BMJ Case Reports 2017; doi:10.1136/bcr-2017-222914
  • Images in…

Double PCL sign on sagittal MRI of the knee

  1. Niall Hogan
  1. Department of Orthopaedics, St. James’s Hospital, Dublin, Ireland
  1. Correspondence to Dr Omar Hadidi, hadidio{at}
  • Accepted 30 September 2017
  • Published 10 October 2017


A 24-year-old male presented with left knee pain and swelling after a fall six weeks earlier playing football. Clinical examination revealed an antalgic gait and a moderate left knee effusion with tenderness along the medial joint line. Anterior drawer and Lachman tests were positive, suggesting an anterior cruciate ligament (ACL) injury. An MRI scan performed shortly after the injury revealed a large joint effusion and significant acute bone oedema involving the medial tibial condyle. While the posterior cruciate ligament (PCL) was intact, the ACL was elongated and suspicious for an intrasubstance tear. …

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