Predictive factors for coronal and sagittal graft extrusion length after using tendon autograft for medial meniscus reconstruction

Table 5 Regressions between graft extrusions and potential factors

y	Standardized	Equation	P value				R2
			Regression	x1	x1	x1
				Preoperative relative joint space width	Anterior tunnel edge distance	Posterior tunnel edge distance
1 wk after operation
Medial extrusion	Yes	y = -14.6x1 + 68.9	0.000	0.000			0.873
	No	y = -0.0604x1 + 0.737
Anterior extrusion	Yes	y = -9.755x2 + 5.77	0.006		0.006		0.632
	No	y = -1.185x2 + 1.831
Posterior extrusion	Yes	y = -0.6192x1 - 0.3481x3 + 86.65	0.009	0.024		0.132	0.741
	No	y = -14.75x1 - 0.1744x3 + 12.07
Mean extrusion	Yes	y = -12.6x1 + 44.6	0.001	0.001			0.763
	No	y = -0.0523x1 + 0.63
8 mo after operation
Medial extrusion	Yes	y = -15.13x1 + 88.34	0.005	0.005			0.884
	No	y = -0.04563x1 + 0.7183
Anterior extrusion	Yes	y = -16.80x2 - 6.641	0.012		0.012		0.827
	No	y = -0.9522x2 + 2.994
Posterior extrusion	Yes	y = -0.3597x1 - 0.6639x3 + 99.15	0.016	0.232		0.078	0.936
	No	y = -14.09x1 - 0.5704x3 + 17.02
Mean extrusion	Yes	y = -11.74x1 + 62.93	0.039	0.039			0.696
	No	y = -0.0354x1 + 0.6417