Gierse H
Z Orthop Ihre Grenzgeb. 1977 Jun;115(3):363-8.
The calcaneus is generally stressed by bending. Spongious bone has a trajectorial structure, and is adapted to the stress to an optimal degree. In fatigue fractures, the dense zone runs perpendicularly to the compressive bundles of the spongious bone. Presuming a mechanical genesis, the sclerotic band is expected to run rectangularly to the tensile bundles. This mechanical condition can be performed in a photoelastic experiment. The proof of the presence of a similar mechanical situation during movement of the foot may be derived from electromyygraphic examinations (Mac Conaill 1969, Basmajian 1974). The appearance of these fractures shows that the time is too short to allow the bone to adapt functionally. It may be concluded from this, that the cause of the fracture is a sudden, sharp increase in exercise.
跟骨通常因弯曲而受力。松质骨具有骨小梁结构，并能以最佳程度适应应力。在疲劳性骨折中，致密带垂直于松质骨的压缩束。假定为机械成因，硬化带预计与拉伸束呈直角。这种力学状况可在光弹性实验中实现。足部运动过程中存在类似力学情况的证据可从肌电图检查中得出（麦克康奈尔1969年，巴斯马吉安1974年）。这些骨折的表现表明，时间太短，骨骼无法进行功能适应。由此可以推断，骨折的原因是运动突然急剧增加。
