Anatomy of the Knee X-ray - AP projection. It’s important to be able to identify the normal structures not only to identify the abnormality but to describe it as well! A systematic review involves multiple views but I typically use the AP view to look at these. 1. Tibio-femoral alignment - draw a line from the lateral margin of the femur drawn straight below. If the tibia is observed more than 5mm beyond it, think of a fracture of the tibial plateau. 2. Plateaus - common site for several types of fractures including Avulsion of the tibial spine or of the plateau (Segond/reverse segond)! 3. Calcification - especially around the medial epicondyle called Pellegrini- Steida lesion. 4. Joint Space - Check for asymmetry between medial and lateral compartments and be wary of positioning errors! To asses the patella or to look for effusion/hemarthrosis, I typically use a lateral view as it provides more information! Dr. Devpriyo Pal @drdevrad #knee #xray #clinical #radiology #anatomy #ap #radiology #msk #orthopedics #labeled
