Dr. Early uses the revision core from MTF made of dense, cancellous bone to perform this shear blocking technique for the calcaneocuboid joint. The calcaneocuboid joint is one that has a lot of sliding movement, which leaves it unstable as a result of injury or overuse. When proper stability is unable to be reached by non-surgical intervention, calcaneal revision cores can be implanted to stabilize the joint.
![](https://i.ytimg.com/vi/a4W2tlxRPIc/maxresdefault.jpg)