Table 2.

Association of vibratory acuity and quadriceps muscle strength with knee slipping/shifting symptoms

		INCIDENT KNEE SHIFTING/SLIPPING			WORSENING KNEE SHIFTING/SLIPPING
		Adjusted RR (95%CI)	p value		Adjusted RR (95%CI)	p value
Vibratory sense at tibial tuberosity*	Lower n=52/175 (29.7%)	1.23 (0.94, 1.62)	0.1323	Lower n=89/276 (32.2%)	1.13 (0.92, 1.39)	0.247
	Middle n=180/758 (23.7%)	1		Middle n=299/1168 (25.6%)	1
	Greater n=26/137	0.84 (0.57, 1.22)	0.3522	Greater n=48/213 (22.5%)	0.91 (0.69, 1.20)	0.504
		p for linear trend	0.064		p for linear trend	0.175
Quadriceps muscle strength**	Lower n=39/128 (30.5%)	0.83 (0.61, 1.14)	0.2542	Lower n=84/255 (32.9%)	0.92 (0.74, 1.14)	0.4431
	Middle n=195/728 (26.8%)	1		Middle n=311/1119 (27.8%)	1
	Greater n=24/214 (11.2%)	0.48 (0.32, 0.73)	<0.001	Greater n=41/283 (14.5%)	0.64 (0.47, 0.88)	0.006
		p for linear trend	<0.001		p for linear trend	0.047

^*Adjusted model includes age, sex, BMI, race, sum WOMAC knee pain, max KL grade, hip/ankle/foot pain, and vibratory sense

^**Adjusted model includes age, sex, BMI, race, sum WOMAC knee pain, max KL grade, hip/ankle/foot pain, and quadriceps strength