Table 2.
Crude Subsequent (Revision or Contralateral) ACLRs, Incidence Rate of Subsequent ACLR, and Subsequent ACLR Riska
| Age Group | |||||
|---|---|---|---|---|---|
| Overall Cohort | <21 y | 21-30 y | 31-40 y | >40 y | |
| Subsequent (revision or contralateral) ACLR, n (%)a | 2957 (3.14) | 1006 (4.71) | 685 (3.00) | 622 (2.58) | 644 (2.49) |
| Incidence rate of subsequent (revision or contralateral) ACLR per 100 person-years (95% CI) | 1.60 (1.54-1.65) | 2.41 (2.26-2.56) | 1.53 (1.41-1.64) | 1.31 (1.21-1.41) | 1.26 (1.17-1.36) |
| Crude HR (95% CI)b | 1.91 (1.73-2.10) | 1.21 (1.08-1.34) | 1.03 (0.93-1.16) | Reference | |
| P value | <.001 | .001 | .54 | Reference | |
| Adjusted HR (95% CI)b,c | 2.10 (1.89-2.34) | 1.29 (1.15-1.44) | 1.07 (0.95-1.20) | Reference | |
| P value | <.001 | <.001 | .25 | Reference | |
aValues are reported as number, incidence rate, or hazard ratio. ACLR, anterior cruciate ligament reconstruction; HR, hazard ratio.
bAge group >40 used as reference, as this group had the lowest incidence rate of subsequent ACLR.
cModels adjusted for age, sex, race/ethnicity, and insurance type.