I Need Best Orthopedic Pediatric Oncology , My Daughter Had

I need best orthopedic pediatric oncology , my daughter had a little bump on tibia , was run mind and lesion on tibia cause fracture , she is cast now and will need biopsy to find out is it cyst , when can biopsy be done , just had cast on 9/18 , and who is the best md to do it?