Prosthetics Orthotics Design: transtibial prosthesis
structural load P4 CI to structural load static ultimate P4
Structural design loads, socket interface pressures, alignment tolerances, and component specifications for prosthetic limbs and orthotic devices. Covers transtibial (below-knee) and transfemoral (above-knee) prostheses, KAFO/AFO orthotics, and upper-limb prostheses. ISO 10328 cyclic load levels P3/P4/P5/P6, K-level activity classifications K0-K4, peak ground reaction forces, socket interface pressures by tissue type, and alignment tolerances. Per ISO 10328:2016, ISO 22523:2006, Frossard mechanical loading studies, CMS K-level definitions.
| device type | design parameter | condition | description | unit | value max | value min | value typical |
|---|---|---|---|---|---|---|---|
| transtibial prosthesis | structural load P4 CI | cyclic test 1e6 cycles | ISO 10328 Condition I cyclic load — P4 class (body mass <= 80 kg) | N | 2,900 | 2,500 | 2,700 |
| transtibial prosthesis | structural load P4 CII | cyclic test 1e6 cycles | ISO 10328 Condition II cyclic load — P4 class | N | 2,013 | 1,700 | 1,800 |
| transtibial prosthesis | structural load P5 CI | cyclic test 1e6 cycles | ISO 10328 Condition I cyclic load — P5 class (body mass <= 100 kg) | N | 3,200 | 2,900 | 3,000 |
| transtibial prosthesis | structural load P5 CII | cyclic test 1e6 cycles | ISO 10328 Condition II cyclic load — P5 class | N | 2,200 | 2,013 | 2,100 |
| transtibial prosthesis | structural load P6 CI | ultimate static test | ISO 10328 Condition I ultimate load — P6 class (body mass <= 125 kg) | N | 4,300 | 3,760 | 4,000 |
| transtibial prosthesis | structural load static ultimate P4 | static ultimate test | ISO 10328 static ultimate failure load — P4 | N | 4,500 | 3,750 | 4,000 |
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