Table II.
Descriptive statistics of subjects with PFJ OA and controls without TFJ or PFJ OA
| All | PFJ OA | Control | ||
|---|---|---|---|---|
| N = 99 | N = 56 | N = 43 | ||
| Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | ||
| Sex, Male/Female | 37/62 | 14/42 | 23/20* | |
| Age, years | 52.0 (49.9, 54.2) | 55.0 (52.2, 57.7) | 48.2 (45.1, 51.4)* | |
| BMI, kg/m2 | 24.6 (23.9, 25.2) | 24.6 (23.7, 25.6) | 24.5 (23.6, 25.5) | |
| OA type, Isolated PFJ OA/Mixed PFJ & TFJ OA | 34/22 | 34/22 | ||
| KOOS | ||||
| Pain | 86.4 (82.3, 89.5) | 84.2 (79.7, 88.7) | 89.3 (85.2, 93.4) | |
| Symptoms | 86.7 (83.7, 89.7) | 84.6 (80.2, 89.0) | 89.4 (85.4, 93.3) | |
| Activities of Daily Living | 91.8 (89.3, 94.3) | 89.9 (86.2, 93.6) | 94.4 (91.3, 97.4) | |
| Sports | 82.1 (77.9, 86.3) | 78.2 (71.8, 84.5) | 87.1 (82.3, 92.0)* | |
| Quality of Life | 76.0 (71.3, 80.7) | 73.3 (66.5, 80.1) | 79.5 (73.2, 85.7) | |
| Walking biomechanics | ||||
| Walking speed, m/s | 1.52 (1.48, 1.57) | 1.50 (1.43, 1.57) | 1.56(1.50, 1.61) | |
| Peak KFM, Nm/kg m | 0.36 (0.34, 0.39) | 0.36 (0.32, 0.40) | 0.37 (0.32, 0.41) | |
| KFM impulse, Nm ms/kg m | 53.6 (48.6, 58,6) | 52.7 (47.1, 60.4) | 53.5 (45.6, 61.3) | |
| Cartilage T1ρ relaxation times | ||||
| Trochlea | Whole compartment, ms | 32.9 (32.2, 33.7) | 33.1 (32.1, 34.2) | 32.6 (31.5, 33.8) |
| Superficial layer, ms | 36.0 (35.1, 36,8) | 36.4 (35.2, 37.6) | 35.4 (34.1, 36.7) | |
| Deep layer, ms | 29.8 (29.0, 30.5) | 29.8 (28.8, 30.9) | 29.6 (28.5, 30.8) | |
| Patella | Whole compartment, ms | 33.4 (32.6, 34.2) | 34.2 (33.3, 35.2) | 32.3 (31.1, 33.6)† |
| Superficial layer, ms | 37.1 (36.3, 38.0) | 37.9 (36.8, 38.2) | 36.1 (34.7, 37.6) | |
| Deep layer, ms | 29.9 (29.1, 30.7) | 30.8 (29.8, 31.9) | 28.7 (27.4, 29.9)† | |
| Cartilage T2 relaxation times | ||||
| Trochlea | Whole compartment, ms | 25.5 (25.0, 26.0) | 25.8 (25.0, 26.5) | 25.1 (24.6, 25.7) |
| Superficial layer, ms | 27.3 (26.7, 27.8) | 27.7 (26.9, 28.5) | 26.7 (26.1, 27.4) | |
| Deep layer, ms | 23.7 (23.1, 24.2) | 23.9 (23.0, 24.7) | 23.4(22.8, 24.1) | |
| Patella | Whole compartment, ms | 24.4 (23.8, 24.9) | 24.6 (23.9, 25.4) | 24.0 (23.2, 24.8) |
| Superficial layer, ms | 26.7 (26.2, 27.3) | 27.0 (26.2, 27.7) | 26.5 (25.6, 27.3) | |
| Deep layer, ms | 22.1 (21.5, 22.6) | 22.4 (21.6, 23.2) | 21.6 (20.8, 22.4) | |
CI, confidence interval.
Variables that reach statistical significant difference between PFJ OA and control groups (P < 0.05) are in bold.
*
Significant differences between PFJ OA and control groups (P < 0.05).
†
Significant differences between PFJ OA and control groups after adjusting for age, sex and BMI (P < 0.05).