The document discusses shoes and orthopaedics. It provides details on the normal anatomy of a shoe, including the upper, sole, heel, linings and reinforcements. It describes different shoe styles and discusses surgical footwear. The document outlines how to check if a shoe fits correctly and discusses various modifications that can be made to existing footwear to relieve pain, such as heel pads, metatarsal bars, and rocker bars. It also covers compensating for leg length discrepancies using heel raises.