SplintER Series: Don’t forget about the (tibial) spine!
A 13-year-old patient presents to the Emergency Department after sustaining a twisting knee injury while playing soccer. There was a pop, and the patient was subsequently unable to bear weight due to pain and knee instability. The swelling and pain increased in the hours after the injury occurred. On examination, there is a large knee effusion and a positive Lachman test. You obtain imaging (Figure 1). What is your suspected diagnosis? What is your initial workup in the ED? What imaging confirms the diagnosis? What is your management and disposition?
Figure 1: AP and lateral radiographs of the left knee. Case courtesy Dr. Jeremy Jones, Radiopaedia.org, rID: 27372
A 67-year-old male with a history of bilateral total hip arthroplasties (THA) several years ago presents with left hip pain after a fall. He was walking downstairs and slipped, twisting his leg internally and with adduction and flexion of the hip to catch himself. He denies falling but felt an immediate pop in his left hip and could no longer bear weight. AP and lateral radiographs of the pelvis and left hip were obtained and are shown above (Image 1. Case courtesy of Dr Andrew Taylor, Radiopaedia.org, rID: 
