Table 1.
Patient characteristics prior to the index operation
| Matched a | |||||
|---|---|---|---|---|---|
| Control | p-value | Group 1 | p-value | Group 2 | |
| Total hip arthroplasties (patients) | 22 (22) | 22 (21) | 50 (48) | ||
| Age, median | 67 | 0.4 b | 69 | 0.2 b | 70 |
| range | 53–84 | 48–88 | 40–88 | ||
| Male | 15 | 0.2 c | 10 | 0.1 c | 29 |
| Charnley classification | 0.9 d | 0.15 d | |||
| A | 12 | 14 | 31 | ||
| B1 | 1 | 1 | 0 | ||
| B2 | 9 | 7 | 17 | ||
| C | 0 | 0 | 2 | ||
| Previous surgery performed | 2 | 1.0 c | 3 | < 0.001 c | 39 |
| on trochanter | 2 | 1.0 d | 2 | 0.4 d | 17 |
| on cup, for any reason | 1 | 0.3 d | 0 | 0.002 d | 23 |
| on stem, for any reason | 2 | 1 d | 2 | 0.01 d | 25 |
| debridement(s) | 0 | 1 d | 0 | < 0.001 d | 70 e |
| Girdlestone/spacer | – | – | 4/2 | ||
| Proprosky classification cup | 0.5 d | f | 0.004 d | f | |
| 1 | 13 | 15 | 17 | ||
| 2A | 3 | 1 | 5 | ||
| 2B | 2 | 2 | 5 | ||
| 2C | 2 | 2 | 12 | ||
| 3A | 2 | 1 | 6 | ||
| 3B | 0 | 0 | 4 | ||
| Proprosky classification stem | 0.6 d | f | 0.2 d | f | |
| I | 0 | 1 | 1 | ||
| II | 17 | 16 | 19 | ||
| IIIA | 4 | 3 | 20 | ||
| IIIB | 1 | 1 | 2 | ||
| IV | 0 | 0 | 7 | ||
| Deficient greater trochanter | 1 | 1 c | 1 | 0.05 c | 12 |
a Control and group 1 were matched for all listed variables.
b Student t-test
c Chi-square test.
d Mann-Whitney U-test.
e 16 hips received ≥ 2 (range 2–10) debridements.
f One preoperative radiograph was not available.