Prosthetics Orthotics Design: AFO_orthosis
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 | value typical |
|---|---|---|---|---|---|---|---|---|
| AFO_orthosis | alignment_plantar_dorsiflexion | design_spec | AFO plantarflexion/dorsiflexion set angle | Solid AFO: set neutral (90 deg) or slight dorsiflexion (5 deg) for foot clearance. Adjust for spasticity. | degrees | 95 | 85 | 90 |
| AFO_orthosis | posterior_leaf_spring_stiffness | functional | PLS-AFO bending stiffness (trimline-dependent) | PLS stiffness depends on material (polypropylene/carbon), thickness, and trimline. Controls resistive plantar-flexion moment. | N_m_per_deg | 5 | 1 | 2.5 |
| AFO_orthosis | structural_load_stance | walking_stance_phase | AFO — ankle-foot orthosis stance axial load (P4 user) | Posterior leaf spring or solid AFO. Carries partial BW. 80 kg user BW = 785 N. | N | 1,000 | 600 | 780 |
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