CHEN Chengwang,PAN Xiaoyun,XUE Enxing, et al. Clinical research of measurement of anatomical proximal femor using X ray in equalizing limb length in total hip arthroplasty[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2014, 44(9): 678-.
Abstract：Objective: To explore the clinical meaning of measurement of anatomical proximal femor in equalizing limb length in total hip arthroplasty. Methods: From Feburary 2011 to December 2012, 120 patients including 65 males and 55 females underwent unilateral THA. The clinical measurement and radiographic examination were accomplished. The discrepancy of limb length was measured using PACS system in computer, and at the meantime, from the other hip, the angle of the anatomical axis of femur and the line linked the center of femoral head and the top of great trochant was measured. Based on these results, the surgical protocols were designed, the type of hip prosthesis was chosen, and the neck length of femoral prothesis, and the position of osteotomy were estimated. By the proper wearing of the acetabula, the best rotation point was found out. According to the results of radiographic and other examination, 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. The leg length equalization was got in 108 patients (<0.5 cm, 68 cases; 0.5~1.0 cm, 40 cases), and only 12 limbs had been lengthened more than 1.0 cm. One hundred and two patients were followed up for 15.1 months on average (5~27 months). Setting the results against those before surgery (46.2±7.2), the mean Harris score was 86.5±6.9 points after surgery. Conclusion: With the measurement of the anatomical proximal femor using X ray accompanying other methods before and during operation, the problem of unequal leg length can be well solved in total hip arthroplasty.
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