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https://www.readbyqxmd.com/read/28324130/the-oblique-popliteal-ligament-an-anatomic-and-mri-investigation
#1
Mandy Hedderwick, Mark D Stringer, Liam McRedmond, Grant R Meikle, Stephanie J Woodley
PURPOSE: Despite being the largest ligament on the posterior aspect of the knee, relatively little is known about the normal morphology of the oblique popliteal ligament (OPL). The aim of this study was to investigate the detailed anatomy of the OPL in cadavers and healthy volunteers. METHODS: The posterior knee was investigated in 25 cadaver lower limbs (mean age 76 ± 9.5 years; 7 men) by dissection, histology, and serial plastination and in 14 healthy individuals (mean age 23 ± 3...
March 21, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28314900/bony-landmark-between-the-attachment-of-the-medial-meniscus-posterior-root-and-the-posterior-cruciate-ligament-ct-and-mr-imaging-assessment
#2
Masataka Fujii, Takayuki Furumatsu, Shinichi Miyazawa, Yuya Kodama, Tomohito Hino, Yusuke Kamatsuki, Toshifumi Ozaki
OBJECTIVES: (1) To reveal the prevalence of the bony recess (posterior dimple) and (2) to determine the position of the posterior dimple on the tibial plateau using three-dimensional computed tomography (3DCT). MATERIALS AND METHODS: In this study, a retrospective review of 112 patients was performed to identify the posterior dimple and to evaluate its position on 3DCT. Magnetic resonance images (MRIs) were also used to determine the positional relationship among the posterior cruciate ligament (PCL), medial meniscus posterior insertion (MMPI), and posterior dimple...
March 18, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28267362/variability-in-patellofemoral-alignment-measurements-on-mri-influence-of-knee-position
#3
Alejandro Marquez-Lara, Jason Andersen, Leon Lenchik, Cristin M Ferguson, Pushpender Gupta
OBJECTIVE: The purpose of this study was to determine the variability of distances between four distinct anatomic landmarks used for the evaluation of patellofemoral alignment while implementing controlled changes in patient positioning during MRI. MATERIALS AND METHODS: Limited MRI was performed of 12 knees in healthy volunteers (10 men, two women; mean age, 28 years) with the knees in four different positions. The four landmarks used were TT (the most anterior point of the osseous tibial tubercle), TG (the nadir of the cartilaginous trochlear groove), PT (the center of the patellar tendon insertion on the tibia), and PCL (the medial border of the posterior cruciate ligament at its insertion along the posterior tibia)...
March 7, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28261861/orthogonally-combined-motion-and-diffusion-sensitized-driven-equilibrium-oc-mdsde-preparation-for-vessel-signal-suppression-in-3d-turbo-spin-echo-imaging-of-peripheral-nerves-in-the-extremities
#4
Barbara Cervantes, Jan S Kirschke, Elizabeth Klupp, Hendrik Kooijman, Peter Börnert, Axel Haase, Ernst J Rummeny, Dimitrios C Karampinos
PURPOSE: To design a preparation module for vessel signal suppression in MR neurography of the extremities, which causes minimal attenuation of nerve signal and is highly insensitive to eddy currents and motion. METHODS: The orthogonally combined motion- and diffusion-sensitized driven equilibrium (OC-MDSDE) preparation was proposed, based on the improved motion- and diffusion-sensitized driven equilibrium methods (iMSDE and FC-DSDE, respectively), with specific gradient design and orientation...
March 5, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28247430/a-novel-phase-unwrapping-method-based-on-pixel-clustering-and-local-surface-fitting-with-application-to-dixon-water-fat-mri
#5
Junying Cheng, Yingjie Mei, Biaoshui Liu, Jijing Guan, Xiaoyun Liu, Ed X Wu, Qianjin Feng, Wufan Chen, Yanqiu Feng
PURPOSE: To develop and evaluate a novel 2D phase-unwrapping method that works robustly in the presence of severe noise, rapid phase changes, and disconnected regions. THEORY AND METHODS: The MR phase map usually varies rapidly in regions adjacent to wraps. In contrast, the phasors can vary slowly, especially in regions distant from tissue boundaries. Based on this observation, this paper develops a phase-unwrapping method by using a pixel clustering and local surface fitting (CLOSE) approach to exploit different local variation characteristics between the phase and phasor data...
March 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28245669/the-nearly-invisible-intraneural-cyst-a-new-and-emerging-part-of-the-spectrum
#6
Thomas J Wilson, Marie-Noëlle Hébert-Blouin, Naveen S Murthy, Joaquín J García, Kimberly K Amrami, Robert J Spinner
OBJECTIVE The authors have observed that a subset of patients referred for evaluation of peroneal neuropathy with "negative" findings on MRI of the knee have subtle evidence of a peroneal intraneural ganglion cyst on subsequent closer inspection. The objective of this study was to introduce the nearly invisible peroneal intraneural ganglion cyst and provide illustrative cases. The authors further wanted to identify clues to the presence of a nearly invisible cyst. METHODS Illustrative cases demonstrating nearly invisible peroneal intraneural ganglion cysts were retrospectively reviewed and are presented...
March 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28237607/knee-morphometric-and-alignment-measurements-with-mr-imaging-in-young-adults-with-central-cartilage-lesions-of-the-patella-and-trochlea
#7
R Sebro, S Weintraub
PURPOSE: The goal of this study was to assess whether common measurements of patellar and trochlear morphology and patellar alignment are associated with central cartilage lesions of the patella and trochlea using magnetic resonance imaging (MRI). METHODS: The MRI examinations of 58 patients (38 women, 20 men; mean age, 28.59 years [range: 19-35 years]) with central cartilage lesions of the patella and trochlea were retrospectively compared to those obtained in 102 control subjects (57 women, 45 men; mean age, 27...
February 22, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28237185/relationship-between-t1rho-magnetic-resonance-imaging-synovial-fluid-biomarkers-and-the-biochemical-and-biomechanical-properties-of-cartilage
#8
Courtney C Hatcher, Amber T Collins, Sophia Y Kim, Lindsey C Michel, William C Mostertz, Sophia N Ziemian, Charles E Spritzer, Farshid Guilak, Louis E DeFrate, Amy L McNulty
Non-invasive techniques for quantifying early biochemical and biomechanical changes in articular cartilage may provide a means of more precisely assessing osteoarthritis (OA) progression. The goals of this study were to determine the relationship between T1rho magnetic resonance (MR) imaging relaxation times and changes in cartilage composition, cartilage mechanical properties, and synovial fluid biomarker levels and to demonstrate the application of T1rho imaging to evaluate cartilage composition in human subjects in vivo...
February 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28210945/mr-imaging-evaluation-of-the-postoperative-meniscus
#9
REVIEW
A Russo, R Capasso, C Varelli, A Laporta, M Carbone, G D'Agosto, S Giovine, M Zappia, A Reginelli
MR imaging has been widely evaluated in the assessment of patients with recurrent or residual symptoms following meniscal surgery. Importantly, the causes of such symptoms may relate to failure or complication of the surgical procedure, a possible recurrent or residual meniscal tear, or may be related to other causes of joint symptoms, including tears of the contralateral meniscus, or local hyaline cartilage, or marrow abnormalities subjacent to or distant to the meniscal surgical site. The complex diagnostic issues involved in the MR imaging evaluation of the postoperative meniscus were identified in early MR imaging studies...
February 16, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28209275/contact-kinematic-differences-between-gap-balanced-vs-measured-resection-techniques-for-single-radius-posterior-stabilized-total-knee-arthroplasty
#10
Matthew G Teeter, Kevin I Perry, Xunhua Yuan, James L Howard, Brent A Lanting
BACKGROUND: Measured resection (MR) and gap balancing (GB) are common surgical techniques for total knee arthroplasty (TKA). Controversy has arisen as each conceptually differs in how the knee is balanced through bone and soft tissue management. The objective of the present study was to compare both the frequency of condylar liftoff and the location of femorotibial contact from extension through midflexion between patients undergoing GB or MR TKA. METHODS: A total of 24 knees (23 patients) were randomly assigned at referral to either a surgeon performing MR or GB TKA with the same single radius, posterior-stabilized implant (12 per cohort)...
January 11, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28206712/medial-femur-t2-z-scores-predict-the-probability-of-knee-structural-worsening-over-4-8-years-data-from-the-osteoarthritis-initiative
#11
Gabby B Joseph, Charles E McCulloch, Michael C Nevitt, Alexandra S Gersing, Benedikt J Schwaiger, Martin Kretzschmar, Ursula Heilmeier, Thomas M Link
OBJECTIVE: The purpose of this study was to determine the probability of structural worsening of knee cartilage and whole joint degeneration over 4-8 years based on cartilage T2 Z-scores at baseline. DESIGN: Right knees with Kellgren-Lawrence (KL) grades of 0-2 in 587 participants from the Osteoarthritis Initiative were studied. 3T MR images were used to perform baseline cartilage T2 quantification and assess 4-year changes in cartilage morphology (WORMS scoring) in 5 regions...
February 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28203389/mr-appearance-of-the-temporal-evolution-and-resolution-of-spontaneous-osteonecrosis-of-the-knee-a-case-report
#12
Mats Geijer, Jan Jureus, Mari Hanni, Adel Shalabi
Spontaneous osteonecrosis of the knee (SONK) is a feared condition of unknown cause, in its classic form appearing in the medial femoral condyle in middle-aged or elderly subjects. Diagnosis with radiography is notoriously difficult with a long latency before typical changes appear. Magnetic resonance imaging (MRI) is regarded as a diagnostic tool with the possibility to give an earlier diagnosis with improved chances for treatment. However, also with MRI there may be an initial diagnostic blind spot before typical changes appear...
February 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/28199129/a-focal-defect-at-the-lateral-patellar-retinaculum-on-clinical-knee-mri-and-cadaveric-study-a-normal-variant-or-pathologic-lesion
#13
Ji Su Kim, Seong Jong Yun, Wook Jin, Gou Young Kim, So Young Park, Ji Seon Park, Kyung Nam Ryu
OBJECTIVE: The purpose of this study is to retrospectively investigate the frequency of a focal defect at the lateral patellar retinaculum on knee MRI and to determine the variables that are significantly associated with the defect. MATERIALS AND METHODS: Two radiologists independently reviewed 99 knee MR images for the presence of a focal defect at the lateral patellar retinaculum and categorized patients with concordant results into two groups: a group with the defect (≥ 3 mm; group 1) and a group without the defect (< 3 mm; group 2)...
February 15, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28147215/attenuated-synovial-fluid-ghrelin-levels-are-linked-with-cartilage-damage-meniscus-injury-and-clinical-symptoms-in-patients-with-knee-anterior-cruciate-ligament-deficiency
#14
Yu-Cong Zou, Liang-Hua Chen, Yong-Liang Ye, Guang-Gang Yang, Zheng Mao, Dan-Dan Liu, Jun-Qi Chen, Jing-Jie Chen, Gang Liu
BACKGROUND: The meniscus injury and post-traumatic knee osteoarthritis (PTOA) following anterior cruciate ligament (ACL) lesions often cause great burdens to patients. Ghrelin, a recently identified 28-amino-acid peptide, has been shown to inhibit inflammation and perform as a growth factor for chondrocyte. OBJECTIVE: This study was aimed at investigating ghrelin concentration in synovial fluid and its association with the degree of meniscus injury, articular degeneration, and clinical severity in patients suffering from anterior cruciate ligament (ACL) deficiency...
December 2016: Discovery Medicine
https://www.readbyqxmd.com/read/28128708/detection-of-stem-cell-transplant-rejection-with-ferumoxytol-mr-imaging-correlation-of-mr-imaging-findings-with-those-at-intravital-microscopy
#15
Heike E Daldrup-Link, Carmel Chan, Olga Lenkov, Seyedmeghdad Taghavigarmestani, Toktam Nazekati, Hossein Nejadnik, Fanny Chapelin, Aman Khurana, Xinming Tong, Fan Yang, Laura Pisani, Michael Longaker, Sanjiv Sam Gambhir
Purpose To determine whether endogenous labeling of macrophages with clinically applicable nanoparticles enables noninvasive detection of innate immune responses to stem cell transplants with magnetic resonance (MR) imaging. Materials and Methods Work with human stem cells was approved by the institutional review board and the stem cell research oversight committee, and animal experiments were approved by the administrative panel on laboratory animal care. Nine immunocompetent Sprague-Dawley rats received intravenous injection of ferumoxytol, and 18 Jax C57BL/6-Tg (Csf1r-EGFP-NGFR/FKBP1A/TNFRSF6) 2Bck/J mice received rhodamine-conjugated ferumoxytol...
January 27, 2017: Radiology
https://www.readbyqxmd.com/read/28117922/elevated-adiabatic-t1%C3%AF-and-t2%C3%AF-in-articular-cartilage-are-associated-with-cartilage-and-bone-lesions-in-early-osteoarthritis-a-preliminary-study
#16
Victor Casula, Mikko J Nissi, Jana Podlipská, Marianne Haapea, Juhani M Koski, Simo Saarakkala, Ali Guermazi, Eveliina Lammentausta, Miika T Nieminen
PURPOSE: To evaluate adiabatic T1ρ and T2ρ of articular cartilage in symptomatic osteoarthritis (OA) patients and asymptomatic volunteers, and to determine their association with magnetic resonance imaging (MRI)-based structural abnormalities in cartilage and bone. MATERIALS AND METHODS: A total of 24 subjects (age range: 50-68 years; 12 female) were enrolled, including 12 early OA patients and 12 volunteers with normal joint function. Patients and volunteers underwent 3T MRI...
January 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28090444/bone-marrow-edema-like-lesions-bmels-are-associated-with-higher-t1%C3%AF-and-t2-values-of-cartilage-in-anterior-cruciate-ligament-acl-reconstructed-knees-a-longitudinal-study
#17
Jingshan Gong, Valentina Pedoia, Luca Facchetti, Thomas M Link, C Benjamin Ma, Xiaojuan Li
BACKGROUND: To evaluate the longitudinal changes of bone marrow edema-like lesions (BMELs) in patients after anterior cruciate ligament (ACL) reconstruction and to investigate the effect of BMELs on cartilage matrix composition changes measured using MR T1ρ and T2 mapping. METHODS: Patients with acute ACL tear were enrolled in a prospective study. MR imaging was performed at baseline (before surgeries) and at 6-month, 1-year and 2-year after ACL reconstruction...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28090441/principal-component-analysis-t1%C3%AF-voxel-based-relaxometry-of-the-articular-cartilage-a-comparison-of-biochemical-patterns-in-osteoarthritis-and-anterior-cruciate-ligament-subjects
#18
Valentina Pedoia, Colin Russell, Allison Randolph, Xiaojuan Li, Sharmila Majumdar
BACKGROUND: Quantitative MR, including T1ρ mapping, has been extensively used to probe early biochemical changes in knee articular cartilage of subjects with osteoarthritis (OA) and others at risk for cartilage degeneration, such as those with anterior cruciate ligament (ACL) injury and reconstruction. However, limited studies have been performed aimed to assess the spatial location and patterns of T1ρ. In this study we used a novel voxel-based relaxometry (VBR) technique coupled with principal component analysis (PCA) to extract relevant features so as to describe regional patterns and to investigate their similarities and differences in T1ρ maps in subjects with OA and subjects six months after ACL reconstruction (ACLR)...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28027735/comparison-of-t2-relaxation-times-of-articular-cartilage-of-the-knee-in-elite-professional-football-players-and-age-and-bmi-matched-amateur-athletes
#19
COMPARATIVE STUDY
C Behzadi, G H Welsch, A Laqmani, F O Henes, M G Kaul, G Schoen, G Adam, M Regier
OBJECTIVE: Recent investigation has underlined the potential of quantitative MR imaging to be used as a complementary tool for the diagnosis of cartilage degeneration at an early state. The presented study analyses T2* relaxation times of articular cartilage of the knee in professional athletes and compares the results to age- and BMI (Body Mass Index)-matched healthy amateur athletes. MATERIALS AND METHODS: 22 professional football players and 22 age- and BMI-matched individuals were underwent knee Magnetic Resonance Imaging (MRI) at 3T including qualitative and quantitative analysis...
January 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/27986620/subchondral-bone-in-osteoarthritis-association-between-mri-texture-analysis-and-histomorphometry
#20
J W MacKay, P J Murray, B Kasmai, G Johnson, S T Donell, A P Toms
OBJECTIVE: Magnetic resonance imaging (MRI) texture analysis is a method of analyzing subchondral bone alterations in osteoarthritis (OA). The objective of this study was to evaluate the association between MR texture analysis and ground-truth subchondral bone histomorphometry at the tibial plateau. DESIGN: The local research ethics committee approved the study. All subjects provided written, informed consent. This was a cross-sectional study carried out at our institution between February and August 2014...
December 13, 2016: Osteoarthritis and Cartilage
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