Table 5. Changes in Dynamic Foot Pressure Distributions.
| Parameters | Before injection | 1 month after injection | 4 months after injection | ANOVA p value |
|---|---|---|---|---|
| Foot contact pattern | ||||
| Total contact area (cm2) | 50.79 (±14.09) | 57.79 (±15.94)* | 54.70 (±16.81) | 0.005 |
| Contact length (cm) | 14.98 (±2.48) | 15.90 (±2.94)* | 15.68 (±2.84) | 0.008 |
| Contact width | ||||
| Forefoot (cm) | 6.18 (±0.81) | 6.33 (±0.78) | 6.21 (±0.89) | 0.186 |
| Midfoot (cm) | 2.73 (±0.71) | 2.71 (±0.90) | 2.63 (±0.85) | 0.755 |
| Hindfoot (cm) | 3.19 (±1.40) | 3.93 (±1.27)* | 3.81 (±1.20) | 0.009 |
| Center of pressure index | 1.67 (±0.47) | 1.23 (±0.28)* | 1.29 (±0.30)* | <0.001 |
| Relative impulse of PTIs | ||||
| Medial forefoot (%) | 20.28 (±9.72) | 21.41 (±9.21) | 21.65 (±10.28) | 0.494 |
| Lateral forefoot (%) | 27.09 (±7.80) | 18.99 (±7.07)* | 21.48 (±7.61)*† | <0.001 |
| Medial midfoot (%) | 8.03 (±5.38) | 12.71 (±3.44)* | 11.89 (±6.37) | 0.006 |
| Lateral midfoot (%) | 28.27 (±13.26) | 21.78 (±10.31)* | 24.60 (±9.59)*† | <0.001 |
| Heel (%) | 16.33 (±10.38) | 25.11 (±12.19)* | 20.39 (±14.25) | <0.001 |
| Coronal index | -27.05 (±21.69) | -6.65 (±17.31)* | -12.54 (±15.50)*† | <0.001 |
| DFPI (%) | 26.39 (±15.90) | 38.85 (±18.03)* | 32.56 (±20.22) | 0.001 |
Center of pressure index, (area in lateral column)/(area in medial column); Coronal index, (relative impulses in medial forefoot and medial midfoot)-(relative impulses in lateral forefoot and lateral midfoot); PTI, pressure time integral; DFPI, dynamic foot pressure index [heel impulse/(heel impulse+forefoot impulse)×100].
Data are presented as mean (±standard deviation).
*Post hoc analysis, compared with baseline data, p<0.05, †Post hoc analysis, compared with after 1 month data, p<0.05.