Table 4.
Factors associated with OA progression with use of the log-rank test
| Variables | Pre-OA | Early stage | ||
|---|---|---|---|---|
| Age at the time of surgery | ||||
| Older 46 years | 1 hip (1) | 25 hips (10) | ||
| Younger than 46 years | 26 | (1) p < 0.001 | 93 | (14) p < 0.05 |
| Charnley classification | ||||
| A | 2 | (0) | 22 | (5) |
| B | 25 | (2) unable to assess | 96 | (19) p = 0.65 |
| Postoperative center-edge angle | ||||
| Over 31° | 9 | (1) | 60 | (19) |
| Less than 31° | 18 | (1) p = 0.544 | 58 | (5) p = 0.022 |
| Postoperative acetabular roof angle | ||||
| Over 3° | 10 | (1) | 49 | (10) |
| Less than 3° | 17 | (1) p = 0.921 | 69 | (14) p = 0.71 |
| Postoperative head lateralization index | ||||
| Over 0.61 | 8 | (0) | 73 | (14) |
| Less than 0.61 | 19 | (2) unable to assess | 45 | (10) p = 0.78 |
| Postoperative joint congruency | ||||
| Excellent or good | 27 | (2) | 113 | (20) |
| Fair | 0 | unable to assess | 5 | (4) p < 0.001 |
Numbers in parentheses were progression of OA; OA = osteoarthritis.