Table 2.

Function, proprioception, structure, and strength variables in controls and OA subjects

	Control	OA	P Value
KOOS
Symptoms	98.9 (2.5)	62.4 (14.6)	<0.001
Pain	99.5 (1.8)	64.4 (14.9)	<0.001
ADL	99.7 (1.3)	70.3 (17.0)	<0.001
KOS-I*
<4	1 (4.3)	15 (40%)	<0.001
4	0 (0)	7 (18%)
5	22 (95.7)	16 (42%)
TTDPM (°)
At 15° flexion (into flexion)	1.1 (1.1)	1.1 (0.8)	0.915
At 15° flexion (into extension)	0.8 (0.4)	0.9 (0.5)	0.355
At 45° flexion (into flexion)	0.9 (0.5)	1.2 (0.7)	0.107
At 45° flexion (into extension)	1.4 (0.9)	1.8 (1.0)	0.092
Medial joint space width, mm	4.3 (0.7)	0.9 (1.5)	<0.001
Alignment (°)	178.5 (2.5)	174.4 (3.8)	<0.001
Stair climbing test, s	10.0 (1.5)	13.7 (5.1)	0.001
Walking speed, m/s	1.6 (0.2)	1.3 (0.2)	<0.001
Quadriceps strength (N/BMI)	25. 4 (10.1)	20.9 (7.2)	0.037

All values are means (SD), except for KOS-I (knee outcome survey/instability item score).

KOOS, Knee Injury and OA Outcome Score; ADL, activities of daily living; TTDPM, threshold to detect passive motion.

^*No. of participants (%).