Cotton D W, Whitehead C L, Vyas S, Cooper C, Patterson E A
Department of Pathology, University of Sheffield, Medical School, UK.
Forensic Sci Int. 1994 Mar 25;65(2):105-12. doi: 10.1016/0379-0738(94)90265-8.
The distribution of stress in the heads of femurs has been assessed using an engineering technique known as photoelastic stress analysis. The aim of the investigation was to locate and evaluate the probable sites of structure failure in femurs with various axes of loading. The analysis shows that the maximum stress in the upper femur occurs in the cervical region during vertical loading. Lateral loading does not produce significant stress patterns at the sites of extracapsular hip fracture. It is concluded that cervical hip fractures in individuals suffering from osteoporosis result from a combination of fatigue damage and axial muscular compression, rather than forces generated by a fall. This has significance for the medico-legal interpretation of the cause of death following femoral neck fracture.
使用一种名为光弹性应力分析的工程技术评估了股骨头部的应力分布。该研究的目的是确定并评估不同加载轴的股骨中可能发生结构破坏的部位。分析表明，在垂直加载过程中，股骨上段的最大应力出现在颈部区域。外侧加载在髋关节囊外骨折部位不会产生明显的应力模式。得出的结论是，骨质疏松患者的颈椎髋部骨折是疲劳损伤和轴向肌肉压缩共同作用的结果，而非跌倒产生的力所致。这对于股骨颈骨折后死亡原因的法医学解释具有重要意义。
