Table 2.

Mean Western Ontario and McMaster Universities (WOMAC) OA Index scores, knee-specific impairments, and gait characteristics.

	No PFOA (N = 24)	Mild PFOA (N = 38)	Severe PFOA (N = 44)
WOMAC Total Score	26.5 (15.0)	30.3 (15.2)	32.5 (18.4)
WOMAC Physical Function Score	17.8 (11.3)	21.7 (11.5)	22.3 (13.5)
WOMAC Pain Score	5.6 (2.9)	5.6 (3.2)	6.8 (4.2)
WOMAC Stiffness Score	3.1 (1.7)	3.1 (1.4)	3.4 (1.8)
Quadriceps Strength (Nm/kg)	1.9 (0.4)	1.7 (0.5)	1.4 (0.4)*†
Knee Extension Range of Motion (degrees)	−2.1 (5.0)	−5.4 (6.1)	−5.9 (5.8)
Gait Velocity (m/s)	1.3 (0.1)	1.3 (0.2)	1.2 (0.2)
Step Length (m)	0.70 (0.08)	0.68 (0.08)	0.65 (0.08)

PFOA = Patellofemoral Osteoarthritis; Values are mean (SD).

All analyses were adjusted for gender, BMI and radiographic tibiofemoral joint disease severity.

^*Significantly different than “No PFOA” group

^†Significantly different than “Mild PFOA” group