High validity of measuring the width and volume of medial meniscal extrusion three-dimensionally using an MRI-derived tibial model

Journal of Experimental Orthopaedics

Table 2 Demographic of volume and cross-sectional area of the medial tibial plateau models and volume and width of the medial meniscal extrusion

Variable		CT-derived model			MRI-derived model			P value	Effect size	Power
Variable		Representative value		P value	Representative value		P value	P value	Effect size	Power
Medial tibial plateau	Volume (mm³)	13,031	(5300)	0.013	12,628	(4373)	0.019	0.912	0.08	0.91
	Cross-sectional area (mm²)	1484	[1338, 1630]	0.211	1,493	[1340, 1646]	0.122	0.906	0.04	0.91
Medial meniscal extrusion	Volume (mm³)	942.6	[597.7, 1287.6]	0.540	916.2	[557.9, 1274.6]	0.569	0.938	0.05	0.91
	Width (mm)	4.2	[1.9, 6.5]	0.242	4.5	[2.2, 6.9]	0.155	0.967	0.12	0.80

Volume of the medial tibial plateau is shown as median (inter quartile range), and the other are shown as means [95% confidence interval]. P-values of CT- and MRI-delived model are based on the Shapiro-Wilk test