Table 3.
Results of Receiver Operating Characteristic Curve Analysis of Signal Intensity Ratio and Residual Knee Laxity at 1 Year Postoperatively a
| Anterior Knee Laxity | Rotatory Knee Laxity | |||
|---|---|---|---|---|
| Age <30 y (n = 19) | Age ≥30 y (n = 7) | Age <30 y (n = 15) | Age ≥30 y (n = 5) | |
| AMB on PDW | ||||
| 3 mo | 0.811 (0.691-0.932) b |
0.411 (0.177-0.645) |
0.718 (0.542-0.893) b |
0.638 (0.403-0.874) |
| 6 mo | 0.785 (0.680-0.891) b |
0.420 (0.194-0.646) |
0.688 (0.527-0.850) b |
0.558 (0.317-0.799) |
| 12 mo | 0.676 (0.561-0.791) b |
0.529 (0.327-0.730) |
0.611 (0.465-0.756) |
0.558 (0.315-0.800) |
| AMB on T2W | ||||
| 3 mo | 0.791 (0.679-0.904) b |
0.497 (0.296-0.699) |
0.695 (0.522-0.868) b |
0.477 (0.232-0.722) |
| 6 mo | 0.779 (0.671-0.888) b |
0.597 (0.397-0.798) |
0.763 (0.633-0.893) b |
0.592 (0.353-0.832) |
| 12 mo | 0.613 (0.479-0.748) | 0.563 (0.324-0.801) |
0.581 (0.415-0.746) |
0.535 (0.323-0.746) |
| PLB on PDW | ||||
| 3 mo | 0.833 (0.711-0.955) b |
0.374 (0.144-0.605) |
0.718 (0.548-0.889) b |
0.723 (0.523-0.923) |
| 6 mo | 0.848 (0.758-0.939) b |
0.509 (0.276-0.741) |
0.734 (0.587-0.881) b |
0.485 (0.220-0.750) |
| 12 mo | 0.747 (0.642-0.853) b |
0.526 (0.287-0.764) |
0.654 (0.498-0.810) |
0.588 (0.371-0.806) |
| PLB on T2W | ||||
| 3 mo | 0.804 (0.688-0.919) b |
0.460 (0.244-0.676) |
0.672 (0.495-0.849) b |
0.554 (0.288-0.820) |
| 6 mo | 0.847 (0.771-0.922) b |
0.534 (0.292-0.777) |
0.711 (0.577-0.845) b |
0.681 (0.506-0.856) |
| 12 mo | 0.686 (0.557-0.814) b |
0.577 (0.343-0.812) |
0.619 (0.448-0.791) |
0.581 (0.422-0.739) |
a Data are reported as area under the curve (95% CI). AMB, anteromedial bundle; PDW, proton density weighted; PLB, posterolateral bundle; T2W, T2 weighted.
b Statistically significant for discriminating between patients with and without residual knee laxity at 12 months postoperatively (P < .05).