chondral fracture

Description: Clinical presentation: 27 year old male with pain and swelling of the left knee after falling and hitting his knee.
The lateral view shows distension of the supra-patellar burse from a joint effusion, but no obvious fracture. On closer inspection, a short, fine linear density is seen in the AP. view. This is projected at a 45 degree angle, over the tibial spines.
Osteochondral fracture involving the anterior tibial spine - insertion of the ACL