Change in carpal arch width (CAW) is associated with wrist movement, carpal tunnel release, or therapeutic tunnel manipulation. This study investigated the angular rotations of the distal carpal joints as the CAW was adjusted. The CAW was narrowed and widened by 2 and 4 mm in seven cadaveric specimens while the bone positions were tracked by a marker-based motion capture system. The joints main...

Whole-arm motor tasks performed by nonhuman primates have become a popular paradigm to examine neural activity during motor action, but such studies have traditionally related cell discharge to hand-based variables. We have developed a new robotic device that allows the mechanics of the shoulder and elbow joints to be manipulated independently. This device was used in the present study to exami...

Introduction Functional methods of finding joint axes of rotation involve tracking the movement of one bone at a joint relative to another and subsequent calculation of the joint axis position and orientation from the locations of skinmounted markers. van den Bogert et al. [1] proposed a functional method of deter-mining the non-weight bearing axes of the ankle joint complex. Their subjects per...

OBJECTIVES Cadaveric models of the shoulder evaluate discrete motion segments using the glenohumeral joint in isolation over a defined trajectory. The aim of this study was to design, manufacture and validate a robotic system to accurately create three-dimensional movement of the upper body and capture it using high-speed motion cameras. METHODS In particular, we intended to use the robotic s...

Analysis of hand kinematics is important in several application areas, such as rehabilitation, sports and ergonomics. In particular, ambulatory tracking of the whole hand configuration is valuable for kinematic assessment under daily life conditions. Current instrumented glove systems primary use resistive, magnetic or optical sensing methods [1]. A common drawback of these systems is that the ...

The unique musculoskeletal structure of the human hand brings in wider dexterous capabilities to grasp and manipulate a repertoire of objects than the non-human primates. It has been widely accepted that the orientation and the position of the thumb plays an important role in this characteristic behavior. There have been numerous attempts to develop anthropomorphic robotic hands with varying le...

In the present work a methodology of metrological kind is suggested. The procedure has been developed to give information on the relative quality between two or more standard sets of Rzeppa joints made up by different factories. The methodology suggested is based on dimension and hardness evaluations. The main aim of the dimensional evaluations is the tolerances check that characterize the groo...

Abstract An analytical method for calculation of local stresses in double-sided butt welded joints at misalignment welds’ axes is developed. The applicable thin-gauge plates with different geometry welds on the face and root sides under tensile load. In given example, it was shown that reach their maximum value zone transition from weld to base metal which farther axis weld. results calculation...

Artificial articular joints present an interesting, and difficult, tribological problem. These bearing contacts undergo complex transient loading and multi axes kinematic cycles, over extremely long periods of time (>10 years). Despite extensive research, wear of the bearing surfaces, particularly metal-metal hips, remains a major problem. Comparatively little is known about the prevailing lubr...