Dunning C E, Lindsay C S, Bicknell R T, Johnson J A, King G J, Patterson S D
Bioengineering Research Laboratory, Lawson Research Institute, Hand and Upper Limb Centre, St Joseph's Health Centre, 268 Grosvenor Street, London, Ontario, N6A 4L6 Canada.
J Hand Surg Am. 2001 Mar;26(2):218-27. doi: 10.1053/jhsu.2001.22925.
The in vitro stability of an Ilizarov hybrid external fixator was compared with that of a dorsal 3.5-mm AO T-plate in 8 unpaired, fresh-frozen upper extremities. A specially designed testing device that used computer-controlled pneumatic actuators was used to simulate active finger, wrist, and forearm motions by applying loads to relevant tendons. A comminuted extra-articular distal radius fracture was modelled using a dorsally based wedge osteotomy. Fracture stability was assessed using an electromagnetic tracking device to measure motion across the fracture site after randomized application of the plate and the hybrid fixator. During simulated finger and wrist motions with the forearm pronated or supinated, motion of the distal fragment with the hybrid fixator applied was comparable to or statistically less than with the AO plate applied. During simulated forearm rotation, the stability provided by the 2 fixation types was similar, although the plate allowed statistically less radial-ulnar deviation of the fragment. In this model of a 2-part extra-articular distal radius fracture, the clinically meaningful stability of the Ilizarov hybrid external fixator was comparable to that of the dorsal AO plate.
在8个未配对的新鲜冷冻上肢中，将伊利扎洛夫混合外固定器的体外稳定性与背侧3.5毫米AO T形钢板的体外稳定性进行了比较。使用一种专门设计的测试装置，该装置采用计算机控制的气动执行器，通过对相关肌腱施加负荷来模拟手指、手腕和前臂的主动运动。使用基于背侧的楔形截骨术模拟粉碎性关节外桡骨远端骨折。在随机应用钢板和混合固定器后，使用电磁跟踪装置评估骨折部位的运动，以此来评估骨折稳定性。在前臂旋前或旋后状态下模拟手指和手腕运动时，应用混合固定器时远端骨折块的运动与应用AO钢板时相当，或在统计学上小于应用AO钢板时。在模拟前臂旋转时，两种固定方式提供的稳定性相似，尽管钢板在统计学上使骨折块的桡尺偏角更小。在这种两部分关节外桡骨远端骨折模型中，伊利扎洛夫混合外固定器具有临床意义的稳定性与背侧AO钢板相当。
