RADIOGRAPHIC ANATOMY AND TECHNIQUE FOR ARTHROGRAPHY OF THE CUBITAL JOINT IN CLINICALLY NORMAL DOGS

A technique for arthrography of the cubital joint in clinically normal large-breed dogs was developed with the objective of improving visual ization of the articular margin of the medial coronoid process. A late ral approach to the cubital joint for injection of contrast medium was selected. Arthrography of 24 cubital joints was performed by using 14 dogs. Twelve combinations of iodinated contrast medium, consisting of various concentrations (3) and volumes (4), were used. Two sets of ar thrograms for each of the 12 combinations of contrast medium were obta ined. Five radiographic views were used for each set. All arthrograms were examined by 3 evaluators, and each articular surface received a n umerical rating for how well it could be seen in each view. Results of the evaluation indicated that low volumes of contrast medium were pre ferable to high volumes, with 2 ml providing the best visualization. C oncentration of iodine seemed less important than did volume. The nume rical ratings also indicated that the articular margin of the coronoid process was clearly observed a maximum of only 24% of the time on a s lightly supinated mediolateral projection. The articular margins of th e head of the radius, trochlea humeri, and trochlear notch were well v isualized > 90% of the time. Arthrography of the cubital joint was tec hnically easy to perform, and complications were not encountered, but arthrographic anatomy of the cubital joint is complex. Potential uses for arthrography of the cubital joint include diagnosis of osteochondr osis, intraarticular fragments, and joint capsule ruptures.