Feasibility study of early prediction of postoperative MRI findings for knee stability after anterior cruciate ligament reconstruction

Table 2 Statistical analysis of magnetic resonance imaging findings in stable group and unstable group after operation (within one week)

MRI findings	Stable group (n = 57)	Unstable group (n = 13)	Statistic quantity	P value
Abnormal position of tibial tunnel entrance, n (%)	4(7.02%)	6(46.15%)	χ² = 2.169	0.002
Inner opening of the tibial tunnel (%), mean ± SD	30.438 ± 6.620	26.308 ± 6.143	t = -2.056	0.044
Position of tibial tunnel exit (mm), mean ± SD	20.091 ± 5.033	13.7638 ± 6.009	t = -3.954	0.001
Abnormal position of femoral tunnel entrance, n (%)	27(47.37%)	10(76.92%)	χ² = 3.711	0.054
Height ratio of the position of femoral tunnel, mean ± SD	0.747 ± 0.122	0.698 ± 0.115	t = -1.328	0.189
Width ratio of the position of femoral tunnel, mean ± SD	0.265 ± 0.065	0.314 ± 0.128	t = 1.339	0.203
Lateral tibial posterior slope (LTPS) (°) mean ± SD	6.667 ± 3.061	10.077 ± 3.201	t = 3.595	0.001
Medial tibial posterior slope (MTPS) (°), mean ± SD	7.526 ± 2.707	9.231 ± 3.244	t = 1.974	0.052
Depth of the medial tibial plateau (mm), mean ± SD	2.421 ± 0.691	2.716 ± 0.947	t = 1.291	0.201
Width of intercondylar notch (mm), mean ± SD	14.937 ± 2.589	13.353 ± 2.392	t = -2.016	0.048
Intercondylar Notch width index (NWI)	0.214 ± 0.032	0.197 ± 0.032	t = -1.725	0.089
Cross-sectional area of the intercondylar notch (mm²), mean ± SD	307.070 ± 63.924	274.462 ± 47.330	t = -1.730	0.088
Coronal obliquity of the graft (°), mean ± SD	61.421 ± 6.375	59.769 ± 7.876	t = -0.806	0.423
Sagittal obliquity of the graft (°), mean ± SD	52.439 ± 7.246	48.231 ± 10.655	t = -1.721	0.090

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