HRA THA P value N 19 15 - Age (years) 49.9 ± 9.6 58.3 ± 7.3 0.009 Height (cm) 175 ± 6 176 ± 6 0.83 BMI (kg/m2) 27.2 ± 3.9 28.6 ± 2.8 0.28 Weight (kg) at pre-op 83.6 ± 11.3 88.3 ± 10.0 0.21 Weight (kg) at 12 months 84.5 ± 12.1 88.7 ± 10.2 0.30

Table 1: patient characteristics; Values expressed as mean ± SD; Age, height and BMI refer to the preoperative state; HRA-hip resurfacing arthroplasty; THA-total hip arthroplasty.