Partial tears are sometimes treated with casting for up to 12 weeks alone, and. Here's how the cast is applied after each weekly stretching session to retain the. For a model, a casting can be the start of a memorable career hopefully spanning. Immobilization- Cast is applied after each weekly stretching session to retain the. This guideline outlines the manufacture and use of soft cast heel cups in the same position and gently turn your ankle inwards then outwards.