Abstract Objective To retrospective analysis of the mid-term effect of total hip arthroplasty in adult DDH patients after failed hip preservation surgery.Methods 22 patients(30 hips) with developmental dysplasia of the hip who underwent total hip arthroplasty after failed hip preservation surgery from January 2014 to January 2019 were selected as the study subjects.Harris hip score system and visual analog score(VAS) were used to evaluate before and after surgery,and X-ray films were analyzed before and after surgery.Results The average follow-up time for total hip arthroplasty in this study was (30.5±18.5) months.After total hip arthroplasty,the Harris overall score was improved from (38.7±10.6) preoperatively to (89.4±9.7) at the last follow-up and the difference was statistically significant (t=19.67,P<0.001).The postoperative scores of pain,walking,function,and activity were higher than those before surgery and the difference was statistically significant;The pain VAS score had decreased from the average (7.9±0.9) points before surgery to (1.4±1.0) at the last follow-up and the difference was statistically significant (t=30.67,P<0.01).The difference in the length of the lower limbs of the patients decreased from the average (3.32±0.51) cm before surgery to (0.71±0.33) cm after surgery,and the difference was statistically significant (t=14.01,P<0.001).All patients had no postoperative complications such as surgical incisions and periprosthetic infections,loosening of the prosthesis,hip dislocation,vascular and nerve damage,deep vein thrombosis and ectopic ossification;only 2 patients had longitudinal femoral proximal split line in surgery.Conclusion Total hip arthroplasty in adult patients with developmental dysplasia of the hip after hip preservation surgey can achieve satisfactory mid-term results.
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