Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

576 Small Animal Radiolo g y and Ultrasono graphy
Fig. 4-128 A 6-year-old female
Labrador Retriever was brought in
for acute right forelimb lameness and
elbow pain. A and B, Radiographic
findings include fragmented medial
coronoid process (arrow) with secondary
degenerative joint disease
and an extraarticular mineralized
body associated with the medial
humeral epicondyle (arrowhead).
Diagnosis: Chronic fragmented and
ununited medial humeral epicondyle
and chronic fragmented medial coronoid
process.
A
B
humerus (Fig. 4-128) gives rise to massive enthesiophytes and periarticular mineralization
around the medial aspect of the elbow.
Patellar Luxation. Medial patellar luxation is a congenital lesion seen most frequently
in miniature and small-breed dogs and rarely in cats. 582-588 The medial patella displacement
is recognized easily; however, when the limb is extended during positioning for radiographs,
the patella may resume a normal position. Varying degrees of severity may be
observed (Fig. 4-129). The distal femur and proximal tibia may present an S-shaped (sig-