The Collaborative International Dictionary of English v.0.48:

Orthopedist \Or*thop"e*dist\, n. (Med.)
   One who prevents, cures, or remedies deformities, esp. in
   children.
   [1913 Webster]

WordNet (r) 3.0 (2006):

orthopedist
    n 1: a specialist in correcting deformities of the skeletal
         system (especially in children) [syn: orthopedist,
         orthopaedist]