caa a22 4500 605458456 CHVBK 20210128100229.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00167-015-3738-x doi (NATIONALLICENCE)springer-10.1007/s00167-015-3738-x MRI injury patterns in surgically confirmed and reconstructed posterolateral corner knee injuries [Elektronische Daten] [Mark Collins, Jeffery Bond, Andrew Crush, Michael Stuart, Alexander King, Bruce Levy] Purpose: The posterolateral corner (PLC) of the knee is anatomically complex with similarly complex MR imaging findings in acutely injured knees. The purpose of this study was to define the MRI pattern of injury in cases of PLC disruption requiring surgery because of clinical instability. Methods: The knee MRIs of 22 patients who underwent surgical repair and/or reconstruction of PLC injury were retrospectively reviewed. The fibular collateral ligament (FCL), popliteus tendon (PT), biceps femoris (BF), popliteofibular ligament (PFL), arcuate ligament (AL), and fabellofibular ligament (FFL) were evaluated and graded as follows: complete tear, high-grade partial tear, low-grade partial tear, and normal. Results: In the 22 cases of PLC injury that necessitated surgery, a constellation of findings involving the larger structures of the PLC was identified. Of the FCL, PT, and BF (considered larger structures), at least two were abnormal in all 22 injury cases. Of the PFL, AL, and FFL (considered smaller structures), the PFL appeared abnormal in 19 cases, yet neither the AL nor FFL were confidently characterized in the injury group. Conclusion: The larger structures of the PLC are easily evaluated using standard MRI techniques. This study identified a predictable pattern of imaging findings involving these more easily assessed structures in those patients who were felt to be clinically unstable and underwent surgical reconstruction, as at least two were abnormal in all 22 cases. The smaller structures of the PLC are difficult to assess with MRI; however, direct visualization of their involvement on MRI is not necessary to report a clinically unstable PLC injury. Emphasis of this simplified but critical analysis of the FCL, BF and PT on MRI scans reviewed by radiologists and orthopaedic surgeons may help to prevent delayed diagnosis of unstable PLC injuries. Level of evidence: III. European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA), 2015 Posterolateral corner injury nationallicence MRI nationallicence Instability nationallicence Collins Mark Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Bond Jeffery Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Crush Andrew Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Stuart Michael Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut King Alexander Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Levy Bruce Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/10(2015-10-01), 2943-2949 0942-2056 23:10<2943 2015 23 167 https://doi.org/10.1007/s00167-015-3738-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-015-3738-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Collins Mark Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Bond Jeffery Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Crush Andrew Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Stuart Michael Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- King Alexander Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Levy Bruce Department of Orthopedic Surgery and Radiology, Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/10(2015-10-01), 2943-2949 0942-2056 23:10<2943 2015 23 167