Variation in the ossification process of the anconeal and medial coronoid processes of the canine ulna.
This morphological and radiographic study investigates the ossification process of the anconeal and medial coronoid processes of the ulna in a sample of 142 dogs ranging in age from neonatal to 44 weeks. The anconeal process was noted to develop by appositional ossification, formation of a separate ossification center, or a combination of both. Several developmental stages of the ossification center of the anconeal process as well as its anatomic position and radiographic appearance are described. Differences have been noted in the shape of this ossification center as well as the ossification process itself. The medial coronoid process develops exclusively by appositional ossification. Unlike ossification of the anconeal process, ossification of the medial coronoid process was completed earlier (p < 0.05) in smaller than in the larger dogs. In smaller dogs, both the medial coronoid and anconeal processes were found to be mature by the age of 16 weeks. In the larger dogs, ossification of the anconeal process was completed not before 14 weeks of age and ossification of the medial coronoid process was completed about 6 weeks later.
Breit
S
S
Institute of Anatomy, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Vienna, Austria. Sabine.Breit@vu-wien.ac.at
Künzel
W
W
Seiler
S
S
D000818:Animals; D001846:Bone Development; D002113:Calcification, Physiologic; D004285:Dogs; D008297:Male; D010012:Osteogenesis; D011859:Radiography; D014457:Ulna / Q000000981:diagnostic imaging / Q000254:growth & development*