Table 1.
Characteristics of patients undergoing total ankle arthroplasty, 1998 to 2011
| White | Black | P value | |
|---|---|---|---|
| ( n = 12,122) | ( n = 488) | ||
| Age (years) | 61.9 (61.1, 62.7) | 52.0 (49.6, 54.3) | <0.0001 |
| Female | 54.8 | 61.9 | 0.19 |
| Age group | |||
| < 50 years | 15.5 | 42.2 | <0.0001 |
| 50 to 64 years | 38.3 | 43.6 | 0.28 |
| 65 to 79 years | 41.2 | 12.5 | <0.0001 |
| ≥ 80 years | 5.1 | 1.7 | 0.11 |
| Underlying diagnosis | |||
| Osteoarthritis | 62.5 | 47.2 | 0.005 |
| Rheumatoid arthritis | 5.6 | 10.3 | 0.04 |
| Fracture | 0.1 | 1.0 | 0.04 |
| Traumatic arthropathy | 18.8 | 18.6 | 0.96 |
| Avascular necrosis | 0.5 | 0.9 | 0.51 |
| Other | 12.6 | 22.0 | 0.01 |
| Deyo-Charlson score | |||
| 0 | 71.8 | 65.8 | 0.25 |
| 1 | 23.2 | 22.9 | 0.96 |
| ≥ 2 | 5.0 | 11.2 | 0.01 |
| Hospital volume (procedures/year) | |||
| < 5 | 35.2 | 47.6 | 0.04 |
| 5 to 9 | 25.6 | 26.5 | 0.89 |
| 10 to 14 | 12.3 | 5.7 | 0.14 |
| 15 to 24 | 17.7 | 14.4 | 0.42 |
| ≥ 25 | 9.3 | 5.8 | 0.21 |
Data presented as mean (95% confidence interval) or percentage.