Which radiographic finding is commonly associated with osteoarthritis in aging dogs?

• A. Thickening of the joint capsule and osteophytic lipping
• B. Joint space widening with osteolysis
• C. Calcified menisci
• D. No radiographic signs

Answer: (A)

Osteoarthritis in aging dogs commonly shows changes at the joint margins on radiographs, particularly osteophyte formation along the edges of the joint. These bone spurs, often accompanied by thickening of the joint capsule from chronic synovitis and fibrosis, are classic and widely observed features of degenerative joint disease. This combination—bone spurs at the joint margins with capsular thickening—best reflects the typical radiographic picture of OA.

Joint space narrowing with osteolysis is less typical for OA and more suggestive of other processes that attack bone and cartilage more aggressively. Calcified menisci can occur in some joints but are not the hallmark finding of OA in dogs. And while early OA can be subtle, there are usually some radiographic signs rather than none.