This form of rear foot extrinsic posting for an orthotic device is called Stripline posting. It is used in a young soccer player to maintain stability in very tight soccer cleat.
This is called Stripline Posts for Improving Stability but keeping volume low. The image shows that a normal post is applied and then the back 1/2 is removed.
This is the side view of the same image. The important frontal plane stability is maintained in stripline posting.
