Joyce T J
Centre for Rehabilitation and Engineering Studies, School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne, UK.
J Hand Surg Eur Vol. 2009 Feb;34(1):18-24. doi: 10.1177/1753193408093808. Epub 2008 Oct 20.
Eleven fractured Sutter metacarpophalangeal prostheses were obtained from the hands of three patients. All of the implants had fractured at the junction of the distal stem and the hinge. After visual examination, the fracture faces were prepared and viewed using a scanning electron microscope. These images indicated that fracture was initiated by abrasion on the dorsal aspect of the distal stem of the prostheses, close to the hinge. Crack propagation was shown to be due to a fatigue process. Once a crack started, its direction of travel could be followed, using topographical features common to engineering fracture analyses. Propagation was from radial to ulnar and from dorsal to palmar.
从三名患者手中获取了11个骨折的萨特掌指关节假体。所有植入物均在远端柄与铰链的连接处发生骨折。目视检查后，制备骨折面并使用扫描电子显微镜观察。这些图像表明，骨折始于假体远端柄靠近铰链的背侧磨损。裂纹扩展显示是由疲劳过程导致的。一旦裂纹开始，就可以利用工程断裂分析中常见的地形特征追踪其传播方向。传播方向是从桡侧向尺侧，从背侧向掌侧。
