. Author manuscript; available in PMC: 2015 Apr 1.

Published in final edited form as: Osteoarthritis Cartilage. 2014 Feb 6;22(4):527–534. doi: 10.1016/j.joca.2014.01.008

Table IV.

Association of any symptoms of knee instability in the past 3 months with outcomes of interest

Outcome of interest, n (%)	No buckling and no sensations of instability without buckling (n = 1360)	Buckling or sensations of instability without buckling (n = 758)
Fear of falling^, n (%)*	349/1359 (25.7)	356/756 (47.1)
Adjusted PR (95% CI)^‡	REF	1.5 (1.3, 1.7)
Poor balance confidence (ABC score^* ≤ 67), n (%)	103/1359 (7.6)	173/756 (22.9)
Adjusted PR (95% CI)^‡	REF	1.9 (1.5, 2.4)
Limit activity due to concern about knee buckling, n (%)	42/1360 (3.1)	314/758 (41.4)
Adjusted PR (95% CI)^‡	REF	10.2 (7.3, 14.1)
WOMAC physical score^† ≥ 28.0, n (%)	75/1348 (5.6)	198/738 (26.8)
Adjusted PR (95% CI)^‡	REF	1.9 (1.5, 2.5)

Missing data on three people for this outcome of interest.

^†

Missing WOMAC physical ability score for 31 people.

^‡

Adjusted for sex, age, BMI, co-morbidity, knee pain severity. Further adjusting for ROA, quadriceps strength, and history of knee injury or surgery materially did not change the estimates.