144 PERIPROSTHETIC FEMORAL FRACTURES: MANAGEMENT AND OUTCOME

Abstract

Objectives: Retrospective case control study of management and outcome of periprosthetic femoral fractures, from the lower limb reconstruction unit in Exeter.

Material and Methods: 144 fractures over a period of 20 years were reviewed. The Vancouver classification system wasd used to clasify the fractures. The prosthesis length was measured pre and post-peratively. The use of impaction grafting technique for inadequate bone quality of the surrounding bone was assessed (type B3 fractures). The use of Dall/Miles, DCP and Mennen plates was also assessed. Healing was defined using radiological and clinical criteria and where available the Harris Hip Score. Chi-square test with p< 0.05 was used for the statistical analysis of the Results:

Results: When the Vancouver system was applied 2.85% of the fractures were classified as type A, 87.2% as type B and 10% as type C. Within the type B group 13.2% were subtype B1, 12% subtype B2 and 62% subtype B3. 1 out of 6 Mennen, 4 out of 16 Dall/Miles and 2 out of 20 DCP plates failed. Overall 68% healing, 5% non-union, 4% infection, 23% re-fracture rate at 12 months follow-up. Better healing was achieved when impaction grafting was used for B3 fractures (p=0.001). Better healing was achieved when the revision stem was bypassing the most distal fracture line by at least 2 ipsilateral femoral diameters and impaction grafting was used for B3 fractuires (p=0.01).

Conclusion: Impaction Grafting can compensate for the inadequate bone in type B3 fractures and appears to promote union. Revision stem should bypass the most distal fracture line by at least 2 cortical diameters to achieve healing.