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The testing position for hip-joint prostheses proposed in DIN 58840 was compared with a testing position better adapted to the real stress situation, and possible effects studied. A load and movement analysis was carried out, and the respective position at which maximum impact loads occur was analysed. After the dynamic test, the results of the loads to be borne are presented for the testing position in accordance with DIN 58840 and that adapted to the real load in the case of two types of prostheses on the basis of Wöhler diagrams. The lateral stem stresses were then determined analytically. In the statistical assessment of the fracture analysis of prostheses broken in vivo, the directions of crack propagation were found to be in accordance with those of prostheses broken under dynamic loading, in particular in the case of the testing position adapted to the real stress situation.

biomedizinische technik

Einfluß der überlagerten Beanspruchung von Hüftgelenken in der Sagittalebene auf die Ermüdungseigenschaften - The Influence of Superimposed Stress on Hip-Joints Sterns in the Sagittal Plane on the Fatigue Properties