Table 2.
Etiologies and bearing types implanted at the time of primary insertion
| Parameter | Nonrevised | Revision before age 30 years | p Value |
|---|---|---|---|
| Etiology | |||
| Pediatric diseases | 18% (147) | 25% (19) | p = 0.008 |
| Septic sequelae | 8% (65) | 16% (12) | p = 0.003 |
| Inflammatory diseases | 21% (172) | 13% (10) | p = 0.004 |
| Traumatic sequelae | 14% (115) | 17% (13) | 0.1 |
| Neurologic diseases | 7% (58) | 1% (1) | 0.1 |
| Avascular necrosis | 26% (213) | 20% (15) | 0.09 |
| Primary osteorthritis | 6% (49) | 8% (6) | 0.1 |
| Type of bearing implanted | Type of bearing revised | ||
| Hard-on-soft bearings | 66% (540) | 91% (70) | p < 0.001 |
| Metal head | 41% (336) | 56% (43) | |
| Ceramic head | 25% (204) | 35% (27) | |
| Hard-on-hard bearings | 34% (279) | 9% (7) | p < 0.001 |
| Ceramic-on-ceramic | 20% (165) | 6.5% (5) | p < 0.001 |
| Metal-on-metal | 14% (114) | 2.5% (2) | p < 0.001 |