Teaching Point or Hint:
The punctate radiopaque (white) things are bomb fragments.
AP radiograph of the right knee shows cortical irregularity at the superior aspect of the medial femoral condyle, and lateral aspect of the lateral femoral condyle. The patient is post BKA, with prior surgical changes noted in the proximal tibia and diffuse osteopenia. Heterotopic ossification and shrapnel (arrows) are seen in the soft tissues.