Table 7.
Summary of baseline characteristics and follow-up information by procedure type in men aged under 55. Figures are numbers (percentage) unless stated otherwise
| Birmingham hip resurfacing (n=3560) | Uncemented (n=6193) | Cemented (n=1730) | |
|---|---|---|---|
| Baseline characteristics | |||
| Age (years): | |||
| Mean (SD) | 47.9 (5.5) | 48.5 (6.1) | 49.1 (5.9) |
| Median | 49.2 | 50.3 | 51.0 |
| Interquartile range | 44.7-52.3 | 45.8-53.0 | 46.7-53.4 |
| Range | 19.0-55.0 | 17.1-55.0 | 18.10-55.0 |
| ASA (American Society of Anesthesiologists) grade: | |||
| 1 | 2077 (58.3) | 2595 (41.9) | 692 (40.0) |
| 2 | 1421 (39.9) | 3225 (52.1) | 925 (53.5) |
| 3 | 59 (1.7) | 360 (5.8) | 108 (6.2) |
| 4 | 2 (0.1) | 12 (0.2) | 4 (0.2) |
| 5 | 1 (0.03) | 1 (0.02) | 1 (0.1) |
| Procedure type: | |||
| Primary | 3511 (98.6) | 6119 (98.8) | 1525 (88.2) |
| Complex primary | 49 (1.4) | 74 (1.2) | 205 (11.9) |
| Both sides: | |||
| No | 3531 (99.2) | 6143 (99.2) | 1716 (99.2) |
| Yes | 29 (0.8) | 50 (0.8) | 14 (0.2) |
| Follow-up | |||
| Endpoint: | |||
| Death | 10 (0.3) | 56 (0.9) | 32 (1.9) |
| Revision | 60 (1.7) | 107 (1.7) | 28 (1.6) |
| Unrevised | 3490 (98.0) | 6030 (97.4) | 1670 (96.5) |
| Total length of follow-up, person years | 11 637 | 15 886 | 5991 |