Benchmarking total hip replacement constructs using noninferiority analysis: the New Zealand joint registry study

Abstract Background The aim of this study was to compare the relative performance total hip replacement constructs and discern if there is substantial variability in currently commonly used prostheses New Zealand Joint Registry (NZJR) using a noninferiority analysis. Methods All patients who underwent primary (THR) registered NZJR between 1st January 1999 June 2020 were identified. Using analysis, compared with best performing contemporary construct. Construct failure estimated 1-Kaplan Meier survival function method estimate net failure. difference benchmark other examined. Results In 135,432 THR recorded comprising 1035 different constructs. Notably 328 just once. Forty-eight (62,251 THR) had > 500 procedures at risk 3 years post-primary which 28 inferior by least 20% which, 10 100% risk. Sixteen identified 9 20%, one There fewer noninferior practice when we performed analysis gender. females years, from 5 risk, 2 margin. males only eligible Conclusions We discerned that construct most time points, over half are 20%. These results can facilitate informed decision-making considering surgery.