Accuracy of three-dimensional CT scan parameters for guiding total hip arthroplasty

Abstract

Objective To investigate the clinical significance of preoperative three-dimensional CT scan parameters to restore postoperative limb length and reduce postoperative dislocation in patients with total hip arthroplasty (THA). Methods Clinical data of two groups involving 86 cases that had primary unilateral THA were included. In study group 45 cases were operated on with the measurement of contralateral acetabular anteversion, acetabular abduction angle, distance from femoral neck osteotomy to the center of rotation of the femoral head and distance from femoral trochanter tip to the center of rotation based on three-dimensional CT scan. Another 41 cases under conventional surgery which not used these parameters served as control. Surgical efficacy was compared to verify the role of CT scan parameters in restoring postoperative limb length and reducing postoperative dislocation. Results Period of follow-up was (11.2±6.2)months in study group and (11.6±6.2)months in control group. Harris hip score in study group was (87.2±5.4) points versus (80.9±7.9) points in control group three months after operation (P<0.05). Limb length discrepancy in study group was (0.4±0.2)cm versus (1.1±0.4)cm in control group (P<0.05). Each group had one dislocation three months after operation. Conclusion The parameter measurement with three-dimensional CT scan has some guiding significance in THA. Key words: Arthroplasty, replacement, hip; Imaging, three-dimensional; Preoperative planning