Knee extension and flexion: MR delineation of normal and torn anterior cruciate ligaments

Journal of Computer Assisted Tomography
M NiitsuY Itai

Abstract

Our goal was to assess the effect of joint position of semiflexed and extended knees in MR delineation of the anterior cruciate ligament (ACL). With a mobile knee brace and a flexible surface coil, the knee joint was either fully extended or bent to a semiflexed position (average 45 degrees of flexion) within the magnet bore. Sets of oblique sagittal MR images were obtained for both extended and flexed knee positions. Thirty-two knees with intact ACLs and 43 knees with arthroscopically proven ACL tears were evaluated. Two observers compared paired MR images of both extended and flexed positions and rated them by a relative three point scale. Anatomic correlation in MR images was obtained by a cadaveric knee with incremental flexion. The MR images of flexed knees were more useful than of extended knees in 53% of the case reviews of femoral attachments and 36% of reviews of midportions of normal ACLs. Compared with knee extensions, the MR images for knee flexion provided better clarity in 48% of reviews of disrupted sites and 52% of residual bundles of torn ACLs. Normal ACL appeared taut in the knee extension and lax in semiflexion. Compared with MR images of knees in extension, MR images of knees in flexion more clearly delineat...Continue Reading

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Citations

Jun 7, 2011·Skeletal Radiology·Alex Wing Hung NgKai Ming Chan
Oct 3, 2003·Clinical Radiology·M Niitsu, K Ikeda
Jul 24, 2002·Clinical Biomechanics·Per WretenbergGunnar Németh
Dec 20, 2003·Magnetic Resonance Imaging·Wingchi E KwokSaara M S Totterman
Apr 7, 2007·Topics in Magnetic Resonance Imaging : TMRI·Kathryn J Stevens, Jason L Dragoo
Mar 2, 2013·Radiology and Oncology·Dragoslav Nenezic, Igor Kocijancic
Jan 24, 2014·Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association·Juan PodaderaMariano Makara
Oct 9, 2002·Clinics in Sports Medicine·Dariusz Witonski
Aug 16, 2016·Surgical and Radiologic Anatomy : SRA·Daphne GuenounPierre Champsaur
Jun 3, 2017·The Journal of the American Academy of Orthopaedic Surgeons·Mohamed Hussein
Dec 13, 2018·Surgical and Radiologic Anatomy : SRA·Yoshihiro AkatsukaToshihiko Yamashita
Sep 23, 2003·Journal of Computer Assisted Tomography·Sung Hwan HongHeung Sik Kang
Aug 12, 2000·Seminars in Roentgenology·A StorkH K Genant

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