Altered Knee Joint Mechanics in Simple Compression Associated with Early Cartilage Degeneration

Table 1

Material properties for the normal tissues (modulus: MPa; permeability: 10⁻³ mm⁴/Ns). The x is the primary fiber direction, that is, the split-line direction for the superficial zone, the depth direction for the deep zone for articular cartilage, and the circumferential direction for the meniscus. The y and z are normal to the primary fiber direction. The properties are the same in the y and z directions.

Tissue	Fibrillar matrix, (1)		Nonfibrillar matrix		Permeability, (2)
	𝐸𝑥	𝐸𝑦 or 𝐸𝑧	𝐸𝑚	𝜐𝑚	𝑘𝑥	𝑘𝑦 or 𝑘𝑧
Femoral cartilage
Deep zone	3+1600𝜀𝑥	0.9+480𝜀𝑦/𝑧	0.80	0.36	1.0	0.5
Middle zone	2+1000𝜀𝑥	2+1000𝜀𝑦/𝑧	0.60	0.30	3.0	1.0
Superficial zone	4+2200𝜀𝑥	1.2+660𝜀𝑦/𝑧	0.20	0.16	1.0	0.5
Tibial cartilage	2+1000𝜀𝑥	2+1000𝜀𝑦/𝑧	0.26	0.36	2.0	1.0
Menisci	28	5	0.50	0.36	2.0	1.0
Bones	E = 5000		𝜐 = 0.30