Correlation of reconstruction of the femoral offset with leg length discrepancy after total hip arthroplasty

Abstract

Objective By measuring the femoral offset (FO) before and after total hip arthroplasty (THA),the relationship between reconstruction of femoral offset and the leg length discrepancy after surgery was analyzed.Methods Seventy-nine patients who had accepted unilateral primary total hip arthroplasty were chose as the study object,including 40 males and 39 females,aged 20 ～ 80 years,averaged 51.78 years.The pelvis X-ray was taken to measure the leg length and femoral offset before and after surgery,the relationship between the reconstruction of the femoral offset and leg length discrepancy was studied.Results The difference of the femoral offset between the two sides was negatively correlated with the leg length discrepancy after operation (r =0.434,P =0.03).There was significant difference in the rate of equal leg length between the reconstruction of femoral offset group and the un-reconstruction of femoral offset group(x2 =4.13,P ＜0.05).In the reconstruction of femoral offset group,there was significant difference in the postoperative rate of leg length equality between the small bilateral FO difference group and big bilateral FO difference group (P ＜ 0.05).Conclusions In order to avoid double leg length discrepancy,femoral offset should be rebuilt during THA surgery,and in the scope of the reconstruction of femoral offset,equal bilateral femoral offset should try to be reconstructed. Key words: Total hip arthroplasty; Reconstruction of femoral offset; Leg length discrepancy