deviation] 37 ± 13 years at time death) were tested use...

Johnny Huard, PhD; Yong Li, PhD, MD; Growth and Development Laboratory, Children's Hospital of Pittsburgh, 4151 Rangos Research Center, 3705 Fifth Avenue, PA 15213. E-mail address for J. Huard: [email protected] Freddie H. Fu, Department Orthopaedic Surgery, University Pittsburgh Medical Liliane S. Kaufmann Building, 3471 Suite 1010, 15213

A rupture of the entire fibers anterior cruciate ligament leads to knee instability due increased tibial translation and internal rotation. The influence isolated deficiency anteromedial or posterolateral bundle on resulting kinematics have not yet been reported.Transection will lead at 90 degrees. Transection show an as well a combined rotatory 30 degrees.Controlled laboratory study.Kinematics intact were determined in response 134-N load 10 N.m valgus 4 rotation using robotic/universal...

A computerized neuropsychological test battery was conducted to evaluate memory dysfunction and self-reporting of symptoms in a group high school athletes who had suffered concussion.Neuropsychological performance prior following concussion compared with the an age-matched control group. Potentially important diagnostic markers severity are discussed linked recovery within 1st week injury.High mild demonstrated significant declines processes relative noninjured Statistically differences...

Anterior cruciate ligament injuries are occurring at a higher rate in female athletes compared with their male counterparts. Research the area of anterior injury has increasingly focused on role joint proprioception and muscle activity promoting knee stability. We measured laxity, kinesthesia, lower extremity balance, amount time required to generate peak torque flexor extensor musculature, electromyographically assessed 34 healthy, collegiate-level (average age, 19.6 1.5 years) who played...

This study evaluated kinematic, vertical ground reaction forces, and strength variables in healthy collegiate female basketball, volleyball, soccer players compared with matched male subjects. Thirty athletes did single-leg landing forward hop tasks. An electromagnetic tracking device synchronized a force plate provided kinematic data data, respectively. Maximum angular displacement time to maximum were calculated for hip flexion, abduction, rotation, knee lower leg rotation. Vertical...

We did a retrospective review and follow-up examination to investigate the incidence, risk factors, outcome of patients who developed loss motion after arthroscopic anterior cruciate ligament reconstruction. Two hundred forty-four with minimum followup 1 year were reviewed. Loss (defined as extension more than 10 degrees or flexion less 125 degrees) was identified in 27 for an overall incidence 11.1%. Factors associated included acute reconstruction (less month from initial injury), male...

Abstract The incidence of meniscal tears in the chronically anterior cruciate ligament‐deficient knee is increased, particularly medial menicus because it performs an important function limiting motion. We evaluated role meniscus stabilizing and hypothesized that resultant force significantly elevated knee. To test this hypothesis, we employed a robotic/universal force‐moment sensor testing system to determine increase human response tibial load following transection ligament. also measured...

The human knee joint represents a complex biomechanical system of which the menisci are an integral component. At present, little data exists describing meniscal kinematics intact knee. Accordingly, three-dimensional reconstruction magnetic resonance image model was used to explore this issue. Five fresh cadaveric knees were examined by imaging throughout full range motion at 10 degrees intervals. Computer images generated and evaluated for anteroposterior excursion deformation. During...

Background The interest in double-bundle anterior cruciate ligament (ACL) reconstructions has recently reawakened. Hypothesis center of the femoral posterolateral (PL) bundle and anteromedial (AM) are not within same plane change their orientation throughout passive knee flexion. Additionally, tibial AM is aligned with horn lateral meniscus PL lies at recommended tunnel position for single-bundle ACL reconstruction reconstruction, 7 to 9 mm posterior ligament. Study Design Descriptive...