[Clinical research of accurate limb length equalization in total hip arthroplasty].

Objective: To explore the effective method and the feasibility of the accurate limb length equalization in patients undergoing total hip arthroplasty (THA).

Methods: From September 2006 to September 2008, 52 patients underwent unilateral THA, including 36 males and 16 females, with an average age of 61.5 years (range, 46-76 years). Among these cases, there were 22 cases of avascular necrosis of the femoral head, 12 cases of hip osteoarthritis, 11 cases of femoral neck fracture, 4 cases of congenital dislocation of hip, and 3 cases of acetabular dysplasia. Forty cases had leg length discrepancy, and the shortened length of the legs was in the range of 10 mm to 35 mm with an average of 20 mm. The mean Harris score before operation was 45 points (range, 36-58 points). Based on the clinical measurement and radiographic examination, the surgical protocols were designed, the type of the hip prosthesis was chosen, and the neck length of the femoral prosthesis, and the position of osteotomy were estimated. By the proper wearing of the acetabula, the best rotation point was found out. The cut plane of the femoral neck was adjusted according to the results of the radiographic and other examinations. The neck length was readjusted after the insertion of the prosthesis so as to achieve intended leg-length equalization. The discrepancy of the leg length was measured and evaluated after operation.

Results: The incision healed by first intention in all patients. One patient had ischiadic nerve palsy and achieved full restoration after 5 months of symptomatic management. Forty-four patients were followed up 16 months on average (7-32 months). The mean Harris score was 87.5 points (80-91 points), showing significant difference (P < 0.05) when compared with that before operation. The limb length equalization were got in 35 patients (equalization rate was 79.5%). Seven patients had the prolong leg (from 10 mm to 18 mm), 2 patients had the shortened legs (15 mm and 25 mm, respectively).

Conclusion: By measurement of leg-length and radiographic examination before and during operation, the problem of unequal leg-length can be solved during the THA.