Abstract
The breakage of two plates and one lag screw of Dynamic Hip Screws (AOR) was analyzed. Radiological examination showed technically inadequate internal fixation in one case and potentially unstable internal fixation in the other despite adequate reduction. In the case with breakage of a lag screw fracture reduction was unsuccessful and the fragments were stabilized in malalignment. Metallurgical analysis showed that fatigue breakages caused by corrosion had occurred in all cases and that high local tensile stresses generated by poor internal fixation had led to implant failure. Plate breakages were found to be due to mechanical damage in the screw holes. From these crevice corrosion started. In all three cases metallurgical analysis ruled out material faults, which had originally been thought to be the underlying factor. Only metallurgical analysis can provide conclusive evidence of the actual cause of failure.
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