Abnormal talus morphology Osteochondral lesion of talus 2025-08-12T07:34:50Z Osteochondral lesion of the talus (OLT) is an injury involving the articular cartilage and subchondral bone, defined as any damage involving both articular cartilage and subchondral bone of the talar dome. OLT can cause ankle joint pain and can sometimes lead to instability and manifest as an area of abnormal, damaged cartilage and bone on the top of the talus bone (the lower bone of the ankle joint).