Hip Disarticulate


Hip Disarticulate/Hemipelvectomy/ Transpelvectomy NPS (vacuum) Prosthetic System

POA’s patented NPS socket system for hip disarticulate amputations was created by Stan Patterson for Sgt. Josh Olson (photo at right) at the request of Walter Reed Army Medical Center (WRAMC). Olson, who lost his leg as the result of an RPG blast in Iraq, wanted to remain in the Army, but the hip disarticulate prosthetic system he was wearing was rigid, bulky, and so uncomfortable that he found it hard to function in. So in 2004, WRAMC sent Josh to POA to create something that would serve him better. Fourteen-hour days and several prototypes produced a low-profile model that was not visible through Olson’s uniform. A custom silicone liner created an effect like a suction cup in a socket that was half the size of previous models. The fit was intimate and secure, preventing the socket movement that beset old versions. Improvements to the socket interface have evolved since then. Following video shows two patients using our most recent design which eliminates silicone liner and incorporates silicone onto the socket itself.

Overview: Prosthetic Fitting Process for HD/HP/TP Amputees

A cast impression is formed and socket is designed from that, providing a precise and comfortable fit. Additional components are added and the resulting prosthesis provides the highest degree of control possible, allowing the wearer to walk with confidence–and sit in comfort!