Bronstein A J, Trumble T E, Tencer A F
Harborview Biomechanics Laboratory, Seattle, WA 98104, USA.
J Hand Surg Am. 1997 Mar;22(2):258-62. doi: 10.1016/S0363-5023(97)80160-8.
Seven fresh cadaveric specimens were used to determine the loss of forearm rotation with varying distal radius fracture malalignment patterns. Uniplanar malunion patterns consisting of dorsal tilt, radioulnar translation, or radial shortening were simulated by creating an osteotomy at the distal end of the radius, orienting the distal fragment position using an external fixator, and maintaining the position with wedges and a T-plate. Rotation of the forearm was produced by fixing the elbow in a flexed position and applying a constant torque to the forearm using deadweights. Forearm rotation was measured with a protractor. Dorsal tilt to 30 degrees and radial translation to 10 mm led to no significant restriction in forearm pronation or supination ranges of motion. A 5-mm ulnar translation deformity resulted in a mean 23% loss of pronation range of motion. Radial shortening of 10 mm reduced forearm pronation by 47% and supination by 29%.
使用七个新鲜尸体标本,以确定不同桡骨远端骨折畸形愈合模式下前臂旋转功能的丧失情况。通过在桡骨远端进行截骨术、使用外固定器确定远端骨折块位置,并使用楔形物和T形钢板维持该位置,模拟由背侧倾斜、桡尺侧移位或桡骨短缩组成的单平面畸形愈合模式。将肘部固定于屈曲位,使用重物对前臂施加恒定扭矩,以使前臂产生旋转。使用量角器测量前臂旋转情况。背侧倾斜30度和桡侧移位10毫米对前臂旋前或旋后活动范围无显著限制。尺侧移位畸形5毫米导致旋前活动范围平均丧失23%。桡骨短缩10毫米使前臂旋前减少47%,旋后减少29%。