Conclusions Current published evidence does not support survivorship differences among commonly used bearing surfaces in patients younger than age 65 years undergoing THA at short- to mid-term followup .
Background  Total hip arthroplasty ( THA )  is increasingly being performed in patients with long life expectancies and active lifestyles .
Newer implant bearing surfaces , with superior wear characteristics , often are used in this cohort with the goal of improving longevity of the prosthesis , but comparisons across the numerous available bearing surfaces are limited , so the surgeon and patient may have difficulty deciding which implants to use .
Questions / purpose sThe purpose of this study was to answer the following question : Is there a short- to mid-term survivorship difference between common THA bearings used in patients younger than age 65 years ?
Crosslinked polyethylene compared to conventional polyethylene in total hip replacement: Pre-clinical evaluation, in-vitro testing and prospective clinical follow-up study
Background Polyethylene wear-induced osteolysis is a major cause of implant loosening in total hip arthroplasty . New crosslinked polyethylenes are presumed to give lower wear rates , but no long-term clinical results are available yet . Patients and methods We compared basic material characteristics and MTS hip joint simulator wear rates of a crosslinked polyethylene ( Duration ) to those of conventional polyethylene . In a r and omized double-blind 5-year clinical follow-up study , 133 hips ( 67 conventional , 66 Duration ) in 127 patients were followed-up for an average of 5 ( 3–6 ) years .  Wear rates were measured using a computer-based edge detection method . The radiographic appearances of wear-related phenomena were recorded . Results The Duration polyethylene showed a significantly lower in-vitro wear rate in the simulator study ( mean 22 ( SD 2.3 ) vs. 40 ( SD 1.5 ) mm3/106 cycles ) . Also , the in-vivo wear was lower for Duration ( mean 0.083 ( SD 0.056 ) mm/year ) than for conventional polyethylene ( mean 0.123 ( SD 0.082 ) mm/year ) . All radiographic signs of osteolysis were less frequent in the Duration group . Interpretation Our study has given a substantial body of evidence —from lower wear rates , less frequent signs of osteolysis , and higher survival rates after a mean follow-up of 5 years — that Duration provides better clinical outcomes than conventional polyethylene
Conclusions Current published evidence does not support survivorship differences among commonly used bearing surfaces in patients younger than age 65 years undergoing THA at short- to mid-term followup .
Background  Total hip arthroplasty ( THA )  is increasingly being performed in patients with long life expectancies and active lifestyles .
Newer implant bearing surfaces , with superior wear characteristics , often are used in this cohort with the goal of improving longevity of the prosthesis , but comparisons across the numerous available bearing surfaces are limited , so the surgeon and patient may have difficulty deciding which implants to use .
Questions / purpose sThe purpose of this study was to answer the following question : Is there a short- to mid-term survivorship difference between common THA bearings used in patients younger than age 65 years ?