Segmental motion of forefoot and hindfoot as a diagnostic tool.

Segmental motions derived from non-invasive motion analysis are being used to investigate the intrinsic functional behavior of the foot and ankle in health and disease. The goal of this research was to examine the ability of a generic segmented model of the foot to capture and differentiate changes in internal skeletal kinematics due to neuromuscular disease and/or trauma. A robotic apparatus that reproduces the kinematics and kinetics of gait in cadaver lower extremities was employed to produce motion under normal and aberrant neuromuscular activation patterns of tibialis posterior and/or tibialis anterior.

Midtarsal joint locking: new perspectives on an old paradigm.

We investigated the existence of a midtarsal joint locking mechanism using cadaveric simulations of normal gait. Previous descriptions of this phenomenon led us to hypothesize that non-coupled rotations of the calcaneocuboid and talonavicular (i.e.

Muscle activity patterns of the tensor fascia latae and adductor longus for ramp and stair walking.

Walking on both outdoor and indoor surfaces requires the ability to negotiate connections between vertical distances, simply known as hills and stairs. Therefore, the purpose of the present study was to evaluate the muscle activity patterns of the TFL and ADL during both hill and stair walking. We hypothesized that TFL and ADL activity during initial swing, initial stance, and late stance of up-ramp and up-stair walking would be greater than level walking.

Cortical and trabecular bone, bone mineral density, and resistance to ex vivo fracture are not altered in response to life-long vitamin A supplementation in aging rats.

High vitamin A (VA) intakes have been correlated with increased risk of bone fracture. Over 50% of the U.S.

A biomechanical study of posterior glenoid bone loss and humeral head translation.

Background: Results of shoulder arthroplasty have been reported to be inferior with posterior glenoid wear and accompanying subluxation of the humeral head. The purpose of this study was to examine the effect of posterior glenoid wear on posterior subluxation of the humeral head.

Material And Methods: A custom loading device was used to simulate physiologic loading conditions in 8 cadaver shoulders with the humerus positioned at neutral, forward flexion, and extension.

Reliability and validity of a novel muscle contusion device.

Context: Many models have been employed to replicate skeletal muscle injury associated with trauma; however, most are restricted to 1 level of severity.

Objective: To create and validate an injury-producing device that could generate multiple levels of injury severity.

Design: Validation study.

An objective evaluation of a segmented foot model.

Segmented foot and ankle models divide the foot into multiple segments in order to obtain more meaningful information about its functional behavior in health and disease. The goal of this research was to objectively evaluate the fidelity of a generalized three-segment foot and ankle model defined using externally mounted markers. An established apparatus that reproduces the kinematics and kinetics of gait in cadaver lower extremities was used to independently examine the validity of the rigid body assumption and the magnitude of soft tissue artifact induced by skin-mounted markers.