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Scaphoid imaging

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https://www.readbyqxmd.com/read/28494943/kinematic-analysis-of-the-scaphoid-using-gated-four-dimensional-ct
#1
I S Mat Jais, S C Tay
AIM: To investigate the kinematics of the scaphoid while the wrist was in radioulnar motion using gated four-dimensional computed tomography (4DCT) imaging. MATERIALS AND METHODS: Six cadaveric wrist specimens were scanned in the following order of capsulotomy and ligament sectioning: (1) ligaments intact, (2) capsulotomy, (3) scapholunate ligament division, and lastly, (4) lunotriquetral ligament division. A three-dimensional model was then reconstructed to analyse the translation and angular displacements of the scaphoid...
May 7, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28448708/-wrist-x-ray-for-analysis-of-the-articular-surface-of-distal-radius
#2
E Vergara-Amador, R Penagos, E Pinilla
In the distal radius fracture requires radiographic views that allow you to see the articular surface without interposition. The objective was to determine whether lateral radiographic projections 7 and 22° improve the analysis of this surface. METHOD: Case series study with radiographs of healthy and operated patients, in order to identify the lunate and scaphoid facets in lateral and anteroposterior projections. Qualitative analysis was made on the radiographs of the distal radius with wedges of 7 and 22° in the lateral views and 11° in the anteroposterior view...
September 2016: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28428913/comparison-of-magnetic-resonance-imaging-and-radiographs-for-evaluation-of-carpal-osteoarthritis
#3
Angela E Li, Steve K Lee, Schneider K Rancy, Alissa J Burge, Hollis G Potter, Scott W Wolfe
Background We sought to evaluate the interobserver and intraobserver reliability of radiographs and magnetic resonance imaging (MRI) for grading of osteoarthritis in patients with scapholunate advanced collapse (SLAC) and scaphoid nonunion advanced collapse (SNAC), and to determine whether MRI is more likely than radiographs to detect carpal osteoarthritis. Methods Radiographs and MR studies of 46 patients with SLAC and SNAC arthritis were reviewed by two hand surgeons and two radiologists and were graded according to severity of osteoarthritis at seven carpal joints...
May 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28344525/mri-correlation-of-radial-head-fractures-and-forearm-injuries
#4
Hisham Awan, Robert Goitz
Background: Radial head fractures can be associated with soft tissue injuries of the forearm and wrist. The Essex-Lopresti injury can lead to significant morbidity, especially if the diagnosis is not made acutely. Better identification of such injuries is needed to allow optimal surgical treatment and prevent long-term sequelae. We used magnetic resonance imaging (MRI) to correlate the degree of soft tissue injuries with radial head fractures. Methods: Sixteen pairs of forearms with an associated radial head fracture in 15 patients prospectively underwent an MRI within 2 weeks of their injury...
March 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28298506/scaphoid-imaging-and-its-challenges
#5
Elizabeth A Paterson, Jonathan B Havrda
No abstract text is available yet for this article.
March 2017: Radiologic Technology
https://www.readbyqxmd.com/read/28292199/high-resolution-mri-of-the-ulnar-and-radial-collateral-ligaments-of-the-wrist
#6
Taiki Nozaki, Wei Der Wu, Yasuhito Kaneko, Gregory Rafijah, Lily Yang, Dave Hitt, Hiroshi Yoshioka
Background Accurate diagnosis of injuries to the collateral ligaments of the wrist is technically challenging on MRI. Purpose To investigate usefulness of high-resolution two-dimensional (2D) and isotropic three-dimensional (3D) magnetic resonance imaging (MRI) for identifying and classifying the morphology of the ulnar and radial collateral ligaments (UCL and RCL) of the wrist. Material and Methods Thirty-seven participants were evaluated using 3T coronal 2D and isotropic 3D images by two radiologists independently...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28273677/-first-results-with-a-resorbable-mgyrezr-compression-screw-in-unstable-scaphoid-fractures-show-extensive-bone-cysts
#7
Reinhard Meier, Martin Panzica
Osteosynthesis with headless compression screws is an established treatment option for unstable scaphoid fractures. Common implants are made of titanium alloy or steel and usually remain in place. Due to implant density and ferromagnetic properties, artefacts are common in postoperative imaging procedures, e.g. MRI. Now resorbable implants made of magnesium alloy (MgYREZr) have become available. They have biomechanical properties equivalent to human bone and may be used as an alternative to the nonresorbable screw systems...
February 2017: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
https://www.readbyqxmd.com/read/28260129/validity-of-computed-tomography-in-predicting-scaphoid-screw-prominence-a-cadaveric-study
#8
Clare E Griffis, Cara Olsen, Leon Nesti, C Frank Gould, Michael Frew, Patricia McKay
BACKGROUND: Studies of hardware protrusion into joint spaces following fracture fixation have been performed to address whether or not there is discrepancy between the actual and radiographic appearance of screw prominence. The purpose of our study was to prove that, with respect to the scaphoid, prominence as visualized on CT scan is real and not a result of metal artifact. METHODS: Forty-two cadaveric wrists were separated into four allotted groups with 21 control specimens and 21 study specimens...
March 4, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28259113/surgeon-based-3d-printing-for-microvascular-bone-flaps
#9
Erin M Taylor, Matthew L Iorio
Background Three-dimensional (3D) printing has developed as a revolutionary technology with the capacity to design accurate physical models in preoperative planning. We present our experience in surgeon-based design of 3D models, using home 3D software and printing technology for use as an adjunct in vascularized bone transfer. Methods Home 3D printing techniques were used in the design and execution of vascularized bone flap transfers to the upper extremity. Open source imaging software was used to convert preoperative computed tomography scans and create 3D models...
March 4, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28251560/scaphoid-fractures-in-the-athlete
#10
REVIEW
Mark J Winston, Andrew J Weiland
Scaphoid fractures are a common wrist injury, especially in athletes. Clinicians should have a high index of suspicion for a scaphoid fracture in any patient complaining of radial-sided wrist pain after a fall on an outstretched hand. Advanced imaging, including CT and MRI scans, may be useful in diagnosis and classification of fracture patterns. Treatment varies based on the fracture location, stability of the fracture, and predictability of the fracture to heal. Treatment involves either non-operative management with a thumb spica cast or brace, or operative fixation with a headless compression screw, k-wires, or scaphoid-specific plates...
March 2017: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/28184356/how-trustworthy-are-clinical-examinations-and-plain-radiographs-for-diagnosis-of-scaphoid-fractures
#11
Mohammad Reza Ghane, Mohammad Saeid Rezaee-Zavareh, Mohammad Kazem Emami-Meibodi, Vahid Dehghani
BACKGROUND: Sometimes patients with a scaphoid fracture, especially in an acute phase of injury, can have normal radiographs and, therefore, initial diagnosis of the scaphoid fracture may be neglected. In this study, we determined the value in of clinical examination and a radiograph in the diagnosis of scaphoid fracture based on the results of a two-week follow-up magnetic resonance imaging (MRI). OBJECTIVES: In this study, sought to assess the value of using both a clinical examination (tenderness of scaphoid tubercle, tenderness of anatomical snuffbox, and compression test) and radiographic imaging in the diagnosis of scaphoid fractures based on the results after a two-week follow-up MRI...
November 2016: Trauma Monthly
https://www.readbyqxmd.com/read/28149212/thumb-metacarpal-subsidence-after-partial-trapeziectomy-with-capsular-interposition-arthroplasty-a-biomechanical-study
#12
Christina Salas, Deana M Mercer, Gavin O'Mahony, James Love, Dukens LaBaze, Moheb S Moneim
Background: In a cadaveric model, we evaluated thumb metacarpal subsidence, indicated by a decreased metacarpal-to-scaphoid distance, after 2 surgical procedures used to treat thumb carpometacarpal (CMC) osteoarthritis (OA): partial trapeziectomy with capsular interposition (PTCI), which involves removal of 2 mm of both the distal trapezium and base of the metacarpal; and total trapeziectomy with capsular interposition (TTCI). Methods: Nine matched pairs of cadaveric hands were randomly assigned to undergo either PTCI or TTCI...
December 2016: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28114317/the-scaphoid-safe-zone-a-radiographic-simulation-study-to-prevent-cortical-perforation-arising-from-different-views
#13
Qi Quan, Lei Hong, Biao Chang, Ruoxi Liu, Yun Zhu, Jiang Peng, Qing Zhao, Shibi Lu
PURPOSE: The purpose of this study was to simulate and calculate the probability of iatrogenic perforation of the scaphoid cortical bone when internal fixation appeared to be safe on radiographs. The results will assist surgeons in determining proper screw placement. METHODS: Thirty scaphoids were reconstructed using computed tomography data and image-processing software. Different central axes were determined by the software to simulate the surgical views. The safe zone (SZ) and risk zone (RZ) were identified on the axial projection radiographs by comparing the scaphoid bone stenosis measured by the fluoroscopic radiographs with a three-dimensional reconstruction of the scaphoid stenosis...
2017: PloS One
https://www.readbyqxmd.com/read/28027846/pediatric-scaphoid-proximal-pole-nonunion-with-avascular-necrosis
#14
Edward W Jernigan, Brandon S Smetana, J Megan M Patterson
A 13-year-old, right hand-dominant, otherwise healthy boy presented with left wrist pain 19 months after a nonmotorized scooter injury. Radiographs and magnetic resonance imaging at presentation demonstrated proximal pole scaphoid nonunion with avascular necrosis of the proximal fragment. Operative and nonsurgical treatment options were discussed and the family elected for an attempt at nonsurgical management. The patient was placed in a short-arm thumb spica cast, with a window for a bone stimulator, for 14 weeks...
April 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28012704/tomosynthesis-a-new-radiologic-technique-for%C3%A2-rapid-diagnosis-of-scaphoid-fractures
#15
N Compton, L Murphy, F Lyons, J Jones, P MacMahon, J Cashman
Scaphoid fractures constitute 71% of all carpal bone fractures.(1) Early diagnosis and treatment has significant bearing on fracture union rates and better clinical outcomes. While displaced fractures can be readily seen on plain radiograph, undisplaced fractures can require advanced imaging modalities to confirm that diagnosis. Advanced imaging such as Magnetic Resonance Imaging (MRI), Computerised tomography (CT) and bone scintigraphy are routinely used for the diagnosis of scaphoid fractures but require significant radiation exposure, increased cost and can be difficult to access...
December 21, 2016: Surgeon: Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland
https://www.readbyqxmd.com/read/27920391/dorsal-intercalated-segmental-instability-associated-with-malunion-of-a-reconstructed-scaphoid
#16
J-H Kim, K-H Lee, B G Lee, C-H Lee, S-J Kim, W-S Choi
We analysed scaphoid deformity as a result of surgical treatment of scaphoid fracture nonunion and assessed the deformity associated with a dorsal intercalated segmental instability pattern of carpal malalignment. A total of 45 patients who were treated for scaphoid fracture nonunion were included in the study. The height-to-length ratio of the scaphoid was measured on computed tomographic images and used to assess scaphoid deformity. Carpal malalignment was quantified based on the radio-lunate angle. A correlation analysis between the height-to-length ratio and the radio-lunate angle was performed...
December 5, 2016: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/27890247/reproducibility-of-x-rays-and-ct-arthrography-in-slac-snac-scac-wrists
#17
R Belhaouane, N Lebeau, C Maes-Clavier, C Hustin, E Krief, B Bonnaire, M Warin, V Rotari, E David
The purpose of this study was to assess the inter-observer and intra-observer reproducibility of the interpretation of CT arthrography and plain X-rays for scapholunate advanced collapse (SLAC), scaphoid non-union advanced collapse (SNAC) and scaphoid chondrocalcinosis advanced collapse (SCAC) wrist conditions, as well as the clinical relevance of these imaging modalities. The CT and X-rays images were reviewed twice in a blinded and randomized manner by two experienced orthopedic surgeons specialized in hand surgery, two orthopedic surgery residents and two experienced radiologists specialized in bone and joint imaging...
December 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27847847/inter-observer-agreement-between-2-dimensional-ct-versus-3-dimensional-i-space-model-in-the-diagnosis-of-occult-scaphoid-fractures
#18
Tessa Drijkoningen, Robert Knoter, Emile G Coerkamp, Anton H J Koning, Steven J Rhemrev, Frank J Beeres
BACKGROUND: The I-Space is a radiological imaging system in which Computed Tomography (CT)-scans can be evaluated as a three dimensional hologram. The aim of this study is to analyze the value of virtual reality (I-Space) in diagnosing acute occult scaphoid fractures. METHODS: A convenient cohort of 24 patients with a CT-scan from prior studies, without a scaphoid fracture on radiograph, yet high clinical suspicion of a fracture, were included in this study. CT-scans were evaluated in the I-Space by 7 observers of which 3 observers assessed the scans in the I-Space twice...
October 2016: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/27777822/the-role-of-dynamic-4d-ct-in-the-detection-of-scapholunate-ligament-injury
#19
Sanjeev Kakar, Ryan E Breighner, Shuai Leng, Cynthia H McCollough, Steven L Moran, Richard A Berger, Kristin D Zhao
Background Scapholunate (SL) interosseus ligament injuries detected at an early stage could allow the surgeon to prevent progression through the spectrum of injury that leads to instability, and eventually osteoarthritis. We contend that early instability following injury can be detected by visualizing the relative motions and distances between the involved carpal bones (scaphoid and lunate) during wrist movement in vivo. The purpose of this study is to demonstrate the utility of dynamic CT (i.e., 4DCT) in diagnosing SL interosseus ligament injuries in two patients with clinical suspicion of SL interosseus ligament injury during flexion-extension (FE), radial-ulnar (RU) deviation, and dart thrower's (DT) motions...
November 2016: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/27725994/-acute-scaphoid-fractures-management-under-consideration-of-the-new-s3-level-guideline
#20
M Schädel-Höpfner, B Bickert, C Dumont, P Laier, R Meier, A Nusche, T Pillukat, H Rosenthal, R Schmitt, F Siemers, A Zach, M Jung
BACKGROUND: Scaphoid fractures represent the most common carpal fractures and are often problematic and frequently lead to nonunion with osteoarthritis and collapse of the wrist. The reasons for the nonunion are manifold. Therefore, the main goal of diagnosis and therapy of acute fractures is to achieve bony union and to restore the anatomic shape of the scaphoid. In the long run, only this can preserve the normal function of the wrist. METHODOLOGY: The given recommendations are based on the new S3-level guideline of the AWMF (Association of the Scientific Medical Societies)...
November 2016: Der Orthopäde
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