Four cases of breakage of Küntscher intramedullary nails (AO model) are presented. All 4 nails broke after fracture healing had occurred and all 4 presented breakage of the stem in the same site. In these cases breakage of the nails is not due to instability of the fracture, but always derives from superficial micro-cracks, technologically inevitable, due to defects or irregularities in the metal that expand during load application.
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