Figure 3. Severity scoring of stifle radiographs for osteophytosis.

(A–D) Severity of osteophytosis was graded as 0 = normal (A), 1 = mild (B), 2 = moderate (C) or 3 = severe (D) respectively after evaluation of orthogonal views of the stifle. Severity scoring was based on the magnitude and severity of osteophyte formation around the joint margins, including the proximal and distal poles of the patella, the lateral and medial aspects of the trochlear ridges of the distal femur, and the lateral, medial, cranial, and caudal aspects of the proximal tibia, and the fabellae. Grading was based on a previously published scale [15].