title: Os trigonum as a cause of tarsal coalition.
mesh_terms: D000293:Adolescent; D006801:Humans; D007592:Joint Diseases / Q000601:surgery*; D008297:Male; D013628:Talus / Q000601:surgery; D013639:Tarsal Bones / Q000601:surgery; D013640:Tarsal Joints / Q000601:surgery