Table 2.
Association of knee buckling and knee shifing/slipping at 60 months with falls at 60 months and at 84 months
| Baseline exposure/predictor (n) | a. Cross-sectional association with falls in the past 12 months at baseline* | ||||
|---|---|---|---|---|---|
| Buckling in past 3 months | 0 falls | 1 fall | ≥2 falls | ||
| N (%) | N (%) | OR (95% CI) | N (%) | OR (95% CI) | |
| 0 (1532) | 1114 (72.7) | 211 (13.8) | Ref -- | 207 (13.5) | Ref -- |
| 1+ (310) | 175 (56.5) | 45 (14.5) | 1.25(0.84-1.86) | 90 (29.0) | 2.00(1.42-2.82) |
| Shifting /slipping in past 3 months | |||||
| 0 (1296) | 975 (73.8) | 175 (13.5) | Ref -- | 164 (12.7) | Ref -- |
| 1+ (546) | 332 (60.8) | 81 (14.8) | 1.08(0.78-1.50) | 133 (24.4) | 1.51(1.12-2.03) |
| Buckling in past 3 months | b. Longitudinal association with falls in the past 12 months at 2 year follow-up† | ||||
|---|---|---|---|---|---|
| 0 falls | 1 fall | ≥2 falls | |||
| 0 (1427) | 1066 (74.7) | 190 (13.3) | Ref -- | 171 (12.0) | Ref -- |
| 1+ (270) | 168 (62.2) | 34 (12.6) | 1.03(0.66-1.60) | 68 (25.2) | 1.98(1.35-2.91) |
| Shifting/slipping in past 3 months | |||||
| 0 (1217) | 907 (74.5) | 162 (13.3) | Ref -- | 148 (12.2) | Ref -- |
| 1+ (480) | 327 (68.1) | 62 (12.9) | 0.92(0.64-1.31) | 91 (19.0) | 1.10(0.78-1.55) |
Models include variables for both buckling and shifting/slipping, plus age, gender, race, clinic, BMI, highest K-L grade, history of knee injury causing limited activity, isokinetic knee extension strength (sex-specific tertiles), vibratory perception threshold at the first MTP joint (sex-specific tertiles), foot/ankle pain (number of locations with pain: 0, 1-2, 3-6), hip pain (yes/no), comorbidity index score (0-10), depression (CES-D score >=16 as depression indicator), used prescription narcotic analgesics in past 30 days (yes/no), used prescription sedative-hypnotic medications in the past 30 days (yes/no), knee buckling in the past 12 months but not in the past 30 days (yes/no), sum of WOMAC pain score in both knees.
84 month clinic visit and telephone contact