<s>[INST] I have an osteochondral defect of the navicular bone...basically a piece of this dead bone has partially peeled away. there is very little cartilege left. I am a 20-year-old professionally training ballerina. Also had an os trignonum surgical removed at the back of my heal. I have basically been told that this new condition is basically career ending. I have pain even when I walk. I often wear a boot cast in order to relieve the pain when I walk a lot. Can they not go in an remove the piece of bone that has partially peeled away to relieve the rubbing of the bone on bone? There is no blood supply...they told me the navicular bone is dead. [/INST] Hi, particular bone forms important joint in middle of foot and play a very vital role in mid-movements of foot. Once it is damaged and ?avascular, it has to collapse and lead to painful restriction of movements. After very detailed assessment by your expert orthopaedician, may suggest the extent of damage and residual movements at that joint. If still acceptable range is there but painful, some nonsurgical treatment may be helpful failing with surgical fusion of joint may b the answer.thanks.you're most welcome for any further query. </s>