Prosthetics Orthotics Design: transtibial_prosthesis
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 | notes | unit | value max | value min |
|---|---|---|---|---|---|---|---|
| transtibial_prosthesis | alignment_tilt_coronal | bench_alignment | Alignment tolerance — socket tilt in coronal plane (medial/lateral) | Coronal malalignment > 2 deg causes excessive lateral socket forces and pistoning. | degrees | 2 | 0 |
| transtibial_prosthesis | alignment_tilt_sagittal | bench_alignment | Alignment tolerance — socket tilt in sagittal plane (forward/back) | Initial bench alignment tolerance. Fine-tuned dynamically. PTB socket: 5-7 deg flexion standard. | degrees | 3 | 0 |
| transtibial_prosthesis | alignment_translation_AP | bench_alignment | Alignment tolerance — foot AP translation relative to socket | Foot set 10-15 mm anterior to mid-ankle for typical walking. Adjust for stability vs roll-over. | mm | 10 | 0 |
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