Diagnostic Value of CT Arthrography for Evaluation of Osteochondral Lesions at the Ankle

Figure 1

CTA for detection of full thickness cartilage lesions at the ankle in the presence of subchondral cysts. On MRI presence of full thickness cartilage defects remain unclear. In case (a) CTA demonstrates incongruence of the cartilage surface but no full thickness defect. In case (b) CTA demonstrated a fissural full thickness cartilage defect, allowing communication between intra-articular synovial fluid and subchondral cyst.

(a)

(b)