Osteochondrosis is a disturbance of normal endochondral ossification characterized by abnormal maturation of the growing cartilage. Osteochondrosis is termed OCD when cartilage fragmentation occurs.1 Osteochondritis dissecans commonly occurs on the MAHC. In addition to lesions of the medial coronoid or anconeal processes, dogs with elbow dysplasia may have OCD of the MAHC or may have an abnormal surface on the medial humeral condyle without OCD. That abnormal surface is often referred to as a kissing lesion. Osteochondritis dissecans of the humeral condyle is a genetic disease for which heritability ranges from 0.3 to 0.77 in previous reports.2,3 Osteochondritis dissecans has a lower prevalence than fragmentation of the MCP.4 It occurs almost exclusively in dogs weighing > 20 kg as adults.3,5 When present, OCD often affects both elbow joints. Eleven of 21 (52%) dogs with elbow joint OCD were affected bilaterally in 1 report.6 The radiographic signs of elbow joint OCD include abnormal shape of the medial aspect of the humeral condyle and a semilunar or conical radiolucency potentially surrounded by a radiopaque area.7 In a report8 involving 18 dogs with elbow joint dysplasia, CC and flexed ML views had a 46% sensitivity at 100% specificity and a 73% accuracy to detect elbow joint OCD. These studies unfortunately were based on small samples, included a limited number of radiographic views, and did not use assessment methods that would allow evaluation of their diagnostic values regardless of examiner specificity. The purpose of the study reported here was to determine and compare sensitivities and specificities of 5 radiographic views used to assess the presence of abnormalities and OCD lesions of the humeral condyle by use of ROC curve analysis in dogs with pain response to palpation of the elbow joint.9
Area under the curve
Medial aspect of the humeral condyle
Medial coronoid process
Receiver operating characteristic
Hopkins Forward-Oblique Telescope 30°, Storz France, Roissy CDG, France.
SAS, version 9.1.3, SAS Institute Inc, Cary, NC.
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