Snapshot A 35-year-old man presents to the emergency department after sustaining an injury to the knee while playing football. An opposing player's helmet collided with his anterior proximal tibia. After the event, the patient experienced posterior knee pain, mild swelling, and limped off the football field. Physical examination is notable for antalgic gait and a positive posterior drawer test. Preparations are made to obtain a magnetic resonance imaging of the affected knee. Introduction Clinical definition login to view 1 more bullet Associated conditions login to view 4 more bullets Epidemiology Risk factors login to view 2 more bullets Etiology Trauma that posteriorly translates the proximal tibia Pathoanatomy login to view 10 more bullets Presentation Symptoms login to view 2 more bullets Physical exam login to view 6 more bullets Imaging Radiography login to view 2 more bullets Magnetic resonance imaging (MRI) login to view 3 more bullets Studies Making the diagnosis login to view 2 more bullets Differential Anterior cruciate ligament injury login to view 3 more bullets Treatment Conservative login to view 6 more bullets Operative login to view 3 more bullets Complications May result in osteoarthritis Prognosis Insufficient evidence to determine the true prognosis