| Bi-Metric | Echo FPP | Echo RPP | ||
| Hips | Total Count | 1497 | 1277 | 366 |
| Female/Male | 633/864 | 560/717 | 325/41 | |
| Age [range] (yrs.) | 62.4 [23, 93] | 64.8 [26, 93] | 63.2 [21, 95] | |
| Time of surgery | 1986-2008 | 2007-2014 | 2007-2014 | |
| F/u Period (yrs.) | 7.9 [0, 26.0] | 1.6 [0, 6.5] | 1.3 [0, 5.0] | |
| BMI (kg/m2) | 30.0 [16.7, 58.1] | 31.2 [18.6, 60.3] | 31.1 [16.1, 54.1] | |
| Approach | Anterolateral | 549 (36.7%) | 433 (33.9%) | 261 (71.3%) |
| Posterior | 799 (53.4%) | 835 (65.4%) | 104 (28.4%) | |
| Diagnosis | OA | 1329 (88.8%) | 1213 (95.0%) | 344 (94.0%) |
| RA | 19 (1.3%) | 8 (0.6%) | 9 (2.5%) | |
| AVN | 130 (8.7%) | 35 (2.7%) | 10 (2.7%) | |
| Others | 19 (1.3%) | 21 (1.6%) | 3 (0.8%) | |