TABLE IV.
Comparison of individual and grouped characterization of stiffness profile including mean and standard deviation of shape and magnitude of moment-angle curves of usual and Free-Flow feet fitted to transtibial bone-anchored prosthesis
| Participant 1 | Participant 2 | Participant 3 | Grouped | |||||
|---|---|---|---|---|---|---|---|---|
| Usual foot | (N=5) | (N=5) | (N=4) | (N=14) | ||||
| Shape | ||||||||
| Duration (%DUR) | ||||||||
| HC to TC | 13±6 | H | 15±2 | L | 25±3 | L | 17±7 | H |
| TC to HO | 71±6 | L | 63±5 | L | 57±3 | L | 64±8 | L |
| HO to TO | 16±3 | L | 22±3 | L | 19±3 | L | 19±4 | H |
| PC | 47±8 | L | 34±3 | L | 59±8 | L | 46±12 | H |
| Curvature (%FLT) | ||||||||
| Linear | 5±4 | 5±5 | 8±13 | 6±7 | ||||
| Convex | 74±29 | 80±24 | 91±13 | 81±23 | ||||
| Concave | 19±25 | 14±18 | 0±0 | 12±19 | ||||
| Magnitude (Nm/Deg) | ||||||||
| K0 | 4.966±0.813 | L | 3.843±0.947 | H | 2.901±0.337 | L | 3.975±1.116 | H |
| K1 | 5.454±0.723 | L | 6.441±1.684 | H | 3.679±1.440 | H | 5.299±1.682 | H |
| K2 | 3.475±1.343 | H | 2.019±0.420 | H | 1.299±2.118 | H | 2.333±1.585 | H |
| IA | −1.978±1.477 | H | −4.423±1.670 | H | −2.380±3.476 | H | −2.966±2.369 | H |
| Free-Flow foot | (N=5) | (N=4) | (N=5) | (N=14) | ||||
| Shape | ||||||||
| Duration (%DUR) | ||||||||
| HC to TC | 12±3 | H | 12±O | L | 13±4 | H | 12±3 | H |
| TC to HO | 76±3 | L | 44±12 | H | 61±10 | L | 61±15 | H |
| HO to TO | 12±4 | H | 44±12 | H | 26±6 | H | 26±15 | H |
| PC | 38±7 | L | 31±3 | L | 37±4 | L | 36±6 | L |
| Curvature (%FLT) | ||||||||
| Linear | 5±2 | 7±8 | 11±5 | 8±6 | ||||
| Convex | 42±20 | 10±4 | 42±8 | 33±20 | ||||
| Concave | 52±20 | 80±10 | 44±12 | 57±21 | ||||
| Magnitude (Nm/Deg) | ||||||||
| K0 | 2.699±0.250 | L | 2.910±0.403 | L | 2.315±0.341 | L | 2.622±0.396 | L |
| K1 | 0.730±0.232 | H | 1.489±0.303 | H | 0.881±0.172 | L | 1.001±0.392 | H |
| K2 | 4.049±0.680 | L | 3.759±1.096 | H | 3.254±0.967 | H | 3.682±0.912 | H |
| IA | 3.319±0.679 | H | 2.270±1.385 | H | 2.373±1.076 | H | 2.681±1.089 | H |
| Difference (Free-Flow foot-Usual foot) | ||||||||
| Shape | ||||||||
| Duration (%DUR) | ||||||||
| HC to TC | −2 | A | −3 | A | −12 | A | −5 | A |
| TC to HO | 5 | B | −19 | A | 4 | B | −3 | B |
| HO to TO | −3 | A | 22 | A | 8 | A | 7 | A |
| PC | −9 | A | −3 | B | −22 | A | −10 | A |
| Magnitude (Nm/Deg) | ||||||||
| K0 | −2.267 | A | −0.934 | A | −0.586 | A | −1.353 | A |
| K1 | −4.724 | A | −4.952 | A | −2.798 | A | −4.299 | A |
| K2 | 0.573 | A | 1.740 | A | 1.955 | A | 1.349 | A |
| IA | 5.297 | A | 6.692 | A | 4.753 | A | 5.647 | A |
N: Number of gait cycles, %SUP: Percentage of support phases, HC: Heel contact, TC: Toe contact, HO: Heel off, TO: Toe off, PC: Point of curvature, %FLT: Percentage of flat foot phases, IA: Index of Anthropomorphicity, H: High PV, L: Low PV, A: Above MCID, B: Below MCID