We treated two cases with non-union of the humerus using a spiral pin. In one case, a woman aged 73 with non-union of the hemeral shaft, solid union was obtained 6 months after operation. In the other case, a woman aged 74 with non-union of the surgical neck, her symptoms have subsided 15 weeks after operation, although good callus formation is obscure. The humerus was atrophic and weakened in both cases. In such cases, no methods seem to provide rigid fixation. Intramedullary fixation with a spiral pin provides more stable fixation rather than a smooth pin such as a Rush pin does, and it's not bulky unlike a Küntscher nail, so it facilitates bone grafting with or without an additional fixation. We consider that intramedullary fixation with a spiral pin is not the best but a good method for treatment of non-union of the humerus which is atrophic and weakened.
