Hypertrophic non-union of a pathological forearm fracture secondary to multiple myeloma: a case report

Skeletal lesions in multiple myeloma are predominantly lytic and when non-union of pathological fractures occur it is typically atrophic. We report a lady of 61 years of age with myeloma who presented with a pathological fracture through an ulnar myeloma deposit. The fracture was immobilised initially then irradiated. Nine months later she re-presented with marked forearm pain particularly on rotation. Radiographs demonstrated a hypertrophic non-union of a pathological fracture with a typical elephant's hoof appearance. The fracture was immobilised using an ulnar nail. Whilst non-unions in metastatic malignancy are typically atrophic, just occasionally hypertrophic non-unions can occur. Management principles remain the same with stabilisation of the entire bone and early mobilisation being appropriate.