American Journal of Roentgenology, Vol 164, 415-418, Copyright © 1995 by American Roentgen Ray Society
MR imaging of the elbow: normal variant and potential diagnostic pitfalls of the trochlear groove and cubital tunnel
ZS Rosenberg, J Beltran, Y Cheung and M Broker
Hospital for Joint Diseases Orthopaedic Institute, Department of Radiology, New York, NY 10003.
The proximal portion of the ulna includes the olecranon and the coracoid
process, which together form the trochlear groove that articulates with the
distal humerus. The groove is constricted at the junction of the olecranon
and the coracoid process. A thin, transverse, nonarticular ridge intersects
the groove at this junction. Both the constriction of the groove and the
nonarticular ridge may simulate disease on MR imaging of the elbow.