Fibular Head Dislocation: An Uncommon Cause of Knee Pain

The patient is a male in his 20s who was playing soccer and felt a pop in his left knee followed by pain in his left knee. He has not been able to ambulate since the injury. He has an obvious deformity to the lateral aspect of his left knee. His x-ray was read as normal. Given his pain and mechanism, there was concern for fibular head dislocation so a CT of the knee was ordered. This showed an anterior, inferior subluxation of the fibular head.