4 UT Southwestern Medical Center, Department of Orthopaedic Surgery, 5323 Harry Hines Blvd, Dallas, TX 75390; UT Southwestern Medical Center, Department of Radiology, 5323 Harry Hines Blvd, Dallas, TX 75390; Adjunct Faculty Johns Hopkins University, Department of Radiology, Maryland, USA; Department of Radiology, Walton Center of Neurosciences, Liverpool, UK. Electronic address: avneesh.chhabra@utsouthwestern.edu.