Table 2 The effect of unloading shoes on plantar forces relative to conventional shoes, and the interaction between shoe condition and foot posture and/or mobility
Plantar force measurements | Conventional shoes, Mean (SD) | Unloading shoes, Mean (SD) | Difference (95%CI) | P value | Interaction (condition*foot posture), P value | Interaction (condition* FMM), P value | Interaction (condition* navicular drop), P value |
|---|---|---|---|---|---|---|---|
Peak lateral heel force, N | 233.0 (68.3) | 263.0 (69.6) | 30.0 (18.1 to 42.0) | < 0.001 | 0.457 | 0.308 | 0.199 |
Peak medial heel force, N | 229.4 (62.5) | 208.9 (57.7) | −20.5 (− 32.3 to − 8.7) | 0.001 | 0.393 | 0.249 | 0.169 |
Peak lateral forefoot force, N | 204.1 (44.4) | 245.4 (52.3) | 41.3 (21.5 to 61.0) | < 0.001 | 0.374 | 0.334 | 0.815 |
Peak medial forefoot force, N | 246.1 (74.8) | 221.8 (63.9) | −24.3 (−41.2 to −7.4) | 0.005 | 0.155 | 0.453 | 0.071 |
Arch index (midstance) | 0.23 (0.04) | 0.21 (0.03) | −0.01 (−0.03 to 0.00) | 0.093 | 0.744 | 0.118 | 0.318 |
CoP x-position (25% stance), mm | 53.0 (5.0) | 55.5 (4.9) | 2.5 (1.4 to 3.6) | < 0.001 | 0.289 | 0.292 | 0.435 |
CoP y-position (25% stance), mm | 78.9 (15.5) | 83.3 (14.7) | 4.4 (0.3 to 8.5) | 0.034 | 0.718 | 0.875 | 0.786 |
Medial – lateral heel peak force ratio | 1.0 (0.3) | 0.8 (0.3) | −0.2 (−0.3 to −0.1) | < 0.001 | 0.175 | 0.117 | 0.051 |