Table 5.
Comparative mean preoperative and postoperative range-of-motion measurements for each group*
| Range of motion measurement | Osteonecrosis group (n = 85) | Control group (n = 915) | p |
|---|---|---|---|
| Preoperative flexion | 111 | 105.1 | 0.0027 |
| Preoperative flexion contracture | 13.9 | 16.4 | 0.1066 |
| Preoperative abduction (in extension) | 23.9 | 23.1 | 0.6383 |
| Preoperative adduction (in extension) | 16.4 | 14.3 | 0.0747 |
| Preoperative rotation arc (in extension) | 29.5 | 23 | 0.004 |
| Postoperative flexion | 127.1 | 126 | 0.4976 |
| Postoperative flexion contracture | 1.3 | 1.7 | 0.4997 |
| Postoperative abduction (in extension) | 46.4 | 45.3 | 0.2752 |
| Postoperative adduction (in extension) | 28.9 | 28 | 0.2731 |
| Postoperative rotation arc (in extension) | 79.4 | 77.1 | 0.2949 |
* Modified with permission from Amstutz H, Le Duff M, Boitano P. Osteonecrosis of the hip. In: Amstutz HC, ed. Hip Resurfacing: Principles, Indications, Technique and Results. Philadelphia: Elsevier; 2008:161–180. © Elsevier 2008.