In Vivo Radiocarpal Kinematics and the Dart Throwerʼs Motion

Abstract

The dart thrower's path defined the transition between flexion and extension rotation of the scaphoid and lunate, and it identified wrist positions at which scaphoid and lunate motion approached zero. These findings indicate that this path of wrist motion confers a unique degree of radiocarpal stability and suggests that this direction, rather than the anatomical directions of wrist flexion-extension and radioulnar deviation, is the primary functional direction of the radiocarpal joint.

A digital database of wrist bone anatomy and carpal kinematics

“…This distribution of positions resulted from the error associated with using a protractor device to define wrist position. Therefore, when wrist position is defined anatomically as the orientation of the capitate with respect to the radius (Crisco et al, 2005a), the 16 targeted wrist positions actually yielded 520 different wrist positions.…”

“…They have used the technique to evaluate knee motion after anterior cruciate ligament reconstruction (Tashman et al, 2004), and to estimate articular cartilage behavior during dynamic loading from proximity maps of the subchondral bone . Other investigators have used serial CT scanning and markerless registration techniques to analyze carpal (Crisco et al, 2005a;Feipel and Rooze, 1999;Moojen et al, 2002) and forearm bone motion (Moore et al, 2002) as the hand is positioned in 3-D space. Markerless carpal bone registration has also been performed using serial images acquired via magnetic resonance imaging (Moritomo et al, 2004).…”

Chronic Scapholunate Ligament Injury

“…[4][5][6] This in vivo 3-dimensional computed tomography scan evaluation documented the position of the carpus with axial loading in extremes of motion and provided further insight into the ligamentous and bony constraints that often lead to the characteristic patterns of both ligamentous and combined bony and ligamentous injury. The DTM confers a degree of agility and fluidity when performing daily and recreational tasks but also may provide stability by reducing midcarpal motion.…”

Length changes of scapholunate interosseous ligament at different wrist positions: an in vivo 3-dimension image study

“…Moojen et al [17], Crisco et al [8], Chen et al [5,6], and Tan et al [25] have used this method to study carpal motion or length changes of the wrist ligaments during wrist motion. The reliability and accuracy of this technique have already been proven [14].…”