Postnatal morphogenesis of the anconeal process of the ulna of swine.
The proximal ulnae of 79 swine ranging in age from 1 day to 2 years were radiographed and those of 46 of the swine were studied histologically. The anconeal process was a hyaline cartilaginous model at birth but ossified by 6 months of age. Endochondral ossification began at the base of the anconeal process and progressed in a pyramidal manner toward its apex. Secondary center of ossification was not observed in porcine anconeal processes examined. A lesion in the anconeal process of a 2-year-old animal was interpreted as a fracture of the anconeal process, and not a fracture of an anconeal physis. Implications of the development of the anconeal process as related to osteochondrosis in swine were discussed.
D000818:Animals; D001846:Bone Development; D002113:Calcification, Physiologic; D005260:Female; D008297:Male; D009024:Morphogenesis; D011859:Radiography; D013552:Swine / Q000254:growth & development*; D014457:Ulna / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000254:growth & development*