Table 2. Descriptive analysis of MRI Group (control group).

	n	mean	std dev	sum	minimum	maximum
tibia (proximal axis)	63	7.52	0.66	474.09	5.40	8.70
height (PCL tibia insertion height)	63	1.19	0.22	75.08	0.70	1.73
width (PCL tibia insertion width)	63	1.44	0.25	90.97	0.90	2.00
Y1 (U width / tíbial axis)	63	19.24	3.17	1212.00	11.11	27.12
Y2 (U heigth / tíbial axis)	63	15.93	3.28	1004.00	8.97	31.48
Y3 (area)	63	1.72	0.43	108.25	0.98	2.89
Y3*	63	0.99	0.079	62.43	0.83	1.17
Y4 (U width / U height)	63	1.25	0.33	79.04	0.60	2.00

* variable transformed to logarithms, aiming to homogenize the variances.