. 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 II.

Group comparisons of the peak and mean hydrostatic pressure profiles of the elements representing the chondro-osseous interface of the patella and femur

	Patella			Femur

	PPP (SD)	Control (SD)	Mean difference (95% CI)	PPP (SD)	Control (SD)	Mean difference (95% CI)
Peak hydrostatic pressure
Stress @ 15°	2.0 (0.5)	1.3 (0.5)	0.6^* (0.1–1.1)	2.1 (0.5)	1.4 (0.4)	0.6^* (0.2–1.1)
Stress @ 45°	3.2 (0.8)	2.7 (0.7)	0.4 (−0.3–1.2)	3.7 (1.2)	3.0 (0.6)	0.7 (−0.3–1.8)
Collapsed across angles (95% CI)	2.6 (2.2–2.9)	2.0 (1.7–2.3)	0.5^* (0.1–1.0)	2.9 (2.5–3.3)	2.2 (1.8–2.6)	0.7^* (0.1–1.3)
Mean hydrostatic pressure
Stress @ 15°	0.8 (0.2)	0.6 (0.2)	0.2^* (0.1–0.4)	0.8 (0.1)	0.6 (0.1)	0.2^* (0.1–0.3)
Stress @ 45°	1.2 (0.3)	0.9 (0.2)	0.3^* (0.1–0.5)	1.3 (0.3)	1.1 (0.2)	0.2 (−0.1–0.5)
Collapsed across angles (95% CI)	1.0 (0.9–1.1)	0.8 (0.6–0.9)	0.3^* (0.1–0.4)	1.1 (0.9–1.2)	0.9 (0.7–1.0)	0.2^* (0.1–0.4)

PFP = patellofemoral pain group.

Hydrostatic pressure is reported as mean value across all subjects, with units of MPa.

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