Table 3.
Within and between group comparisons of change in knee variables (degrees)
| ADFH (N = 25 limbs) | ADFH/PTS (N = 17 limbs) | Change between groups | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pre mean (sd) | Post mean (sd) | Change (sd) | p-value for change* | Pre mean (sd) | Post mean (sd) | Change (sd) | p-value for change* | p-value unadjusted* | p-value adjusted*,** | 95% Confidence Interval adjusted** | |
| Popliteal angle (degrees) | 51 (13) | 39 (13) | −12 (11) | < 0.001 | 62 (10) | 38 (9) | −24 (12) | < 0.001 | 0.005 | 0.31 | −14.1 to 4.5 |
| Knee extension ROM (degrees) | −13 (5) | −5 (7) | 8 (7) | < 0.001 | −19 (8) | −4 (7) | 15 (9) | < 0.001 | 0.03 | 0.19 | −2.2 to 11.6 |
| Maximum knee extension stance (degrees) | −31 (9) | −15 (18) | 16 (17) | < 0.001 | −51 (16) | −17 (14) | 34 (19) | < 0.001 | 0.01 | 0.53 | −10.7 to 21.0 |
| GDI | 68 (9) | 74 (11) | 6 (8) | < 0.001 | 59 (12) | 73 (11) | 13 (12) | < 0.001 | 0.05 | 0.54 | −6.1 to 11.6 |
| Rate of change in knee extension ROM (degrees/month) | 0.52 (0.37) | 1.02 (0.71) | 0.02 | 0.27 | −0.18 to 0.63 | ||||||
ADFH, anterior distal femoral hemiepiphysiodesis; GDI, Gait Deviation Index; PTS, patellar tendon shortening surgery; ROM, range of motion; PTS, patellar tendon shortening
*
Linear mixed model
**
Adjusted analysis controls for preoperative popliteal angle, knee extension ROM and maximum knee extension in stance