Transfixation pin casting is a modified form of external skeletal fixation used to repair lower limb fractures in large animal patients. Transfixation pins are placed proximal to the fracture and are incorporated into a cast that includes the foot. Fiberglass cast material is most commonly used. In this application, the cast becomes somewhat analogous to external bars of a fixation frame transferring loads through the foot to the pins above the fracture site – thus providing stability to the fracture. IMEX® was the first company to produce transfixation pins specific to large animal application.