What physical therapy is there for an avulsion fracture?

Depends. Depending on where the avulsion occurs and to what degree and what treatment is rendered, will determine the physical therapy needed. The fracture usually has to heal by rest and splint of some sort or may have to be operatively "fixed" with wire, screw or other means. Then, your doctor will recommend the right physical therapy if needed or indicated. Work with your doctor.
Need more info. Where is the fracture? How lonng ago did it happen?