Most common spot to get OCD lesion is anterolateral (front outside) and posteromedial (back inside) part of talus (main ankle bone).
What is Osteochondritis Dissecans?
- An injury to the articular cartilage that covers the bone and/or the underlying bone (think of the chocolate layer of a chocolate covered pretzel).
- If the bone is involved, avascular necrosis can occur.
- Avascular necrosis occurs when there is a lack of blood flow and tiny breaks in the bone occur.
- These tiny breaks can eventually lead to bone collapse.
- If the articular cartilage is still intact, a growth of fibrous tissue will occur between the bone and cartilage.
- If the fragment is not displaced, healing takes place.
- If it is displaced, there will be severe pain, catching, and lack of stability.
How Does it Happen?
One is most likely to get OCD lesion when talocrural (ankle) joint undergoes a torsional stress through impact or repetitive loading.
- Swelling and tenderness
- Joint popping or locking
- Joint weakening – feel like ankle is giving out
- Limited range of motion