- Discussion:
- AKA - NSNA, Cat-Cam, with a narrower medial - lateral designs will share load w/ gluteal structures & greater trochanteric;
- ischium and the ramus are contained within the socket of these newer, more anatomic, and more functional designs;
- narrow medial-lateral above knee socket designs attempt to solve the problems of quadrilateral socket by contouring posterior wall to set
the ischium down inside the socket, not up on brim;
- wt is transferred to the gluteal muscle mass and lateral thigh instead of the ischium;
- eliminates need for anterior pressure from high anterior wall;
- attention is then focused on a narrow medial lateral contour to attempt to better hold the femur in adduction, and to minimize the relative
motion between the limb and the socket