title: Cyclops lesions are associated with altered gait patterns and medial knee joint cartilage degeneration at 1 year after ACL-reconstruction.
abstract: In this exploratory study, gait analysis and quantitative MRI (QMRI) were used to assess biomechanical differences in patients that present with cyclops lesions at 12 months after ACL-reconstruction (ACLR). Thirty ACLR patients without and 10 ACLR patients with cyclops lesions underwent 3T MR T1ρmapping of the reconstructed knee joint prior to ACLR and at 12 months after ACLR, as well as a gait assessment during a fixed walking speed at 12 months after ACLR. Both external sagittal and frontal plane knee joint moments and joint moment impulses were calculated and assessed throughout the stance phase of gait. ACLR patients with cyclops lesions demonstrated a significantly greater (34% larger, p = 0.03) first peak knee flexion moment (KFM) and KFM impulse (42% larger, p = 0.05), compared to those without cyclops lesions, which may suggest an increased load during the loading response phase of gait. There were no differences (p > 0.05) in knee extension or adduction joint moments or moment impulses. ACLR patients with cyclops lesions demonstrated a significantly increased change in T1ρ(ΔT1ρ= 4.7 ms, p = 0.03), over 12 months, within the central medial tibia. The results of the study suggest that ACLR patients with cyclops lesions demonstrate altered sagittal plane loading patterns which may be related to an increased rate of medial tibiofemoral cartilage degeneration at 12 months after ACLR. The first peak external KFM may be an important target for intervention programs in ACLR patients with cyclops lesions in order to possibly slow the onset or progression of medial tibiofemoral cartilage degeneration. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2275-2281, 2017.
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Samaan
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Luca
authors.initials: L
authors.lastname: Facchetti
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Valentina
authors.initials: V
authors.lastname: Pedoia
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Tanaka
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Link
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.|Department of Physical Therapy and Rehabilitation Science, University of California-San Francisco, California.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Souza
authors.affiliation: Department of Orthopaedic Surgery, University of California-San Francisco, California.
authors.forename: C Benjamin
authors.initials: CB
authors.lastname: Ma
authors.affiliation: Musculoskeletal Quantitative Imaging Research Group, Department of Radiology and Biomedical Imaging, University of California-San Francisco, 185 Berry Street, Lobby 6, Suite 350, San Francisco, California 94107.
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Li
mesh_terms: D000328:Adult; D059549:Anterior Cruciate Ligament Reconstruction / Q000009:adverse effects*; D002358:Cartilage, Articular / Q000473:pathology*; D016022:Case-Control Studies; D005260:Female; D005684:Gait; D006801:Humans; D007719:Knee Joint / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D011183:Postoperative Complications / Q000473:pathology / Q000503:physiopathology*; D055815:Young Adult
keywords: ACL-reconstruction; T1ρ; cartilage degeneration; cyclops lesions; gait