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https://www.readbyqxmd.com/read/28099304/three-dimensional-analysis-of-acute-scaphoid-fracture-displacement-proximal-extension-deformity-of-the-scaphoid
#1
Yonatan Schwarcz, Yael Schwarcz, Eran Peleg, Leo Joskowicz, Ronit Wollstein, Shai Luria
BACKGROUND: Our goal was to analyze the movement of acute scaphoid waist fracture fragments and adjacent bones in a common coordinate system. Our hypothesis was that the distal scaphoid fragment flexes and pronates and the proximal fragment extends. METHODS: Computed tomography (CT) scans of patients diagnosed with an acute scaphoid waist fracture were evaluated using a 3-dimensional (3D) model. The scans of 57 nondisplaced and 23 displaced fractures were compared with a control group of 27 scans showing no pathological involvement of the wrist...
January 18, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28089369/deciphering-the-fringe-mediated-notch-code-identification-of-activating-and-inhibiting-sites-allowing-discrimination-between-ligands
#2
Shinako Kakuda, Robert S Haltiwanger
Fringe proteins are β3-N-acetylglucosaminyltransferases that modulate Notch activity by modifying O-fucose residues on epidermal growth factor-like (EGF) repeats of Notch. Mammals have three Fringes: Lunatic, Manic, and Radical. While Lunatic and Manic Fringe inhibit Notch1 activation from Jagged1 and enhance activation from Delta-like 1, Radical Fringe enhances signaling from both. We used a mass spectrometry approach to determine whether the variable effects of Fringes on Notch1 result from generation of unique glycosylation patterns on Notch1...
December 29, 2016: Developmental Cell
https://www.readbyqxmd.com/read/28018087/a-unique-case-of-bilateral-trans-scaphoid-perilunate-dislocation-with-dislocation-of-lunate-into-the-forearm
#3
Siddharth R Virani, Sagar Wajekar, Hariharan Mohan, Aditya A Dahapute
INTRODUCTION: Perilunate dislocations are commonly seen after fall on an outstretched hand in extremes of dorsiflexion and ulnar deviation. A greater arc injury is one when there is an associated fracture of one or more bones around the lunate while a lesser arc injury is associated with pure ligamentous disruption around the lunate. CASE REPORT: We report a unique case of bilateral trans-scaphoid perilunate dislocation in a 35-year-old male labourer. This is the first reported case where the lunate dislocated into the forearm on the volar aspect...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28018058/intramedullary-screw-and-kirschner-wire-fixation-for-unstable-scaphoid-nonunion
#4
Raviv Allon, Aviv Kramer, Ronit Wollstein
Surgical treatment of scaphoid nonunion is not always successful, often requiring stabilization and bone grafting to achieve healing. Even after intramedullary screw fixation, residual instability may still hinder union. The purpose of this study was to describe the addition of Kirschner wires (KWs) through the capitate and the lunate to supplement an intramedullary screw for temporary enhanced stability, possibly improving healing of unstable fractures. A case-control study reviewing 25 cases with addition of KWs and 19 controls was performed...
December 2016: Journal of Hand and Microsurgery
https://www.readbyqxmd.com/read/28017515/extreme-proximal-migration-of-dislocated-lunate-over-carpal-ligament-a-case-report
#5
Jun-Mo Lee, Jong-Kil Kim, Kwang-Bok Lee
Dislocation of the lunate and proximal pole of the scaphoid with displacement of the fragments proximal to the radiocarpal joint, characterized as a total dislocation, is very rare, with only six cases reported. Dislocated lunate are generally located around the radiocarpal joint or within carpal ligament. However, there have been no reports of dislocated lunate over the carpal ligament. We present a patient with volar dislocation of the lunate that featured extreme migration to approximately 6 cm proximal to flexor digitorum superficialis through the transcarpal ligament...
December 22, 2016: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/27984361/dorsal-distraction-plating-and-lunate-decortication-for-stage-iii-kienb%C3%A3-ck-disease-a-novel-technique
#6
Michael D Wigton, Omar F Nazir, Benjamin R Graves, Peter J Apel, Zhongyu Li
Kienböck disease (KD) is a progressive condition and difficult to manage. A number of treatment algorithms exist but there is no clear consensus as to which method produces the best outcome, particularly for Lichtman stage III disease. The majority of the current treatment options for KD emphasize lunate unloading and restoration of biology with bone graft. However, less attention has been given to the protection of the lunate during revascularization process. We report a novel technique of lunate decompression and bone grafting, combined with wrist distraction with or without radial shortening osteotomy via dorsal wrist bridge plating for the treatment of stage II-IIIa/b KD...
December 14, 2016: Techniques in Hand & Upper Extremity Surgery
https://www.readbyqxmd.com/read/27921206/periacetabular-osteotomy-provides-higher-survivorship-than-rim-trimming-for-acetabular-retroversion
#7
Corinne A Zurmühle, Helen Anwander, Christoph E Albers, Markus S Hanke, Simon D Steppacher, Klaus A Siebenrock, Moritz Tannast
BACKGROUND: Acetabular retroversion can cause impaction-type femoroacetabular impingement leading to hip pain and osteoarthritis. It can be treated by anteverting periacetabular osteotomy (PAO) or acetabular rim trimming with refixation of the labrum. There is increasing evidence that acetabular retroversion is a rotational abnormality of the entire hemipelvis and not a focal overgrowth of the anterior acetabular wall, which favors an anteverting PAO. However, it is unknown if this larger procedure would be beneficial in terms of survivorship and Merle d'Aubigné scores in a midterm followup compared with rim trimming...
December 5, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27920391/dorsal-intercalated-segmental-instability-associated-with-malunion-of-a-reconstructed-scaphoid
#8
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...
December 5, 2016: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/27916152/volar-ulnar-approach-for-fixation-of-the-volar-lunate-facet-fragment-in-distal-radius-fractures-a-technical-tip
#9
REVIEW
Daniel Tordjman, Richard M Hinds, Omri Ayalon, S Steven Yang, John T Capo
The volar Henry approach is most commonly used for surgical fixation of distal radius fractures. However, this approach is limited in achieving adequate exposure for the fixation of the volar-ulnar portion of the distal radius, rendering it difficult for the ideal placement of the fixation construct. We propose the use of the extensile volar-ulnar approach for fixation of distal radius fracture involving a small volar-ulnar fragment. This approach allows optimal reduction of the sigmoid notch and the volar lunate facet, which anatomically reduces both the radiocarpal joint and the sigmoid notch...
December 2016: Journal of Hand Surgery
https://www.readbyqxmd.com/read/27902167/arthroscopic-limited-intercarpal-fusion-without-bone-graft-in-patients-with-kienb%C3%A3-ck-s-disease
#10
Kadir Ertem, Gökay Görmeli, Mustafa Karakaplan, Okan Aslantürk, Yunus Karakoç
OBJECTIVES: This study aims to present our clinical results obtained in arthroscopic limited intercarpal fusion performed without using bone graft in patients with Kienböck's disease. PATIENTS AND METHODS: The study included 11 patients with Kienböck's disease (6 males, 5 females; mean age 28.9 years; range 14 to 51 years) who were performed arthroscopic lunate excision and scaphocapitate fusion between November 2012 and December 2013. Bain and Begg Arthroscopic Classification was used for the staging of Kienböck's disease...
December 2016: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/27890195/-carpal-malalignment-following-distal-radius-fracture
#11
B Coulet, M-O Gauci, C Lazerges, M Chammas
Adaptive carpal malalignment is the consequence of malunion of the distal radius. Since the radial metaphysis and capitate have to be aligned, any disorientation of the radial epiphysis will force the proximal carpal row to adapt, as it is the only mobile element. There are two types of adaptation depending where the compensative occurs: (1) midcarpal - leading to flexion between the lunate and capitate, with the lunate maintaining a normal relationship with the radial epiphysis axis; (2) radiocarpal - combining flexion and dorsal displacement of the lunate relative to the axis of the radial epiphysis, with the midcarpal joint remaining aligned...
December 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27856939/magnetic-resonance-imaging-investigation-of-radio-lunate-relations-use-in-assessing-distal-radial-fracture-reduction
#12
G Medlock, J M Wohlgemut, I M Stevenson, A J Johnstone
: Reformatted magnetic resonance imaging scans of 27 normal wrists were examined in incremental degrees of rotation around the central axis of the radial shaft to 30° in both directions from true lateral. A line was superimposed on the outer border of the radial dorsal cortex and continued distally to the carpal region. Measurements were made from the superior pole of the lunate to this line. This distance did not change significantly with rotation. This allows a quick and accurate way of assessing distal radial fracture reduction from poorly taken lateral radiographs...
November 16, 2016: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/27855045/-four-corner-fusion-in-patients-with-wrist-arthritis
#13
María Francisca Vázquez-Alonso, Alberto Viñas-Silva
Scapholunate advance collapse (SLAC) and Scaphoid nonunion advance collapse (SNAC), are the two most common patterns of postraumatic wrist arthritis. SLAC wrist develops after attenuation, either traumatically or atraumatically, of the scapholunate ligament. Atraumatic causes of SLAC wrist include calcium pyrophosphate dehydrate deposition disease, reumathoid arthritis, neuropathic diseases, and b2-microglobulin asociated amyloid deposition diseases. On the other hand, SNAC wrist develops following a scahpoid fracture that has progressed to a nonunion...
2016: Revista Médica del Instituto Mexicano del Seguro Social
https://www.readbyqxmd.com/read/27852021/-neuroanatomy-of-the-parietal-association-areas
#14
Yasushi Kobayashi
The parietal association cortex comprises the superior and inferior parietal lobules, the precuneus and the cortices in the intraparietal, parietooccipital and lunate sulci. By processing somatic, visual, acoustic and vestibular sensory information, the parietal association cortex plays a pivotal role in spatial cognition and motor control of the eyes and the extremities. Sensory information from the primary and secondary somatosensory areas enters the superior parietal lobule and is transferred to the inferior parietal lobule...
November 2016: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/27847848/a-slightly-dorsally-tilted-lunate-on-mri-can-be-considered-normal
#15
Anne-Carolin Döring, Celeste L Overbeek, Teun Teunis, Stéphanie J E Becker, David Ring
BACKGROUND: Abnormal angulation of the lunate can be an indication of intercarpal pathology. On magnetic resonance images (MRIs) the lunate often looks dorsally angulated, even in healthy wrists. The tilt on individual slices can also be different and might be misinterpreted as pathological, contributing to inaccurate diagnoses and unnecessary surgery. The primary aim of this study was to determine the average radiolunate angle on sagittal wrist MRI images as well as the radiolunate angle in the most radial, central and most ulnar part of the lunate; also the interobserver reliability was determined...
October 2016: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/27846305/time-to-decide-dynamical-analysis-predicts-partial-tip-stalk-patterning-states-arise-during-angiogenesis
#16
Lakshmi Venkatraman, Erzsébet Ravasz Regan, Katie Bentley
Angiogenesis is a highly dynamic morphogenesis process; however, surprisingly little is known about the timing of the different molecular processes involved. Although the role of the VEGF-notch-DLL4 signaling pathway has been established as essential for tip/stalk cell competition during sprouting, the speed and dynamic properties of the underlying process at the individual cell level has not been fully elucidated. In this study, using mathematical modeling we investigate how specific, biologically meaningful, local conditions around and within an individual cell can influence their unique tip/stalk phenotype switching kinetics...
2016: PloS One
https://www.readbyqxmd.com/read/27788281/locomotor-hand-postures-carpal-kinematics-during-wrist-extension-and-associated-morphology-in-anthropoid-primates
#17
Caley M Orr
The biomechanics of wrist extension (or dorsiflexion) are important for understanding functional adaptation of the primate hand because extension mobility varies with habitual locomotor hand posture and facilitates certain manipulative tasks. Here, intercarpal kinematics are employed to investigate mechanisms underlying wrist extension in a sample of anthropoids representing various arboreal and terrestrial locomotor modes. Carpal kinematics are studied using computed-tomography of cadaveric forelimbs, and these data are combined with a morphometric analysis of biomechanically-informative anatomical features...
October 27, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27782999/a-three-dimensional-micro-computed-tomographic-study-of-the-intraosseous-lunate-vasculature-implications-for-surgical-intervention-and-the-development-of-avascular-necrosis
#18
Nick A van Alphen, Mohamed Morsy, Alexis T Laungani, Assaf Kadar, Andrew J Vercnocke, Nirusha Lachman, Erik L Ritman, Steven L Moran
BACKGROUND: The purpose of this study was to use micro-computed tomography to demonstrate the intraosseous vascularity of the lunate within a three-dimensional orientation to identify areas of greatest perfusion and define vascular "safe zones" for surgical intervention. METHODS: Fourteen upper extremities were injected with a lead-based contrast agent. The lunates were harvested and scanned using a micro-computed tomography scanner. The intraosseous vascularity was incorporated into a three-dimensional image...
November 2016: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27781983/idiopathic-bilateral-lunate-and-triquetrum-avascular-necrosis-a-case-report
#19
L Amsallem, J Serane, D Zbili, B Marion, P Boyer
We report on the case of bilateral avascular osteonecrosis (AVN) of the lunate and triquetrum in a 45-year-old woman without any relevant medical history for which the cause could not be established. She was treated conservatively with splinting and analgesics. The patient was able to pursue her work and hobbies with subnormal range of motion at 1-year follow-up. AVN of the triquetrum is very rare, as it is a richly vascularized bone. The presence of AVN in multiple carpal bones has only been described in patients receiving high doses of corticosteroids...
October 2016: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/27777826/lunate-fragments-in-unstable-scaphoid-nonunion-wrists-affect-or-effect
#20
Paul W L Ten Berg, Mario Maas, Simon D Strackee
No abstract text is available yet for this article.
November 2016: Journal of Wrist Surgery
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