Figure 2. Severity scoring of stifle radiographs for synovial effusion.

(A–C) Severity of synovial effusion was graded as 0 = normal (A), 1 = mild (B), or 2 = severe (C), using the medial-lateral radiographic view. Severity scoring was based on the magnitude of the soft tissue density within the stifle joint and the dimensions of the intra-patellar fat pad density in the cranial part of the joint. Grading was based on a previously published scale [15].