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Talar dome

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https://www.readbyqxmd.com/read/27923351/intra-and-inter-observer-reliability-of-a-new-standardized-diagnostic-method-using-spect-ct-in-patients-with-osteochondral-lesions-of-the-ankle-joint
#1
Geneviève Hassink, Enrique A Testa, André Leumann, Thomas Hügle, Helmut Rasch, Michael T Hirschmann
BACKGROUND: Single Photon Emission Computed Tomography-Computed Tomography (SPECT/CT) gains an important part of diagnostics in patients with osteochondral lesions (OCL). SPECT/CT is a hybrid imaging modality, which combines a 3D scintigraphy (SPECT) and computerized tomography (CT) into one single procedure and combines metabolic data, structural and mechanical information. The purpose of the study was to develop and evaluate a standardized method to anatomically localize and quantitatively analyze the bone SPECT tracer activity of the ankle joint using SPECT/CT...
December 7, 2016: BMC Medical Imaging
https://www.readbyqxmd.com/read/27871101/morphomics-of-the-talus
#2
David Gorman, Ebram Handy, Sikui Wang, Annette L Irwin, Stewart Wang
Previous studies of frontal crash databases reported that ankle fractures are among the most common lower extremity fractures. While not generally life threatening, these injuries can be debilitating. Laboratory research into the mechanisms of ankle fractures has linked dorsiflexion with an increased risk of tibia and fibula malleolus fractures. However, talus fractures were not produced in the laboratory tests and appear to be caused by more complex loading of the joint. In this study, an analysis of the National Automotive Sampling System - Crashworthiness Data System (NASS-CDS) for the years 2004-2013 was conducted to investigate foot-ankle injury rates in front seat occupants involved in frontal impact crashes...
November 2016: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/27726748/ct-and-mr-imaging-of-the-postoperative-ankle-and-foot
#3
Gary M LiMarzi, Kurt F Scherer, Michael L Richardson, David R Warden, Christopher W Wasyliw, Jack A Porrino, Christopher R Pettis, Gideon Lewis, Christopher C Mason, Laura W Bancroft
A variety of surgical procedures exist for repair of both traumatic and degenerative osseous and soft-tissue pathologic conditions involving the foot and ankle. It is necessary for the radiologist to be familiar with these surgical procedures, so as to assess structural integrity, evaluate for complicating features, and avoid diagnostic pitfalls. Adequate interpretation of postoperative changes often requires access to surgical documentation to evaluate not only the surgery itself but the expected timeline for resolution of normal postoperative changes versus progressive disease...
October 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/27658414/arthroscopic-surgical-technique-for-an-acute-talar-dome-osteochondral-lesion-in-a-professional-rugby-league-player
#4
Martin Sullivan, Ethan J Fraser, James Linklater, Craig Harris, Kieran Morgan
: Background Talar osteochondral lesions represent challenging clinical entities, particularly in high-demand athletes. Surgical treatment of large lesions often requires a 2-step procedure, or the use of osteotomy in the case of autologous osteochondral transfer, which can delay return to sport. Methods A professional rugby league player underwent surgery for a complex injury to the ankle. A talar osteochondral lesion with a maximal diameter of 15 mm was treated in an arthroscopic fashion using the cartilage taken from the completely displaced osteochondral fragment...
September 22, 2016: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/27599433/arthroscopic-anatomy-of-the-ankle-joint
#5
REVIEW
Ronald G Ray
There are a number of variations in the intra-articular anatomy of the ankle which should not be considered pathological under all circumstances. The anteromedial corner of the tibial plafond (between the anterior edge of the tibial plafond and the medial malleolus) can have a notch, void of cartilage and bone. This area can appear degenerative arthroscopically; it is actually a normal variant of the articular surface. The anterior inferior tibiofibular ligament (AITF) can possess a lower, accessory band which can impinge on the anterolateral edge of the talar dome...
October 2016: Clinics in Podiatric Medicine and Surgery
https://www.readbyqxmd.com/read/27589932/human-talar-and-femoral-cartilage-have-distinct-mechanical-properties-near-the-articular-surface
#6
Corinne R Henak, Keir A Ross, Edward D Bonnevie, Lisa A Fortier, Itai Cohen, John G Kennedy, Lawrence J Bonassar
Talar osteochondral lesions (OCL) frequently occur following injury. Surgical interventions such as femoral condyle allogeneic or autogenic osteochondral transplant (AOT) are often used to treat large talar OCL. Although AOT aims to achieve OCL repair by replacing damaged cartilage with mechanically matched cartilage, the spatially inhomogeneous material behavior of the talar dome and femoral donor sites have not been evaluated or compared. The objective of this study was to characterize the depth-dependent shear properties and friction behavior of human talar and donor-site femoral cartilage...
October 3, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27587373/compressive-force-with-2-screw-and-3-screw-subtalar-joint-arthrodesis-with-headless-compression-screws
#7
Takumi Matsumoto, Richard R Glisson, Markus Reidl, Mark E Easley
BACKGROUND: Joint compression is an essential element of successful arthrodesis. Although subtalar joint compression generated by conventional screws has been quantified in the laboratory, compression obtainable with headless screws that rely on variable thread pitch to achieve bony contact has not been assessed. This study measured subtalar joint compression achieved by 2 posteriorly placed contemporary headless, variable-pitch screws, and quantified additional compression gained by placing a third screw anteriorly...
December 2016: Foot & Ankle International
https://www.readbyqxmd.com/read/27502233/syndesmosis-preserving-osteotomy-of-the-fibula-for-access-to-the-lateral-talar-dome
#8
Kalpesh R Vaghela, Hans Clement, Lee Parker
BACKGROUND: Open surgical access to the postero-lateral talar dome for the treatment of osteochondral lesions is challenging, often requiring a segmental osteotomy of the fibula (fibular window) and division of the anterior inferior tibiofibular ligament (AITFL) or a fibular osteotomy with division of the AITFL and the anterior talofibular ligament (ATFL) (fibular door). Alternatively, to preserve the tibiofibular syndesmosis both the fibula and the lateral tibial plafond can be osteotomised to expose the entire lateral talar dome...
September 2016: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/27452921/talar-dome-detection-and-its-geometric-approximation-in-ct-sphere-cylinder-or-bi-truncated-cone
#9
Junbin Huang, He Liu, Defeng Wang, James F Griffith, Lin Shi
OBJECTIVE: The purpose of our study is to give a relatively objective definition of talar dome and its shape approximations to sphere (SPH), cylinder (CLD) and bi-truncated cone (BTC). MATERIALS AND METHODS: The "talar dome" is well-defined with the improved Dijkstra's algorithm, considering the Euclidean distance and surface curvature. The geometric similarity between talar dome and ideal shapes, namely SPH, CLD and BTC, is quantified. 50 unilateral CT datasets from 50 subjects with no pathological morphometry of tali were included in the experiments and statistical analyses were carried out based on the approximation error...
July 18, 2016: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/27362485/operative-technique-and-clinical-outcome-in-endoscopic-core-decompression-of-osteochondral-lesions-of-the-talus-a-pilot-study
#10
Sascha Beck, Tim Claßen, Marcel Haversath, Marcus Jäger, Stefan Landgraeber
BACKGROUND Revitalizing the necrotic subchondral bone and preserving the intact cartilage layer by retrograde drilling is the preferred option for treatment of undetached osteochondral lesions of the talus (OLT). We assessed the effectiveness of Endoscopic Core Decompression (ECD) in treatment of OLT. MATERIAL AND METHODS Seven patients with an undetached OLT of the medial talar dome underwent surgical treatment using an arthroscopically-guided transtalar drill meatus for core decompression of the lesion. Under endoscopic visualization the OLT was completely debrided while preserving the cartilage layer covering the defect...
2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27340258/posterior-to-anteriorly-directed-screws-for-management-of-talar-neck-fractures
#11
Michael J Beltran, Phillip M Mitchell, Cory A Collinge
BACKGROUND: Screws placed from posterior to anterior have been shown to be biomechanically and anatomically superior in the fixation of talar neck and neck-body fractures, yet most surgeons continue to place screws from an anterior start point. The safety and efficacy of percutaneously applied posterior screws has not been clinically defined, and functional outcomes after their use is lacking. METHODS: After institutional review board approval, we performed a retrospective review of 24 consecutive talar neck fractures treated by a single surgeon that utilized posterior-to-anterior screw fixation...
October 2016: Foot & Ankle International
https://www.readbyqxmd.com/read/27234650/the-effect-of-different-bone-marrow-stimulation-techniques-on-human-talar-subchondral-bone-a-micro-computed-tomography-evaluation
#12
Arianna L Gianakos, Youichi Yasui, Ethan J Fraser, Keir A Ross, Marcelo P Prado, Lisa A Fortier, John G Kennedy
PURPOSE: To evaluate morphological alterations, microarchitectural disturbances, and the extent of bone marrow access to the subchondral bone marrow compartment using micro-computed tomography analysis in different bone marrow stimulation (BMS) techniques. METHODS: Nine zones in a 3 × 3 grid pattern were assigned to 5 cadaveric talar dome articular surfaces. A 1.00-mm microfracture awl (s.MFX), a 2.00-mm standard microfracture awl (l.MFX), or a 1.25-mm Kirschner wire (K-wire) drill hole was used to penetrate the subchondral bone in each grid zone...
May 24, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27206975/additional-mesenchymal-stem-cell-injection-improves-the-outcomes-of-marrow-stimulation-combined-with-supramalleolar-osteotomy-in-varus-ankle-osteoarthritis-short-term-clinical-results-with-second-look-arthroscopic-evaluation
#13
Yong Sang Kim, Moses Lee, Yong Gon Koh
BACKGROUND: Supramalleolar osteotomy (SMO) is reported to be an effective treatment for varus ankle osteoarthritis by redistributing the load line within the ankle joint. Mesenchymal stem cells (MSCs) have been proposed as a new treatment option for osteoarthritis on the basis of their cartilage regeneration ability. The purpose of this study was to compare the clinical, radiological, and second-look arthroscopic outcomes between MSC injection with marrow stimulation and marrow stimulation alone in patients with varus ankle osteoarthritis who have undergone SMO...
December 2016: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/27177437/computer-modeling-analysis-of-the-talar-dome-as-a-graft-for-the-humeral-head
#14
Charles M Chan, Matthew R LeVasseur, Amy L Lerner, Michael D Maloney, Ilya Voloshin
PURPOSE: To study the degree of surface congruency between the talar dome and humeral head, to determine the size of graft harvestable from the talar dome, and to determine if there are surrogate markers that correspond to a higher degree of surface congruency. METHODS: Computer models of 7 nonmatched humeral heads and 7 talar domes were generated by digital segmentation of magnetic resonance (MR) images. Modeled defect regions of each humeral head were then aligned with medial and lateral surfaces of each talar dome using software to maximally limit surface mismatch...
August 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27050022/arthroscopic-talar-dome-access-using-a-standard%C3%A2-versus-wire-based-traction-method-for-ankle-joint-distraction
#15
Alexej Barg, Charles L Saltzman, Timothy C Beals, Kent N Bachus, Brad D Blankenhorn, Florian Nickisch
PURPOSE: To evaluate the accessibility of the talar dome through anterior and posterior portals for ankle arthroscopy with the standard noninvasive distraction versus wire-based longitudinal distraction using a tensioned wire placed transversely through the calcaneal tuberosity. METHODS: Seven matched pairs of thigh-to-foot specimens underwent ankle arthroscopy with 1 of 2 methods of distraction: a standard noninvasive strapping technique or a calcaneal tuberosity wire-based technique...
July 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27049198/role-of-fresh-osteochondral-allografts-for-large-talar-osteochondral-lesions
#16
Christopher E Gross, Samuel B Adams, Mark E Easley, James A Nunley
Osteochondral lesions of the talus, large or small, are challenging for the treating orthopaedic surgeon. These cartilage and bony defects can cause substantial pain and functional disability. Surgical treatment of small osteochondral lesions of the talus has been thoroughly explored and includes retrograde drilling, arthroscopic débridement and marrow stimulation, osteochondral autografting from cartilage/bone unit harvested from the ipsilateral knee (mosaicplasty), and autologous chondrocyte implantation...
2016: Instructional Course Lectures
https://www.readbyqxmd.com/read/26915781/secondary-reconstruction-for-malunions-and-nonunions-of-the-talar-body
#17
REVIEW
Hans Zwipp, Stefan Rammelt
Malunions and nonunions after central or peripheral fractures of the talar body frequently lead to pain and disability. In properly selected, compliant patients without symptomatic arthritis or total avascular necrosis leading to collapse of the talar dome, and sufficient bone stock, secondary anatomic reconstruction with osteotomy along the former fracture plane and preservation of the essential peritalar joints may lead to considerable functional improvement. Bone grafting is needed after resection of a fibrous pseudarthrosis, sclerotic, or necrotic bone...
March 2016: Foot and Ankle Clinics
https://www.readbyqxmd.com/read/26843547/computed-tomographic-evaluation-of-joint-geometry-in-patients-with-end-stage-ankle-osteoarthritis
#18
Martin Wiewiorski, Sebastian Hoechel, Andrew E Anderson, Andrej M Nowakowski, James K DeOrio, Mark E Easley, James A Nunley, Victor Valderrabano, Alexej Barg
BACKGROUND: Deformation of the talus and the distal tibia can be frequently observed during ankle joint osteoarthritis (OA). The aim of this study was to objectify these morphologic changes. We hypothesized that a flattening of the talus and a broadening of the distal tibia surface occurs in end-stage OA of the ankle joint. METHODS: Twenty-seven computed tomography (CT) ankle joint examinations of unilateral ankle OA were matched by sex and age with 27 CT examinations of healthy ankle joints...
June 2016: Foot & Ankle International
https://www.readbyqxmd.com/read/26689585/how-do-hindfoot-fusions-affect-ankle-biomechanics-a-cadaver-model
#19
Ian D Hutchinson, Josh R Baxter, Susannah Gilbert, MaCalus V Hogan, Jeff Ling, Stuart M Saunders, Hongsheng Wang, John G Kennedy
BACKGROUND: While successful subtalar joint arthrodesis provides pain relief, resultant alterations in ankle biomechanics need to be considered, as this procedure may predispose the remaining hindfoot and tibiotalar joint to accelerated degenerative changes. However, the biomechanical consequences of isolated subtalar joint arthrodesis and additive fusions of the Chopart's joints on tibiotalar joint biomechanics remain poorly understood. QUESTIONS/PURPOSES: We asked: What is the effect of isolated subtalar fusion and sequential Chopart's joint fusions of the talonavicular and calcaneocuboid joints on tibiotalar joint (1) mechanics and (2) kinematics during loading for neutral, inverted, and everted orientations of the foot? METHODS: We evaluated the total force, contact area, and the magnitude and distribution of the contact stress on the articular surface of the talar dome, while simultaneously tracking the position of the talus relative to the tibia during loading in seven fresh-frozen cadaver feet...
April 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/26633817/long-term-results-after-extensive-soft-tissue-release-in-very-severe-congenital-clubfeet
#20
Fanny Alkar, Djamel Louahem, Frédérique Bonnet, Karine Patte, Marion Delpont, Jérôme Cottalorda
BACKGROUND: The purpose of this study was to determine the long-term results, at an average follow-up of 22 years, in 66 patients (105 clubfeet) with very severe congenital idiopathic clubfeet according to the Dimeglio-Bensahel scale. METHODS: Patients were treated with an extensive soft tissue release in infancy. Results of the treatment were assessed according to the 100-point system of Ghanem-Seringe. At the latest follow-up, all participants were evaluated with regard to pain and the overall function of the lower extremities...
December 2, 2015: Journal of Pediatric Orthopedics
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