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Knee MR image

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https://www.readbyqxmd.com/read/28647841/anterior-cruciate-ligament-tibial-insertion-site-is-elliptical-or-triangular-shaped-in-healthy-young-adults-high-resolution-3-t-mri-analysis
#1
Yasutaka Tashiro, Gian Andrea Lucidi, Tom Gale, Kanto Nagai, Elmar Herbst, James J Irrgang, Yasuharu Nakashima, William Anderst, Freddie H Fu
PURPOSE: To clarify the morphology of anterior cruciate ligament (ACL) tibial insertion site in healthy young knees using high-resolution 3-T MRI. METHODS: Subjects were 50 ACL-reconstructed patients with a mean age of 21.4 ± 6.8 years. The contralateral healthy knees were scanned using high-resolution 3-T MRI. The tibial insertion sites of the anteromedial (AM) and posterolateral (PL) bundle fibres, and the ACL attachment on the anterior horn of lateral meniscus (AHLM) were segmented from the MR images, and 3D models were reconstructed to evaluate the morphology...
June 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28618873/magnetic-resonance-imaging-score-and-classification-system-amadeus-for-assessment-of-preoperative-cartilage-defect-severity
#2
Pia M Jungmann, Götz H Welsch, Mats Brittberg, Siegfried Trattnig, Sepp Braun, Andreas B Imhoff, Gian M Salzmann
Objective To design a simple magnetic resonance (MR)-based assessment system for quantification of osteochondral defect severity prior to cartilage repair surgery at the knee. Design The new scoring tool was supposed to include 3 different parameters: (1) cartilage defect size, (2) depth/morphology of the cartilage defect, and (3) subchondral bone quality, resulting in a specific 3-digit code. A clearly defined numeric score was developed, resulting in a final score of 0 to 100. Defect severity grades I through IV were defined...
July 2017: Cartilage
https://www.readbyqxmd.com/read/28604062/cartilage-regeneration-in-full-thickness-patellar-chondral-defects-treated-with-particulated-juvenile-articular-allograft-cartilage-an-mri-analysis
#3
Brian Grawe, Alissa Burge, Joseph Nguyen, Sabrina Strickland, Russell Warren, Scott Rodeo, Beth ShubinStein
Background Full-thickness cartilage lesions of the patella represent a common source of pain and dysfunction. Previously reported surgical treatment options include marrow stimulation, cell-based treatments, and osteochondral transfer. Minced juvenile allograft cartilage is a novel treatment option that allows for a single stage approach for these lesions. Hypothesis Particulated juvenile allograft cartilage (PJAC) for the treatment of chondral defects of the patella would offer acceptable lesion fill rates, mature over time, and not be associated with any negative biologic effects on the surrounding tissue...
June 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28596576/knee-subchondral-bone-perfusion-and-its-relationship-to-marrow-fat-and-trabeculation-on-multi-parametric-mri-and-micro-ct-in-experimental-ckd
#4
Chao-Ying Wang, Yu-Juei Hsu, Yi-Jen Peng, Herng-Sheng Lee, Yue-Cune Chang, Chih-Shan Chang, Shih-Wei Chiang, Yi-Chih Hsu, Ming-Huang Lin, Guo-Shu Huang
The pathogenesis of chronic kidney disease (CKD) is multifactorial. In the progression of CKD arthropathy, arteriosclerosis may alter the knee subchondral bone marrow by altering blood flow through the bone vasculature. Herein, multi-parametric MRI assessment, including dynamic contrast enhanced magnetic resonance imaging (DCE-MRI), magnetic resonance spectroscopy (MRS), MRI T2*, contrast enhanced MR angiography (CE-MRA), and micro-CT were applied in a rodent nephrectomy model to: 1) investigate the blood perfusion of subchondral bone marrow and its relationship to fat water content and trabeculation pattern in CKD and 2) demonstrate the feasibility of using multi-parametric MRI parameters as imaging biomarkers to evaluate the disease's progression...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28580842/understanding-magnetic-resonance-imaging-of-knee-cartilage-repair-a-focus-on-clinical-relevance
#5
Daichi Hayashi, Xinning Li, Akira M Murakami, Frank W Roemer, Siegfried Trattnig, Ali Guermazi
The aims of this review article are (a) to describe the principles of morphologic and compositional magnetic resonance imaging (MRI) techniques relevant for the imaging of knee cartilage repair surgery and their application to longitudinal studies and (b) to illustrate the clinical relevance of pre- and postsurgical MRI with correlation to intraoperative images. First, MRI sequences that can be applied for imaging of cartilage repair tissue in the knee are described, focusing on comparison of 2D and 3D fast spin echo and gradient recalled echo sequences...
June 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28565811/severity-and-distribution-of-cartilage-damage-and-bone-marrow-edema-in-the-patellofemoral-and-tibiofemoral-joints-in-knee-osteoarthritis-determined-by-mri
#6
Baoming Dong, Yanliang Kong, Lei Zhang, Yongqian Qiang
The aim of the present study was to analyze the distribution and severity of cartilage damage (CD) and bone marrow edema (BME) of the patellofemoral and tibiofemoral joints (PFJ and TFJ, respectively) in patients with knee osteoarthritis (OA), and to determine whether a correlation exists between BME and CD in knee OA, using magnetic resonance imaging (MRI). Forty-five patients diagnosed with knee OA (KOA group) and 20 healthy individuals (control group) underwent sagittal multi-echo recalled gradient echo sequence scans, in addition to four conventional MR sequence scans...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28561955/biexponential-t2-relaxation-estimation-of-human-knee-cartilage-in-vivo-at-3t
#7
Azadeh Sharafi, Gregory Chang, Ravinder R Regatte
PURPOSE: To evaluate biexponential T2 relaxation mapping of human knee cartilage in vivo in clinically feasible scan times. MATERIALS AND METHODS: T2 -weighted magnetic resonance (MR) images were acquired from eight healthy volunteers using a standard 3T clinical scanner. A 3D Turbo-Flash sequence was modified to enable T2 -weighted imaging with different echo times. Series of T2 -weighted images were fitted using mono- and biexponential models with two- and four-parametric nonlinear approaches, respectively...
May 31, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28556419/association-of-diabetes-mellitus-and-biochemical-knee-cartilage-composition-assessed-by-t2-relaxation-time-measurements-data-from-the-osteoarthritis-initiative
#8
Nattagan Chanchek, Alexandra S Gersing, Benedikt J Schwaiger, Michael C Nevitt, Jan Neumann, Gabby B Joseph, Nancy E Lane, Julia Zarnowski, Felix C Hofmann, Ursula Heilmeier, Charles E McCulloch, Thomas M Link
PURPOSE: To investigate the association of the presence and severity of diabetes mellitus (DM) with articular cartilage composition, using magnetic resonance imaging (MRI)-based T2 relaxation time measurements, and structural knee abnormalities. MATERIALS AND METHODS: In the Osteoarthritis Initiative 208, participants with DM (age 63.0 ± 8.9 years; 111 females) and risk factors for osteoarthritis (OA) or mild radiographic tibiofemoral OA (Kellgren-Lawrence [KL] grade ≤2) were identified and group-matched with 208 controls without DM (age 63...
May 26, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28536729/clinics-in-diagnostic-imaging-177-medical-meniscus-bucket-handle-tear-with-medial-oblique-meniscomeniscal-ligament
#9
Poh Lye Paul See
A 29-year-old man with a previous football injury to his left knee presented with pain of the same knee. The patient twisted it as he was turning a corner quickly while going up the stairs, leading to internal rotation of his femur on his tibia with his knee in flexion. MR imaging revealed a bucket-handle tear of the medial meniscus, as well as a complete tear of the anterior cruciate ligament. However, image interpretation was complicated by the presence of a medial oblique meniscomeniscal ligament, a rare normal variant among intermeniscal ligaments of the knee...
May 2017: Singapore Medical Journal
https://www.readbyqxmd.com/read/28521823/t1rho-and-t2-relaxation-times-of-the-normal-adult-knee-meniscus-at-3t-analysis-of-zonal-differences
#10
Shoichiro Takao, Tan B Nguyen, Hon J Yu, Shigeo Hagiwara, Yasuhito Kaneko, Taiki Nozaki, Seiji Iwamoto, Maki Otomo, Ran Schwarzkopf, Hiroshi Yoshioka
BACKGROUND: Prior studies describe histological and immunohistochemical differences in collagen and proteoglycan content in different meniscal zones. The aim of this study is to evaluate horizontal and vertical zonal differentiation of T1rho and T2 relaxation times of the entire meniscus from volunteers without symptom and imaging abnormality. METHODS: Twenty volunteers age between 19 and 38 who have no knee-related clinical symptoms, and no history of prior knee surgeries were enrolled in this study...
May 18, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28512063/influence-of-delayed-gadolinium-enhanced-mri-of-cartilage-dgemric-protocol-on-t2-mapping-is-it-possible-to-comprehensively-assess-knee-cartilage-composition-in-one-post-contrast-mr-examination-at-3-tesla
#11
J Verschueren, J van Tiel, M Reijman, E E Bron, S Klein, J A N Verhaar, S M A Bierma-Zeinstra, G P Krestin, P A Wielopolski, E H G Oei
OBJECTIVE: To evaluate the possibility of assessing knee cartilage with T2-mapping and delayed gadolinium enhanced magnetic resonance imaging (MRI) of cartilage (dGEMRIC) in one post-contrast MR examination at 3 Tesla (T). DESIGN: T2 mapping was performed in 10 healthy volunteers at baseline; directly after baseline; after 10 min of cycling; and after 90 min delay, and in 16 osteoarthritis patients before and after intravenous administration of a double dose gadolinium dimeglumine contrast agent, reflecting key dGEMRIC protocol elements...
May 13, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28491187/giant-cell-tumor-of-the-tendon-seath-of-the-tendinous-insertion-in-pes-anserinus
#12
Aikaterini Solomou, Pantelis Kraniotis
A 56-year-old woman with a palpable lump in the medial surface of her left knee was referred for diagnostic workup with magnetic resonance imaging. The lesion was pathogically confirmed to be a giant cell tumor of the tendon seath. The MR features of the lesion are presented.
June 2017: Radiology case reports
https://www.readbyqxmd.com/read/28489309/isotropic-three-dimensional-t2-mapping-of-knee-cartilage-development-and-validation
#13
Roberto Colotti, Patrick Omoumi, Gabriele Bonanno, Jean-Baptiste Ledoux, Ruud B van Heeswijk
PURPOSE: 1) To implement a higher-resolution isotropic 3D T2 mapping technique that uses sequential T2 -prepared segmented gradient-recalled echo (Iso3DGRE) images for knee cartilage evaluation, and 2) to validate it both in vitro and in vivo in healthy volunteers and patients with knee osteoarthritis. MATERIALS AND METHODS: The Iso3DGRE sequence with an isotropic 0.6 mm spatial resolution was developed on a clinical 3T MR scanner. Numerical simulations were performed to optimize the pulse sequence parameters...
May 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28484790/lateral-meniscus-posterior-root-tear-contributes-to-anterolateral-rotational-instability-and-meniscus-extrusion-in-anterior-cruciate-ligament-injured-patients
#14
Takao Minami, Takeshi Muneta, Ichiro Sekiya, Toshifumi Watanabe, Tomoyuki Mochizuki, Masafumi Horie, Hiroki Katagiri, Koji Otabe, Toshiyuki Ohara, Mai Katakura, Hideyuki Koga
PURPOSE: The purposes of this study were to investigate (1) meniscus status and clinical findings in anterior cruciate ligament (ACL)-injured patients to clarify associations between the meniscus posterior root tear (PRT) and knee instability, and (2) magnetic resonance imaging (MRI) findings of the PRT to clarify sensitivity and specificity of MRI and prevalence of meniscus extrusion. METHODS: Three hundred and seventeen patients with primary ACL reconstruction were included...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28473964/t1%C3%AF-t2-mapping-and-histopathology-of-degenerative-cartilage-in-advanced-knee-osteoarthritis
#15
Benjamin S Kester, Philip M Carpenter, Hon J Yu, Taiki Nozaki, Yasuhito Kaneko, Hiroshi Yoshioka, Ran Schwarzkopf
AIM: To investigate whether normal thickness cartilage in osteoarthritic knees demonstrate depletion of proteoglycan or collagen content compared to healthy knees. METHODS: Magnetic resonance (MR) images were acquired from 5 subjects scheduled for total knee arthroplasty (TKA) (mean age 70 years) and 20 young healthy control subjects without knee pain (mean age 28.9 years). MR images of T1ρ mapping, T2 mapping, and fat suppressed proton-density weighted sequences were obtained...
April 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28463057/is-weight-loss-associated-with-less-progression-of-changes-in-knee-articular-cartilage-among-obese-and-overweight-patients-as-assessed-with-mr-imaging-over-48-months-data-from-the-osteoarthritis-initiative
#16
Alexandra S Gersing, Benedikt J Schwaiger, Michael C Nevitt, Gabby B Joseph, Nattagan Chanchek, Julio B Guimaraes, John Mbapte Wamba, Luca Facchetti, Charles E McCulloch, Thomas M Link
Purpose To investigate the association of weight loss with progression of cartilage changes at magnetic resonance (MR) imaging over 48 months in overweight and obese participants compared with participants of stable weight. Materials and Methods The institutional review boards of the four participating centers approved this HIPAA-compliant study. Included were (a) 640 participants (mean age, 62.9 years ± 9.1 [standard deviation]; 398 women) who were overweight or obese (body mass index cutpoints of 25 and 30 kg/m(2), respectively) from the Osteoarthritis Initiative, with risk factors for osteoarthritis or mild to moderate radiographic findings of osteoarthritis, categorized into groups with (a) weight loss of more than 10% (n = 82), (b) weight loss of 5%-10% (n = 238), or (c) stable weight (n = 320) over 48 months...
May 2, 2017: Radiology
https://www.readbyqxmd.com/read/28456927/associations-of-three-dimensional-t1-rho-mr-mapping-and-three-dimensional-t2-mapping-with-macroscopic-and-histologic-grading-as-a-biomarker-for-early-articular-degeneration-of-knee-cartilage
#17
T Sasho, J Katsuragi, S Yamaguchi, H Haneishi, T Aizimu, T Tanaka, A Watanabe, Y Sato, R Akagi, K Matsumoto, T Uno, K Motoori
T1 rho and T2 mapping are magnetic resonance imaging (MRI) techniques to detect early degenerative changes in cartilage. Recent advancements have enabled 3D acquisition for both techniques. The objective of the present study was to examine the correlation of 3D T1 rho and 3D T2 mapping with macroscopic and histological characteristics of knee cartilage. Twenty-one patients who underwent total knee arthroplasty due to osteoarthritis with involvement of the medial compartment but with minimum involvement of the lateral compartment were enrolled...
April 29, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28451863/variations-in-knee-kinematics-after-acl-injury-and-after-reconstruction-are-correlated-with-bone-shape-differences
#18
Drew A Lansdown, Valentina Pedoia, Musa Zaid, Keiko Amano, Richard B Souza, Xiaojuan Li, C Benjamin Ma
BACKGROUND: The factors that contribute to the abnormal knee kinematics after anterior cruciate ligament (ACL) injury and ACL reconstruction remain unclear. Bone shape has been implicated in the development of hip and knee osteoarthritis, although there is little knowledge about the effects of bone shape on knee kinematics after ACL injury and after ACL reconstruction. QUESTIONS/QUESTIONS: (1) What is the relationship between bony morphology with alterations in knee kinematics after ACL injury? (2) Are baseline bone shape features related to abnormal knee kinematics at 12 months after ACL reconstruction? METHODS: Thirty-eight patients (29 ± 8 years, 21 men) were prospectively followed after acute ACL injury and before ligamentous reconstruction...
April 27, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28432403/bone-marrow-fat-content-in-70-adolescent-girls-with-anorexia-nervosa-magnetic-resonance-imaging-and-magnetic-resonance-spectroscopy-assessment
#19
Kirsten Ecklund, Sridhar Vajapeyam, Robert V Mulkern, Henry A Feldman, Jennifer M O'Donnell, Amy D DiVasta, Catherine M Gordon
BACKGROUND: Adolescents and women with anorexia nervosa have increased bone marrow fat and decreased bone formation, at least in part due to hormonal changes leading to preferential stem cell differentiation to adipocytes over osteoblasts. OBJECTIVE: The purpose of this study was to evaluate marrow fat content and correlate with age and disease severity using knee MRI with T1 relaxometry (T1-R) and MR spectroscopy (MRS) in 70 adolescents with anorexia nervosa. MATERIALS AND METHODS: We enrolled 70 girls with anorexia nervosa who underwent 3-T knee MRI with coronal T1-W images, T1-R and single-voxel proton MRS at 30 and 60 ms TE...
April 22, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28430716/simultaneous-multislice-accelerated-turbo-spin-echo-magnetic-resonance-imaging-comparison-and-combination-with-in-plane-parallel-imaging-acceleration-for-high-resolution-magnetic-resonance-imaging-of-the-knee
#20
Jan Fritz, Benjamin Fritz, Jialu Zhang, Gaurav K Thawait, Dharmdev H Joshi, Li Pan, Dingxin Wang
PURPOSE: We prospectively quantified the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of integrated parallel acquisition technique (PAT) and simultaneous multislice (SMS) acceleration and various combinations thereof, and we further compared two 4-fold-accelerated (PAT2-SMS2) high-resolution turbo spin echo (TSE) magnetic resonance imaging (MRI) protocols of the knee against a clinical 2-fold-accelerated (PAT2-SMS1) TSE standard. MATERIALS AND METHODS: Institutional review board approval was obtained, and all subjects gave informed consent...
April 20, 2017: Investigative Radiology
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