Comparison of Short Curved Stems and Standard-length Single Wedged Stems for Cementless Total Hip Arthroplasty

Purpose: Purpose: The purpose of this study was to compare the clinical and radiographic outcomes with use of short-curved stems versus standard-length single wedged stems over a minimum follow-up period of five years.Materials and Methods: Materials and Methods: A retrospective study of primary total hip arthroplasties performed using the Fitmore ® stem (127 hips, 122 patients) and the M/L taper ® stem (195 hips, 187 patients) between October 2012 and June 2014 was conducted.The clinical and radiographic outcomes were obtained for evaluation over a minimum follow-up period of five years.Results: Results: In both the Fitmore ® and M/L taper ® groups, the mean Harris hip score improved from 52.4 and 48.9 preoperatively to 93.3 and 94.5 at the final follow-up, respectively (P=0.980).The mean Western Ontario and McMaster Universities Osteoarthritis Index scores also improved from 73.3 and 76.8 preoperatively to 22.9 and 25.6 at the final follow-up, respectively (P=0.465).Fifteen hips (Fitmore ® : 14 hips; M/L taper ® : one hip, P<0.001) developed intraoperative cracks and were treated simultaneously with cerclage wiring.Radiography showed a radiolucent line in 24 hips in the Fitmore ® group and 12 hips in the M/L taper ® group (P=0.125).Cortical hypertrophy was detected in 29 hips (Fitmore ® group: 28 hips; M/L taper ® group: one hip, P<0.001).Conclusion: Conclusion: Similarly favorable clinical and radiographic outcomes were achieved with use of both short-curved stems and standard-length single wedged stems.However, higher cortical hypertrophy and a higher rate of femoral crack were observed with use of Fitmore ® stems.