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https://www.readbyqxmd.com/read/28801826/brain-activity-changes-in-somatosensory-and-emotion-related-areas-with-medial-patellofemoral-ligament-deficiency
#1
Masaru Kadowaki, Taku Tadenuma, Nobuyuki Kumahashi, Yuji Uchio
BACKGROUND: Patellar instability with medial patellofemoral ligament (MPFL) deficiency is a common sports injury among young people. Although nonoperative and surgical treatment can provide stability of the patella, patients often have anxiety related to the knee. We speculate that neural dysfunction may be related to anxiety in these patients; however, the mechanism in the brain that generates this anxiety remains unknown. QUESTIONS/PURPOSES: (1) How does brain activity in patients with MPFL deficiency change in the areas related to somatic sensation against lateral shift of the patella? (2) How does patella instability, which can lead to continuous fear or apprehension for dislocation, influence brain activity in the areas related to emotion? METHODS: Nineteen patients with MPFL deficiency underwent surgical reconstruction in our hospital from April 2012 to March 2014...
August 11, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28777663/frondlike-synovitis-on-mri-and-correlation-with-polyethylene-surface-damage-of-total-knee-arthroplasty
#2
Angela E Li, Christine C Johnson, Darryl B Sneag, Chelsea N Koch, Kara Fields, Theodore T Miller, Timothy M Wright, Douglas E Padgett, Hollis G Potter
OBJECTIVE: The purpose of this study is to determine the association between polyethylene surface damage and the severity of frondlike hypertrophied synovitis, joint distention, capsular thickness, and osteolysis on MRI compared with other patient factors. Another goal of this study is to ascertain the interobserver reliability in MRI evaluation of synovitis. MATERIALS AND METHODS: MR images of 61 patients who had undergone revision total knee arthroplasty (TKA) were retrospectively reviewed...
August 4, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28756566/pten-hamartoma-of-the-soft-tissue-the-initial-manifestation-of-an-underlying-pten-hamartoma-tumor-syndrome-in-a-4-year-old-female
#3
Charles B Chism, Lindsay Crawford, Amanda Tchakarov, Alyaa Al-Ibraheemi, Nicholas M Beckmann
A 4-year-old female was referred to pediatric orthopedic surgery for left leg pain and limping for 3 months following a motor vehicle collision. Recently, the patient's mother had noted left knee swelling and dragging of the left leg when walking. Past medical history was significant for hip dysplasia with slight leg length discrepancy. The patient was otherwise healthy. Physical examination was remarkable for left pre-patellar soft tissue fullness with normal range of motion. There was no warmth or tenderness...
July 29, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28733975/deep-convolutional-neural-network-and-3d-deformable-approach-for-tissue-segmentation-in-musculoskeletal-magnetic-resonance-imaging
#4
Fang Liu, Zhaoye Zhou, Hyungseok Jang, Alexey Samsonov, Gengyan Zhao, Richard Kijowski
PURPOSE: To describe and evaluate a new fully automated musculoskeletal tissue segmentation method using deep convolutional neural network (CNN) and three-dimensional (3D) simplex deformable modeling to improve the accuracy and efficiency of cartilage and bone segmentation within the knee joint. METHODS: A fully automated segmentation pipeline was built by combining a semantic segmentation CNN and 3D simplex deformable modeling. A CNN technique called SegNet was applied as the core of the segmentation method to perform high resolution pixel-wise multi-class tissue classification...
July 21, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28716681/mri-magic-angle-effect-in-femorotibial-cartilages-of-the-red-kangaroo
#5
Tonima S Ali, Namal Thibbotuwawa, YuanTong Gu, Konstantin I Momot
OBJECTIVE: Kangaroo knee cartilages are robust tissues that can support knee flexion and endure high levels of compressive stress. This study aimed to develop a detailed understanding of the collagen architecture in kangaroo knee cartilages and thus obtain insights into the biophysical basis of their function. DESIGN: Cylindrical/square plugs from femoral and tibial hyaline cartilage and tibial fibrocartilage were excised from the knees of three adult red kangaroos...
July 15, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28711767/fully-automated-subchondral-bone-segmentation-from-knee-mr-images-data-from-the-osteoarthritis-initiative
#6
Akash Gandhamal, Sanjay Talbar, Suhas Gajre, Ruslan Razak, Ahmad Fadzil M Hani, Dileep Kumar
Knee osteoarthritis (OA) progression can be monitored by measuring changes in the subchondral bone structure such as area and shape from MR images as an imaging biomarker. However, measurements of these minute changes are highly dependent on the accurate segmentation of bone tissue from MR images and it is challenging task due to the complex tissue structure and inadequate image contrast/brightness. In this paper, a fully automated method for segmenting subchondral bone from knee MR images is proposed. Here, the contrast of knee MR images is enhanced using a gray-level S-curve transformation followed by automatic seed point detection using a three-dimensional multi-edge overlapping technique...
July 8, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28710543/acute-non-contact-anterior-cruciate-ligament-tears-are-associated-with-relatively-increased-vastus-medialis-to-semimembranosus-cross-sectional-area-ratio-a-case-control-retrospective-mr-study
#7
Ged G Wieschhoff, Jacob C Mandell, Gregory J Czuczman, Violeta Nikac, Nehal Shah, Stacy E Smith
OBJECTIVE: Hamstring muscle deficiency is increasingly recognized as a risk factor for anterior cruciate ligament (ACL) tears. The purpose of this study is to evaluate the vastus medialis to semimembranosus cross-sectional area (VM:SM CSA) ratio on magnetic resonance imaging (MRI) in patients with ACL tears compared to controls. MATERIALS AND METHODS: One hundred knee MRIs of acute ACL tear patients and 100 age-, sex-, and side-matched controls were included. Mechanism of injury, contact versus non-contact, was determined for each ACL tear subject...
July 15, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28685238/functional-in-situ-assessment-of-human-articular-cartilage-using-mri-a-whole-knee-joint-loading-device
#8
Sven Nebelung, Manuel Post, Stefan Raith, Horst Fischer, Matthias Knobe, Benedikt Braun, Andreas Prescher, Markus Tingart, Johannes Thüring, Philipp Bruners, Holger Jahr, Christiane Kuhl, Daniel Truhn
The response to loading of human articular cartilage as assessed by magnetic resonance imaging (MRI) remains to be defined in relation to histology and biomechanics. Therefore, an MRI-compatible whole-knee joint loading device for the functional in situ assessment of cartilage was developed and validated in this study. A formalin-fixed human knee was scanned by computed tomography in its native configuration and digitally processed to create femoral and tibial bone models. The bone models were covered by artificial femoral and tibial articular cartilage layers in their native configuration using cartilage-mimicking polyvinyl siloxane...
July 6, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28677057/forensic-age-estimation-by-magnetic-resonance-imaging-of-the-knee-the-definite-relevance-in-bony-fusion-of-the-distal-femoral-and-the-proximal-tibial-epiphyses-using-closest-to-bone-t1-tse-sequence
#9
Christian Ottow, Ronald Schulz, Heidi Pfeiffer, Walter Heindel, Andreas Schmeling, Volker Vieth
OBJECTIVES: To clarify the relevance of the bony fusion of the distal femoral and the proximal tibial epiphyses by means of magnetic resonance imaging (MRI), a prospective cross-sectional cohort study was performed with a special focus on a reliable determination of the 14th, 16th and 18th years of life. METHODS: We scanned 658 German volunteers in the age bracket 12-24 years using a 3.0 T MR-scanner and utilising a T1 turbo spin-echo sequence representing true bone anatomy...
July 4, 2017: European Radiology
https://www.readbyqxmd.com/read/28668413/comparison-of-3d-bone-models-of-the-knee-joint-derived-from-ct-and-3t-mr-imaging
#10
Aleš Neubert, Katharine J Wilson, Craig Engstrom, Rachel K Surowiec, Anthony Paproki, Nicholas Johnson, Stuart Crozier, Jurgen Fripp, Charles P Ho
PURPOSE: To examine whether magnetic resonance (MR) imaging can offer a viable alternative to computed tomography (CT) based 3D bone modeling. METHODS: CT and MR (SPACE, TrueFISP, VIBE) images were acquired from the left knee joint of a fresh-frozen cadaver. The distal femur, proximal tibia, proximal fibula and patella were manually segmented from the MR and CT examinations. The MR bone models obtained from manual segmentations of all three sequences were compared to CT models using a similarity measure based on absolute mesh differences...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28660404/isolated-peroneal-tenosynovial-lipoma-arborescens-multimodality-imaging-features
#11
Wilbur Wang, Dorota D Linda, Evelyne Fliszar, Anna A Kulidjian, Brady K Huang
Synovial lipoma arborescens is a rare and benign fatty proliferative lesion of the synovium that is most commonly seen within the suprapatellar pouch of the knee, but increasingly reported to involve tendon sheaths, including those of the ankle. We present the third known case of tenosynovial lipoma arborescens isolated to the peroneal tendon sheath without ankle joint involvement. To our knowledge, this is the first to report this entity utilizing a unique combination of radiographic, sonographic, and MR imaging, along with intraoperative and histologic correlation...
June 28, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28651649/relationship-between-knee-osteoarthritis-and-meniscal-shape-in-observation-of-japanese-patients-by-using-magnetic-resonance-imaging
#12
Tsuneo Kawahara, Takahisa Sasho, Joe Katsuragi, Takashi Ohnishi, Hideaki Haneishi
BACKGROUND: The aims of this study were to reveal the characteristics of the meniscal shape at each knee osteoarthritis (OA) severity level and to predict trends or patterns of the meniscal shape change as associated with knee OA progression. METHODS: Fifty-one patients diagnosed with knee OA based on X-ray and magnetic resonance (MR) images were evaluated. They were divided into three groups based on the Kellgren-Lawrence (KL) grade: normal group (KL grade of 0 or 1), mild group (KL grade of 2 or 3), and severe group (KL grade of 4)...
June 26, 2017: Journal of Orthopaedic Surgery and Research
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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