On this page:
Osteochondral lesions or fractures of the cartilage which sits on top of the Talus (ankle bone), most commonly occur in combination with an ankle sprain.
Symptoms of an Osteochondral lesion of the talus or ankle bone include pain in the ankle with swelling. The ankle may catch or lock and is likely to be stiff. More detailed bone scans, mri or surgery may be required for a full diagnosis.
Osteochondral lesions or fractures of the cartilage which sits on top of the Talus (ankle bone), most commonly occur in combination with an ankle sprain. This is especially common if the injury occurs when landing onto the ankle, as the Tibia above compresses the top of the Talus, damaging the covering cartilage.
Osteochondral fractures in association with a sprain are often not detected initially. The sprain is usually treated and the ankle improves to an extent, but may continue to cause problems such as pain and swelling after activity, at which point further investigations may be made. Large fractures may be evident on X-rays. MRI scans, isotopic bone scans and CT scans are more likely to pick up smaller lesions.
Osteochondral lesions can be graded 1-5, with 1 being the least severe:
I - Subchondral fracture.
II - Chondral fracture.
II a - Subchondral cyst.
III - Chondral fracture with separate but not displaced fragments.
IV - Chondral fracture with separate and displaced fragments.