| AO | Ankle osteoarthritis |
| AFO | Ankle–foot orthosis |
| FES | Functional electrical stimulation |
| EC | Energy consumption |
| PAFO | Passive ankle–foot orthosis |
| SAFO | Semi-active ankle–foot orthosis |
| AAFO | Active ankle–foot orthosis |
| PNAAFO | Passive non-articulating ankle–foot orthosis |
| PAAFO | Passive articulating ankle–foot orthosis |
| ROM | Range of motion |
| COP | Center of pressure |
| FTS | Foot tilting strategy |
| DOF | Degree of freedom |
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