Table 1:

Material properties of the collagen fibrils from positional RTTF and energy-storing FDL tendons. The peak modulus for both fibril types was the same. Collagen fibrils from energy-storing tendons exhibited a greater yield strain, yield stress, and post-yield modulus in terms of percentage of the fibril’s peak modulus. The post-yield modulus of energy-storing fibrils was also greater than positional fibrils, but the difference was not statistically significant. Collagen fibrils from positional tendons had a greater wet fibril diameter. Mean ±SD.

	Positional	Energy-storing	p - value
Peak modulus (MPa; Mean±SD)	200±100	200±100	0.313
Yield strain (%; Mean±SD)	24±7	50±20	0.00228
Yield stress (MPa; Mean±SD)	20±10	60±20	<0.001
Fibril wet diameter (nm; Mean±SD)	500±100	350±90	<0.001
Post-yield modulus (MPa; Mean±SD)	50±30	70±50	0.155
Post-yield modulus, percentage of fibril’s peak modulus (%; Mean±SD)	33±6	40±9	0.0237