Table 7.

Component and rotated component matrices

KOS-ADL factors		Rotated component matrix
		1	2
ADL1	Pain	0.40	0.68
ADL2	Stiffness	0.31	0.71
ADL3	Swelling	0.09	0.78
ADL4	Giving way, buckling, or shifting of the knee	0.19	0.73
ADL5	Weakness	0.24	0.71
ADL6	Limping	0.45	0.60
ADL7	Walk	0.70	0.39
ADL8	Go up stairs	0.76	0.33
ADL9	Go down stairs	0.71	0.30
ADL10	Stand	0.68	0.31
ADL11	Kneel on the front of your knee	0.86	0.12
ADL12	Squat	0.82	0.23
ADL13	Sit with your knee bent	0.84	0.17
ADL14	Rise from a chair	0.66	0.36

The two components extracted using principal component analysis. KOS-ADL: Knee Outcome Survey Activities of Daily Living, ADL: Activities of Daily Living