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[Treatment of benign bone lesions of proximal femur using dynamic hip screw and intralesional curettage via Watson-Jones approach].

Objective: To explore the effectiveness of dynamic hip screw (DHS) and intralesional curettage via Watson-Jones approach in treatment of benign bone lesions of the proximal femur.

Methods: Between March 2012 and December 2016, 20 patients (21 lesions) with benign bone tumors or tumor like conditions of proximal femurs were treated with DHS and intralesional curettage via Watson-Jones approach. Their average age was 27.8 years (range, 11-51 years), including 13 males and 7 females. The pathological diagnosis were fibrous dysplasia in 11 cases, simple bone cyst in 2 cases, aneurysmal bone cyst in 2 cases, benign fibrous histocytoma in 2 cases, giant cell tumor in 2 cases, and chondroblastoma in 1 case, including 3 pathological fractures. According to the Enneking staging system, 18 patients were in stage S1, 3 patients with pathological fractures in stage S2. There was no varus deformity or valgus deformity. The operation time, intraoperative blood loss, and time of full weight-bearing were recorded. X-ray film and CT were used to observe the bone graft fusion and location of DHS. Complications were recorded. Visual analogue scale (VAS) and Musculoskeletal Tumor Society (MSTS) scoring were used to evaluate function of lower limbs.

Results: The average operation time was 177.1 minutes (range, 110-265 minutes). The average intraoperative blood loss was 828.6 mL (range, 200-2 300 mL). There was superficial incision infection in 1 case, deep incision infection in 1 case, and hip discomfort in 1 case, respectively. All patients were followed up 6-63 months (mean, 27.4 months). The time of full weight-bearing was 2 days in 2 patients with giant cell tumor and 2 to 13 weeks with an average of 7.2 weeks in the other patients. At last follow-up, VAS and MSTS were 0.19±0.51 and 29.62±0.97 respectively, showing significant differences when compared with the values before operation (3.52±2.62 and 23.71±8.77) ( t =5.565, P =0.000; t =-3.020, P =0.007 ). X-ray film showed the all bone grafts fusion with mean time of 8.2 months (range, 5-12 months). There was no pathological fracture of the femur, local tumor recurrence, chronic hip pain, dislocation, or femoral head necrosis during follow-up.

Conclusion: The treatment of benign bone lesion of the proximal femur using DHS and intralesional curettage via Watson-Jones approach is a safe and effective method.

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