Table 3.
Demographic comparison between failures and nonfailures
| Demographic | Overall | Failures | Nonfailures | p value |
|---|---|---|---|---|
| Number of hips | 534 | 34 | 500 | |
| Average age (years) | 64 | 61 | 64 | 0.288 |
| Average height (inches) | 66 | 66 | 66 | 0.569 |
| Average weight (pounds) | 188 | 187 | 188 | 0.885 |
| Average body mass index (kg/m2) | 30 | 30 | 30 | 0.831 |
| Average pack-years | 12 | 22 | 12 | 0.009 |
| Smoking status | 0.008 | |||
| Unknown | 7 (1%) | 0 (0%) | 7 (1%) | |
| Nonsmoker | 271 (51%) | 8 (24%) | 263 (53%) | |
| Prior smoker | 167 (31%) | 17 (50%) | 150 (30%) | |
| Current smoker | 89 (17%) | 9 (27%) | 80 (16%) | |
| Sex | 0.587 | |||
| Males | 228 (43%) | 13 (38%) | 215 (43%) | |
| Females | 306 (57%) | 21 (62%) | 285 (57%) | |
| Procedure | 0.006 | |||
| Primary | 142 (27%) | 2 (6%) | 140 (28%) | |
| Conversion | 17 (3%) | 0 (0%) | 17 (3%) | |
| Revision | 310 (58%) | 23 (68%) | 287 (57%) | |
| Reimplantation | 63 (12%) | 9 (26%) | 54 (11%) | |
| Total femur | 2 (< 1%) | 0 (0%) | 2 (< 1%) | |
| Paprosky class | 0.148 | |||
| I | 93 (17%) | 4 (12%) | 89 (18%) | |
| IIA | 155 (29%) | 12 (35%) | 143 (29%) | |
| IIB | 114 (21%) | 8 (24%) | 106 (21%) | |
| IIC | 83 (16%) | 1 (3%) | 82 (16%) | |
| IIIA | 83 (16%) | 9 (27%) | 74 (15%) | |
| IIIB | 6 (1.1%) | 0 (0%) | 6 (1%) | |
| Augments used | 28 (5%) | 4 (12%) | 24 (5%) | 0.439 |
| Constraint used | 95 (18%) | 9 (27%) | 86 (17%) | 0.171 |
| History of infection | 107 (20%) | 11 (32%) | 96 (19%) | 0.070 |
| History of diabetes | 73 (14%) | 8 (24%) | 65 (13%) | 0.090 |
| History of cardiac disease | 153 (29%) | 9 (26%) | 144 (29%) | 0.739 |
| History of cancer | 27 (5%) | 2 (6%) | 25 (5%) | 0.831 |
| Prior metal-on-metal | 85 (16%) | 8 (24%) | 77 (15%) | 0.171 |
| Preoperative HHS | 49 | 48 | 49 | 0.778 |
| Postoperative HHS | 72 | 59 | 73 | 0.000 |
| HHS improvement | 24 | 9 | 25 | 0.000 |
HHS = Harris hip score (0–100 possible with 100 being best).