Fractures of allografts used in limb preserving operations.

One hundred and thirty-seven allografts used since 1986 in limb preserving operations for malignant bone tumours were reviewed. The follow up was longer than two years. There were fourteen fractures (10.2%) in twelve patients at a mean time of 22 months from the operation. Most of them were in the metaphyseal area and were related to perforations of the allograft made for stabilisation with plates, for tendon and ligament reattachment, or any other hole in the allograft. Fractures occurred always after the allograft-host junction was united. Healing was achieved in 7 cases by internal fixation with autologous bone grafting in a mean of 5 months. In cases of multiple fractures of the allograft, the graft was exchanged. We recommend using intramedullary fixation in order to reduce the incidence of allograft fracture, and the use of internal fixation, with intramedullary whenever possible, and autologous bone grafting to achieve consolidation of the fractures.