Viscoelastic properties of bovine knee joint articular cartilage: dependency on thickness and loading frequency

Table 4 Storage ( E’ ) modulus, at 1 Hz and 90 Hz and cartilage thickness

	n	Thickness (mm)		1 Hz (E’, N/mm²)		90 Hz (E’, N/mm²)
	n	mean	SD	mean	SD	mean	SD
Femoral condyles	24	0.89^A	0.26	37.3^A	8.2	52.3^A	9.2
Patellar groove	17	1.32^B	0.26	35.9^A,B	9.5	44.4^A,B	12.9
Tibial plateau meniscus covered	31	1.10^A,B	0.38	31.7^A,B	11.2	40.9^B,C	13.6
Tibial plateau not meniscus covered	27	2.19^C	0.67	27.6^B	12.0	32.3^C	16.2

The letters^{A, B, C} are used to indicate significant differences between the different regions; where a region does not share a letter they are significantly different (p < 0.05).
n: number of samples tested from each region.