These left knee x-rays are from a 20 year old who has twisted his knee and is complaining of knee pain and swelling. What 3 abnormal features can you note on the image provided?
The 3 abnormal features on the knee x-ray are:
1. Segond fracture: there is a small curvilinear bone fragment lying lateral to the lateral tibial plateau.
2. Compression injury to the lateral femoral condyle on the lateral x-ray
3. Knee effusion
Segond fracture is a fracture associated with an internal derangement of the knee. A small bony fragment is pulled off the posterior lateral tibial joint line by an avulsion of the lateral joint capsule; this is almost always associated with an ACL tear. The presence of a compression injury to the lateral femoral condyle is also commonly seen with an ACL tear.
This patient should have his knee immobilised in a splint and referred to an orthopaedic specialist.
Reference: Fundamentals of Diagnostic Radiology by Brant and Helms, 4th edition[/peekaboo_content]