Treatment of pathologic femoral neck fractures with modified Pauwels' osteotomy.

UNLABELLED: Treatment of pathologic femoral neck fractures secondary to extensive lesions of fibrous dysplasia and simple bone cysts has been controversial. We think that modified Pauwels' intertrochanteric osteotomy and osteosynthesis can result in sound healing of the lesion and of the fracture, with no recurrence, low complication rates, and good functional results. Seven patients were treated with a uniform approach consisting of biopsy (Stage I) and osteotomy with osteosynthesis (Stage II). Curettage of the lesion and bone grafting were not done. The average followup was 79.28 months (range, 32-142 months). All of the fractures and osteotomy sites healed in means of 14 weeks (range, 12-16 weeks) and 9.1 weeks (range, 8-10 weeks), respectively. All fibrous dysplasia lesions healed radiologically. Grade IV radiographic healing was seen in both patients with simple bone cysts after 35 and 92 months. Using the Musculoskeletal Tumor Society functional evaluation and Toronto Extremity Salvage Score, all the patients had good to excellent results. Complications such as infection, local recurrence, refracture, femoral neck deformity, osteonecrosis of the femoral head, and growth arrest of capital femoral physis were not seen. In addition to biomechanical advantages, the procedure seems to have had a biologic role in healing of the fracture and of the lesion by initiating osteogenesis to replace the defect with new bone.

LEVEL OF EVIDENCE: Therapeutic study, Level IV (case series--no, or historical control group). See the Guidelines for Authors for a complete description of levels of evidence.