Separation of the coracoid epiphysis of the scapula
Transactions of the Royal Academy of Medicine in Ireland
I HAVE used this term, coracoid epiphysis of the scapula, for convenience, well knowing that the independent centre of the coracoid is essentially different in its homology from the ordinary epiphyses, and that on this ground objection may be taken to its employment. In the pathological sense this specimen is an epiphysary separation, and agrees in its details with the lesion as we see it in the long bones. The cartilage uniting the coracoid to the scapula has separated from the latter,
... the latter, carrying with it in one part a small scale of bone; in other words, the line of separation is on the proximal side of the epiphysary cartilage, and any further secondary fracture of bone is seated in the diaphysis, as constantly occurs in the similar injuries of the long bones. My object in bringing forward the specimen is to record its existence, for I have not found any record of a similar case. The following is the category of epiphysary separations admitted by Malgaigne as having been proved by dissection to exist :-" The epiphysary separations which have been attested by dissection are: Ist, of both extremities of the humerus; 2nd, of the inferior extremity of the radius; Brd, of both extremities of the femur; 4th, of both extremities of the tibia." To this list we can add the epiphysis of the great trochanter, of the inferior extremity of the fibula and of the ulna. I have shown that the rarely-observed secondary centre of ossification of the astragalus may be detached, and I can now add to the list the detachment of the coracoid secondary centre.