The problem
An unexpected step requires sensing foot contact and choosing the leg’s next movement. How can a prosthesis return that information while following the user’s control? The 2025 review proposes a bidirectional system combining touch and proprioception, the sense of limb position and movement. In a separate three-participant treadmill experiment, restored foot sensation improved several recovery measures for two participants; the third showed little benefit.[1] [2]
Scope
Bidirectional lower-limb interfaces integrating voluntary control with tactile and proprioceptive feedback for noncyclic movement and balance, with robust everyday operation.
What remains open
Why it matters
Useful feedback could make prosthetic movement less demanding.[1]
The intended benefit is usable information and control with less cognitive effort, rather than sensation for its own sake.[1]
Definitions
2 terms
proprioception
The sense of a limb’s position and movement. For a prosthetic leg, it provides information that touch at the foot alone may not supply.[1]
bidirectional system
An interface with information flowing both ways: the user sends movement commands, and the prosthesis returns sensory information.[1]
Sources
- Somatosensory restoration and neural control strategies in lower-limb prostheses
Notes on Somatosensory restoration and neural control strategies in lower-limb prostheses
Review distinguishes routine gait assistance from voluntary control and integrated sensory feedback.
- A sensory neuroprosthesis enhances recovery from treadmill-induced stumbles for individuals with lower limb loss
Notes on A sensory neuroprosthesis enhances recovery from treadmill-induced stumbles for individuals with lower limb loss
Small human experiment reports changes in stumble recovery; everyday fall reduction remains a potential benefit.