Table 2 Primary and secondary outcomes
|  | Fixed (n = 48) | Mobile (n = 42) | p-value |
|---|---|---|---|
Primary outcomes | |||
 AKP during chair rise median (VAS 0–10) | 0 (0–7) | 0 (0–7) | 0.5 |
 AKP during chair rise (yes/no %) | 22/78 | 14.9/85.1 | 0.3 |
 AKP during stair climb median (VAS 0–10) | 0 (0–8) | 0 (0–7) | 0.8 |
 AKP during stair climb (yes/no %) | 16/84 | 17/83 | 0.9 |
Secondary outcomes | |||
 Ability to rise from chair (able/unable %) | 97.9/2.1 | 95.2/4.8 | 0.6* |
 Ability to climb stairs (able/unable%) | 97.9/2.1 | 97.9/4.8 | 0.6* |
Range of motion (ROM) (degrees) | |||
 Flexion | 110 (80–130) | 110 (85–130) | 0.9 |
 Extension | 0 (−10–5) | −0 (−10–5) | 0.7 |
 Total | 110 (70–130) | 110 (85–130) | 0.9 |
KSS | |||
 Pain | 94.0 (62–100) | 95 (61–100) | 0.8 |
 Function | 80 (30–100) | 87.5 (5–100) | 0.8 |
 Total | 174.5 (102–200) | 178.5 (95–200) | 0.8 |
RAND-36 | |||
 Physical functioning | 55 (5–100) | 55 (0–100) | 0.6 |
 Social role functioning | 75 (25–100) | 75 (0–100) | 0.7 |
 Physical role functioning | 25 (0–100) | 25 (0–100) | 0.7 |
 Emotional role functioning | 100 (0–100) | 67 (0–100) | 0.3 |
 Mental health | 68 (4–100) | 72 (20–100) | 0.5 |
 Vitality | 60 (0–100) | 65 (15–90) | 0.9 |
 Bodily pain | 67 (12–100) | 67 (0–100) | 0.7 |
 General health perceptions | 65 (10–95) | 55 (10–95) | 0.6 |
 General health change | 50 (25–75) | 50 (0–100) | 0.6 |
Patellar tilt median (degrees) | |||
 30 degrees flexion | 1 (0–15) | 0.5 (0–17) | 0.4 |
 60 degrees flexion | 0 (0–15) | 0 (0–20) | 0.6 |
 90 degrees flexion | 0 (0–16) | 0 (0–20) | 0.4 |
Patellar tilt mean (degrees + SD) | |||
 30 degrees flexion | 2.56 ± 3.62 | 1.98 ± 3.58 |  |
 60 degrees flexion | 1.96 ± 3.15 | 1.80 ± 3.82 |  |
 90 degrees flexion | 1.81 ± 3.25 | 1.40 ± 3.42 |  |