The Journal of Bone and Joint Surgery, Vol 63, Issue 5 722-725, Copyright © 1981 by Journal of Bone and Joint Surgery, Inc
Some vagaries of the olecranon
MJ Silberstein, AE Brodeur, ER Graviss and A Luisiri
The maturing olecranon of the ulna is readily prone to misinterpretation
because its normal radiographic characteristics may closely resemble those
of fractures, for the following reasons: (1) just prior to ossification of
the olecranon epiphysis, a straight sclerotic edge develops in the
associated metaphysis on the proximal part of the ulna; (2) ossification of
the olecranon begins in two or more centers that commonly fuse with each
other before fusing with the parent bone and that may be separated widely
from the metaphysis in the early stages; and (3) the physis of the
olecranon frequently migrates distally into the joint and may simulate a
fracture line. Features distinguishing the normal olecranon from a fracture
are discussed in this paper.