Prosthetic sockets become painful within months as residual limbs change shape

Prosthetic sockets are custom-molded to the shape of an amputee's residual limb at a single point in time, but residual limbs continuously change volume due to weight fluctuation, muscle atrophy, fluid retention, and temperature. Within months, the socket no longer fits: 48% of amputees and 66% of clinicians cite socket fit as the leading factor derailing rehabilitation. A poorly fitting socket causes localized pressure sores, skin breakdown, and compensatory gait patterns that lead to chronic back and hip pain. This matters because the socket is the sole mechanical interface between the human body and the prosthesis -- if it fails, the entire device is unusable. The problem persists because socket fabrication is still a manual, artisanal process: a prosthetist takes a plaster cast or scan, hand-carves adjustments, and produces a rigid shell. There is no embedded sensing, no dynamic adjustment, and no feedback loop. Amputees must book an appointment, travel to a clinic, wait weeks for a refit, and repeat the cycle every few months -- a process that is expensive, slow, and structurally incapable of tracking the body's continuous changes.