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THE AO UNREAMED FEMORAL NAIL IN THE MANAGEMENT OF SUBTROCHANTERIC FEMORAL FRACTURES

Royal Devon and Exeter Hospital, Barrack Road, Exeter EX2 5DW

To evaluate if adequate restoration of the medial cortical buttress reduces the high reported incidence of mechanical complications when using the AO unreamed femoral nail with spiral blade (UFN-SB) in the management of subtrochanteric femoral fractures. The clinical notes and radiographs of sixty-five patients treated with the UFN-SB between November 1996 and February 1999 were retrospectively reviewed. Twenty-eight of these fractures were subtrochanteric. Mean patient age was seventy-five and thirteen patients had metastatic disease. At the time of review the patients or their doctor were contacted by telephone to establish accurately the associated morbidity and mortality. Follow up information was obtained for every patient. Post-operative radiographs were assessed for accuracy of fracture reduction.

The medial cortical buttress was adequately restored in every case. This required open fracture reduction in eleven patients and cerclage wires augmented the reduction in eight of these cases. Open reduction did not significantly increase time to fracture union or transfusion requirement. Every surviving patient was fully weight bearing within three months. One patient required a second operation for spiral blade migration but there were no implant breakages or other mechanical complications after a mean follow-up of thirty-seven months.

Conclusion: Adequate restoration of the medial cortical buttress allows the UFN-SB to function as a load-sharing device and achieves reliable skeletal stability in these potentially unstable fractures that typically occur in osteoporotic or pathological bone.

The abstracts were prepared by Mr Tim Briggs. (Editoral Secretary 2003/4) Correspondence should be addressed to him at Lane Farm, Chapel Lane, Totternhoe, Dunstable, Bedfordshire LU6 2BZ, United Kingdom