Table 2.
Mean VAS pain score by activity, measured at 3 and 6 months postoperatively.
| Activity | 3-month follow up (n = 35) |
6-month follow up (n = 35) |
Difference (95% CI for difference) | p-value | ||
|---|---|---|---|---|---|---|
| Mean ± SD (95% CI for mean) | VASa ≥ 4 n (%) | Mean ± SD (95% CI for mean) | VASa ≥ 4 n (%) | |||
| Ascending 30° slope | 0.9 ± 1.2 (0.5, 1.3) | 1 (2.8%) | 0.2 ± 0.6 (0.04, 0.4) | 0 (0%) | 0.7 ± 1.1 (0.3, 1.0) | <0.001b |
| Running | 1.1 ± 1.2 (0.7, 1.5) | 0 (0%) | 0.4 ± 0.7 (0.2, 0.6) | 0 (0%) | 0.7 ± 0.9 (0.4, 1.0) | <0.001b |
| Ascending stairs | 1.5 ± 1.5 (1.0, 2.1) | 4 (11.4%) | 0.7 ± 1.0 (0.3, 1.01) | 1 (2.8%) | 0.9 ± 1.7 (0.3, 1.5) | 0.01b |
| Descending stairs | 1.7 ± 1.6 (1.1, 2.2) | 5 (14.2%) | 0.5 ± 1.00 (0.2, 0.9) | 1 (2.8%) | 1.1 ± 1.8 (0.5, 1.8) | 0.01b |
| Sitting cross-legged | 0.4 ± 0.9 (0.1, 0.7) | 0 (0%) | 0.1 ± 0.3 (0.1, 0.2) | 0 (0%) | 0.4 ± 0.8 (0.1, 0.6) | 0.01b |
| Sitting one-legged | 0.5 ± 1.2 (0.1, 0.9) | 1 (2.8%) | 0.2 ± 0.9 (0.1, 0.5) | 1 (2.8%) | 0.2 ± 0.8 (−0.04, 0.5) | 0.10 |
| Jumping | 2.2 ± 1.6 (1.7, 2.8) | 8 (22.8%) | 1.0 ± 1.1 (0.6, 1.4) | 2 (5.6%) | 1.2 ± 1.6 (0.7, 1.8) | <0.001b |
| Squatting | 1.5 ± 2.0 (0.9, 2.2) | 5 (14.2%) | 0.4 ± 0.7 (0.2, 0.7) | 0 (0%) | 1.1 ± 1.9 (1.8, 3.4) | 0.01b |
| Kneeling | 3.9 ± 2.9 (2.8, 4.9) | 17 (48.5%) | 2.0 ± 2.5 (1.2, 2.9) | 9 (25.7%) | 1.9 ± 3.6 (0.6, 3.1) | 0.01b |
a
VAS, visual analogue scale for pain. Considerable anterior knee pain was defined as a VAS pain score ≥4.
b
Statistically significant level, with a value < 0.05.