Table 1.
Characteristics of Study Participants a
| Anterior Knee Laxity | Rotatory Knee Laxity | |||
|---|---|---|---|---|
| Without (n = 166) | With (n = 26) | Without (n = 172) | With (n = 20) | |
| Age, y | 24.4 ± 11.4 | 23.3 ± 10.9 | 24.6 ± 11.6 | 21.5 ± 8.9 |
| Sex, male/female, n | 55/111 | 9/17 | 58/114 | 6/14 |
| Body mass index, kg/m2 | 23.0 ± 3.5 | 23.0 ± 4.0 | 23.1 ± 3.5 | 22.6 ± 3.8 |
| Tegner score | 6.4 ± 1.6 | 6.5 ± 2.1 | 6.4 ± 1.7 | 6.5 ± 1.9 |
| Time from injury to surgery, mo | 5.5 ± 23.1 | 3.5 ± 4.7 | 5.5 ± 22.7 | 2.9 ± 2.9 |
| KT-1000 arthrometer side-to-side difference, mm | 0.5 ± 0.5 | 2.2 ± 0.4 b | 0.6 ± 0.6 | 1.8 ± 0.9 b |
| Signal intensity ratio | ||||
| AMB on PDW | ||||
| 3 mo | 0.99 ± 0.25 | 1.25 ± 0.45 b | 1.00 ± 0.27 | 1.24 ± 0.42 b |
| 6 mo | 1.22 ± 0.32 | 1.54 ± 0.50 b | 1.23 ± 0.33 | 1.53 ± 0.54 b |
| 12 mo | 1.21 ± 0.40 | 1.36 ± 0.32 b | 1.22 ± 0.40 | 1.31 ± 0.35 |
| AMB on T2W | ||||
| 3 mo | 1.05 ± 0.18 | 1.22 ± 0.28 b | 1.06 ± 0.19 | 1.19 ± 0.30 |
| 6 mo | 1.14 ± 0.22 | 1.33 ± 0.25 b | 1.15 ± 0.23 | 1.32 ± 0.25 b |
| 12 mo | 1.08 ± 0.24 | 1.14 ± 0.22 | 1.08 ± 0.24 | 1.11 ± 0.22 |
| PLB on PDW | ||||
| 3 mo | 1.07 ± 0.27 | 1.38 ± 0.52 b | 1.08 ± 0.30 | 1.38 ± 0.47 b |
| 6 mo | 1.31 ± 0.32 | 1.70 ± 0.48 b | 1.33 ± 0.33 | 1.65 ± 0.53 b |
| 12 mo | 1.31 ± 0.40 | 1.56 ± 0.38 b | 1.32 ± 0.40 | 1.50 ± 0.43 |
| PLB on T2W | ||||
| 3 mo | 1.10 ± 0.23 | 1.32 ± 0.36 b | 1.11 ± 0.25 | 1.27 ± 0.33 b |
| 6 mo | 1.22 ± 0.27 | 1.53 ± 0.44 b | 1.23 ± 0.29 | 1.46 ± 0.46 b |
| 12 mo | 1.15 ± 0.29 | 1.31 ± 0.33 b | 1.16 ± 0.30 | 1.26 ± 0.36 |
a Data are reported as mean ± SD unless otherwise indicated. AMB, anteromedial bundle; PDW, proton density weighted; PLB, posterolateral bundle; T2W, T2 weighted.
b Statistically significant difference between patients with and without laxity (P < .05; Mann-Whitney U test).