Ischial Containment Socket

PURPOSE

To create an above the knee prosthetic socket which allows the prosthetist the ability to control lateral lean, distal pressure, circumferential pressure and vacuum.

This socket design does not impinge on the pelvis when the hip is moved because it has lower edges than typical transfemoral sockets. The socket is as flexible as possible, allowing muscles to move comfortably within the socket as they contract during activity and to improve comfort during sitting.

PROBLEM

The quadrilateral socket design does not control lateral lean of above the knee prosthesis. However, it does offer the prosthetist the ability to control weight bearing on the distal end of the stump. It also allows for easy vacuum fits.

The ischial containment socket design controls lateral lean, but is is sometimes difficult to obtain vacuum fit. Many prosthetists have to use silicone liners to achieve vacuum. Patients find liners to be cumbersome and hard to don. Liners can introduce rotation into the patients’ gait pattern, especially if the stump is flabby.

Also, the ischial containment socket design makes it difficult to regulate distal pressure. Increasing circumferential pressure can cause patient discomfort, especially in the groin if distal end bearing and circumfertenial pressures are not balanced.

RESULT

The socket is held securely to the leg by suction from a vacuum pump, which makes for a firmer connection between the residual limb and prosthesis. Increased comfort, hip range of motion, and connectivity between the residual limb and prosthesis  results in better functional performance for individual.

Two hundred (200) above the knee patients have been successfully fitted with the Q.I.C. Socket with .05% rejections.