Sockets for AKA

What are the two major kinds of AKA socket designs?

1. Quadrilateral transfemoral socket (quad socket): Narrow AP and wide mediolat, prominent bulge over Scarpa's triangle for wide pressure distribution, ischial tuberosity on top of post brim. Disadvantages are discomfort while sitting, skin irritation at ischium and pubis, poor cosmesis, poor control of residual limb.

2. Narrow mediolateral/ischial containment/CAT-CAM socket: more normal anatomic alignment with ischial tuberosity contained in socket. Advantages include increased comfort in groin area, can accommodate smaller residual limb, more efficient ambulation. Disadvantages include expense.