TABLE 3.
Subsequent Fracture Rates, by Type of Index Fracturea
| Subsequent Fractureb | ||||||
|---|---|---|---|---|---|---|
| Overall | Vertebral | Hip | NHNV | Multiple | ||
| Index fracture | Medicare, n (%) | |||||
| Overall (N = 45,603) | 7,604 (16.7) | 1,746 (3.8) | 1,256 (2.8) | 3,260 (7.2) | 1,342 (2.9) | |
| Vertebral (n = 9,465) | 1,908 (20.2) | 1,235 (13.1) | 101 (1.1) | 315 (3.3) | 257 (2.7) | |
| Hip (n = 5,024) | 1,280 (25.5) | 84 (1.7) | 719 (14.3) | 257 (5.1) | 220 (4.4) | |
| NHNV (n = 27,657) | 3,511 (12.7) | 354 (1.3) | 228 (0.8) | 2,351 (8.5) | 578 (2.1) | |
| Multiple (n = 3,457) | 905 (26.2) | 73 (2.1) | 208 (6.0) | 337 (9.8) | 287 (8.3) | |
| Commercial, n (%) | ||||||
| Overall (N = 54,145) | 6,256 (11.6) | 838 (1.6) | 502 (0.9) | 4,080 (7.5) | 836 (1.5) | |
| Vertebral (n = 5,799) | 841 (14.5) | 576 (9.9) | 29 (0.5) | 136 (2.4) | 100 (1.7) | |
| Hip (n = 2,385) | 525 (22.0) | 18 (0.8) | 292 (12.2) | 114 (4.8) | 101 (4.2) | |
| NHNV (n = 42,666) | 4,082 (9.6) | 192 (0.5) | 96 (0.2) | 3,405 (8.0) | 389 (0.9) | |
| Multiple (n = 3,295) | 808 (24.5) | 52 (1.6) | 85 (2.6) | 425 (12.9) | 246 (7.5) | |
aBold font highlights the propensity of the subsequent fracture to be the same type as the index fracture.
bAccording to chi-square analysis, the probability that there is not a relationship between the type of index fracture and the type of subsequent fracture is < 0.001 (for vertebral, hip, and NHNV fractures types only).
NHNV = nonhip nonvertebral.