| Objective To study the usability and safety of the acetabular center positioning tool in arthroplasty for Crowe type Ⅳ developmental dysplasia of the hip.Methods The 37 DDH patients (44 hips) who underwent total hip arthroplasty in Yili Xinhua Hospital from January 2020 to January 2022 were retrospectively analyzed and divided into two groups, 20 patients (24 hips) in group A which referred to the positioning tool, 17 patients (20 hips) in group B which referred to the transverse acetabular ligament. The operation time, incision size, intraoperative blood loss, landing time, Harris hip score, bilateral limb length difference, postoperative cup abduction angle, anteversion angle, and the difference between the horizontal and vertical distances between the postoperative center of rotation of the prosthesis and the center of anatomical rotation were compared.Results There was no dislocation, infection, deep vein thrombosis, or prosthesis loosening in any of the patients after operation. There was no significant difference in the operation time, intraoperative blood loss, incision length, time to ground, Harris hip score and length of bilateral limbs between the two groups (P>0.05). There was no statistical difference in the abduction angle and anteversion angle of the acetabular cup between the two groups (P>0.05). The vertical distance from the center of rotation were (21.54±2.32) mm in group A, (22.40±2.23) mm in group B, and the horizontal distance were respectively (29.42±2.45) mm in group A and (29.85±2.92) mm in group B. The difference between the reconstructed center of rotation and the anatomical center of rotation were compared between the groups, and the differences were not statistically significant (P>0.05).Conclusion The acetabular center positioning tool can provide a reference mark for the operator in total hip arthroplasty for Crowe type Ⅳ developmental dysplasia of the hip. The clinical results are comparable to those of transverse acetabular ligament. |
