. Author manuscript; available in PMC: 2016 Jun 2.

Published in final edited form as: Osteoarthritis Cartilage. 2010 Dec 21;19(3):287–294. doi: 10.1016/j.joca.2010.12.001

Table III.

Group comparisons of the peak and mean octahedral shear stress profiles of the elements representing the chondro-osseous interface of the patella and femur

	Patella			Femur
	PFP (SD)	Control (SD)	Mean difference (95% CI)	PFP (SD)	Control (SD)	Mean difference (95% CI)
Peak octahedral shear stress
Stress @ 15°	0.6 (0.2)	0.3 (0.1)	0.2^* (0.1–0.4)	0.6 (0.2)	0.4 (0.1)	0.2^* (0.1–0.4)
Stress @ 45°	1.3 (0.7)	0.9 (0.3)	0.4 (−0.1–1.0)	1.2 (0.4)	1.0 (0.2)	0.2 (−0.1–0.5)
Collapsed across angles (95% CI)	1.0 (0.8– 1.1)	0.6 (0.4– 0.8)	0.3^* (0.1–0.6)	0.9 (0.8– 1.0)	0.7 (0.6– 0.8)	0.2^* (0.1–0.4)
Mean octahedral shear stress
Stress @ 15°	0.4 (0.1)	0.2 (0.2)	0.2^* (0.1–0.3)	0.4 (0.1)	0.2 (0.2)	0.2^* (0.1–0.3)
Stress @ 45°	0.6 (0.1)	0.5 (0.1)	0.1 (−0.1–0.2)	0.6 (0.1)	0.5 (0.1)	0.1 (−0.1–0.2)
Collapsed across angles (95% CI)	0.5 (0.4– 0.5)	0.3 (0.3– 0.4)	0.2^* (0.1–0.2)	0.5 (0.4– 0.5)	0.4 (0.3– 0.4)	0.1^* (0.1–0.2)

PFP = patellofemoral pain group.

Octahedral shear stress reported as mean value across all subjects, with units of MPa.

Denotes significant differences from the control group at P < 0.05.