Title : Two-year clinical results for total hip arthroplasty with a cementless, tapered hip system: A prospective multicenter study
Abstract:
Introduction: Cementless tapered femoral stems for total hip arthroplasty (THA) demonstrate potential for improving implant stability and longevity; however, optimal implant fixation remains controversial. Therefore, the present study compared preoperative patient assessments and two-year postoperative clinical outcomes to evaluate the short-term efficacy of a modern cementless tapered stem.
Methods: One hundred eighty-nine patients across five sites participated in this prospective, multicenter study. Each participant completed preoperative assessments, including the Harris Hip Score (HHS), Oxford Hip Score (OHS), Hip Disability and Osteoarthritis Outcome Score (HOOS), Euro-Qol 5-dimension (EQ-5D-5L) Score, and Veterans RAND-12 (VR-12) surveys, before undergoing THA with the MasterLoc Hip System (Medacta International SA, Castel San Pietro, Switzerland). Participants repeated these clinical assessments at each follow-up visit at six weeks, six months, one year, and two years. Mean preoperative and postoperative scores were compared using a paired t-test.
Results: All clinical outcomes improved between the preoperative evaluation and the two-year postoperative follow-up. The EQ-5D-5L score increased from 0.60 to 0.89 (p ≤ 0.0001), the HHS improved from 54 to 90 (p ≤ 0.0001), the HOOS total score improved from 43 to 91 (p ≤ 0.0001), the OHS increased from 21 to 44 (p ≤ 0.0001), the VR-12 mental component score increased from 47 to 52 (p ≤ 0.0001), and the VR-12 physical component score increased from 26 to 45 (p ≤ 0.0001).
Conclusions: Significant improvements in the HHS, OHS, HOOS, EQ-5D-5L, and VR-12 scores between preoperative patient assessments and two-year postoperative follow-ups suggest that this modern cementless tapereed stem provides excellent two-year outcomes. These findings support the efficacy of this device for THA; however, longer-term studies must validate these results and further assess longevity.
