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Type 316LR stainless steel screws that failed by fatigue were studied. It was found that fatigue fracture can occur on different thread levels, depending on the loading situation. The initiation of secondary fatigue cracks was occasionally found parallel to the fracture plane. The screws were used with a relatively rigid plate to treat a fracture complication in the upper end of the femur. The fatigue failures were explained by signs of unstable fixation revealed by radiographs.

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