Sex | Males | 3 |
 | Females | 7 |
Average age | Â | Â |
 | Males | 63.7 ± 12.5 |
 | Females | 57.6 ± 3.7 |
Years post initial total knee arthroplasty | Â | Â |
 | Males | 3.0 ± 1.9 |
 | Females | 2.9 ± 0.9 |
Average body mass index (kg/cm 2 ) | Â | Â |
 | Males | 28.4 ± 1.6 |
 | Females | 36.4 ± 1.8 |
Range of motion (0°-100° flexion) |  |  |
 | Males | 53.3 ± 10.8 |
 | Females | 44.2 ± 6.6 |
Tissue calcification (bone volume, mm 3 of hydroxyapatite) | Â | Â |
 | Males | 2.04 ± 2.34 |
 | Females | 3.93 ± 2.47 |