What's wrong with current prosthetic?

 
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Wrong Size
In addition to wearing climbing shoes to add traction, amputee climbers often flip their prosthetic foot because of its large size.

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Passive Articulation
Passive articulation works well for repetitive movements like running. But for sports like climbing, it requires limited ankle articulation to adapt to different surfaces.

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Strength Loss
Rock climbing is a strenuous sport, and it can be difficult for amputees who are missing strength from their leg muscles.