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https://www.readbyqxmd.com/read/27912929/survival-failure-modes-and-function-of-combined-distal-femur-and-proximal-tibia-reconstruction-following-tumor-resection
#1
F Sevelda, W Waldstein, J Panotopoulos, C Stihsen, A Kaider, P T Funovics, R Windhager
BACKGROUND: Tumor spread to the knee joint or skip metastasis to the adjacent bones of the knee require reconstruction with combined distal femur and proximal tibia replacements. The literature on implant survival and failure modes with this type of reconstruction is sparse. The goals of this study were to determine the implant survival, the different failure modes and the functional outcome of this megaendoprosthetic reconstruction. PATIENTS AND METHODS: Thirty-nine patients with combined distal femur and proximal tibia reconstruction were retrospectively reviewed...
November 23, 2016: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27910615/measurement-of-diagnostic-neutral-beam-parameters-on-j-text
#2
J R Wang, Z F Cheng, Z Li, Y Li, J Luo, X L Zhang, G Zhuang
A Doppler frequency shift spectrum (DFSS) system composed of two spectrometers has been developed for the joint Texas experimental tokamak to measure diagnostic neutral beam parameters including the beam energy fractions, intensity distributions, and divergences. The beam energy fractions are derived from measurements of H-alpha (Hα) emission using collisional excitation cross sections. The beam intensity distributions are obtained using an 11-channel measurement with a reconstruction technique. The beam divergences are obtained from spectrum broadening and geometric calculations...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910604/response-function-of-single-crystal-synthetic-diamond-detectors-to-1-4-mev-neutrons-for-spectroscopy-of-d-plasmas
#3
M Rebai, L Giacomelli, A Milocco, M Nocente, D Rigamonti, M Tardocchi, F Camera, C Cazzaniga, Z J Chen, T F Du, T S Fan, A Giaz, Z M Hu, T Marchi, X Y Peng, G Gorini
A Single-crystal Diamond (SD) detector prototype was installed at Joint European Torus (JET) in 2013 and the achieved results have shown its spectroscopic capability of measuring 2.5 MeV neutrons from deuterium plasmas. This paper presents measurements of the SD response function to monoenergetic neutrons, which is a key point for the development of a neutron spectrometer based on SDs and compares them with Monte Carlo simulations. The analysis procedure allows for a good reconstruction of the experimental results...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909667/arthroscopic-capsular-reconstruction-of-the-hip-with-acellular-dermal-extracellular-matrix-surgical-technique
#4
Itay Perets, David E Hartigan, John P Walsh, Edwin Chaharbakhshi, Mary R Close, Benjamin G Domb
Atraumatic instability of the hip has become an increasingly studied occurrence in recent years. There are several established surgical techniques that help restore stability of the native hip joint. In some cases, these procedures are not an option. As the phenomenon has become recognized more frequently, a greater number of revision surgeries are warranted in patients with ligamentous laxity. A durable solution for irreparable microinstability needs to be formulated to address this vulnerable patient demographic...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27909130/the-use-of-ultra-low-dose-ct-scans-for-the-evaluation-of-limb-fractures-is-the-reduced-effective-dose-using-ct-in-orthopaedic-injury-reduction-protocol-effective
#5
S R Konda, A M Goch, P Leucht, A Christiano, S Gyftopoulos, G Yoeli, K A Egol
AIMS: To evaluate whether an ultra-low-dose CT protocol can diagnose selected limb fractures as well as conventional CT (C-CT). PATIENTS AND METHODS: We prospectively studied 40 consecutive patients with a limb fracture in whom a CT scan was indicated. These were scanned using an ultra-low-dose CT Reduced Effective Dose Using Computed Tomography In Orthopaedic Injury (REDUCTION) protocol. Studies from 16 selected cases were compared with 16 C-CT scans matched for age, gender and type of fracture...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27908189/thermoacoustic-imaging-of-rabbit-knee-joints
#6
Zihui Chi, Yuan Zhao, Lin Huang, Zhu Zheng, Huabei Jiang
PURPOSE: Knee joint is one of the largest and most complex joints of the body. Knee joint diseases are common, and current clinical imaging technologies such as x-ray computed tomography, magnetic resonance imaging, and ultrasound imaging have limitations in the diagnosis of knee joint diseases. Emerging imaging technologies such as diffuse optical tomography and photoacoustic imaging (PAI) have been applied to the detection of osteoarthritis (OA). However, they are limited to small joints such as the finger and difficult to be used for large joints such as the knee...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908185/a-comparison-of-linear-interpolation-models-for-iterative-ct-reconstruction
#7
Katharina Hahn, Harald Schöndube, Karl Stierstorfer, Joachim Hornegger, Frédéric Noo
PURPOSE: Recent reports indicate that model-based iterative reconstruction methods may improve image quality in computed tomography (CT). One difficulty with these methods is the number of options available to implement them, including the selection of the forward projection model and the penalty term. Currently, the literature is fairly scarce in terms of guidance regarding this selection step, whereas these options impact image quality. Here, the authors investigate the merits of three forward projection models that rely on linear interpolation: the distance-driven method, Joseph's method, and the bilinear method...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908174/respiratory-motion-compensation-for-simultaneous-pet-mr-based-on-highly-undersampled-mr-data
#8
Christopher M Rank, Thorsten Heußer, Andreas Wetscherek, Martin T Freitag, Oliver Sedlaczek, Heinz-Peter Schlemmer, Marc Kachelrieß
PURPOSE: Positron emission tomography (PET) of the thorax region is impaired by respiratory patient motion. To account for motion, the authors propose a new method for PET/magnetic resonance (MR) respiratory motion compensation (MoCo), which uses highly undersampled MR data with acquisition times as short as 1 min/bed. METHODS: The proposed PET/MR MoCo method (4D jMoCo PET) uses radial MR data to estimate the respiratory patient motion employing MR joint motion estimation and image reconstruction with temporal median filtering...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27908172/design-of-a-dual-resolution-collimator-for-preclinical-cardiac-spect-with-a-stationary-triple-detector-system
#9
Stephen C Moore, Mi-Ae Park, Zhe Liu, Morgan C Lyon, Lindsay C Johnson, Victor H Lushear, James G Westberg, Scott D Metzler
PURPOSE: One approach to preclinical single-photon emission computed tomography (SPECT) imaging that provides both high resolution and high sensitivity is based on imaging a mouse inside a collimating tube; many magnified pinhole projection images from a small target region, e.g., the heart, can be recorded simultaneously on multiple detectors with little multiplexing since each pinhole aperture's opening angle is restricted to view mostly the target organ. However, to obtain complete data for reconstruction, it may be necessary to scan the mouse through the target region of the tube...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907934/restriction-of-postoperative-joint-loading-in-a-murine-model-of-anterior-cruciate-ligament-reconstruction-botulinum-toxin-paralysis-and-external-fixation
#10
Amir Lebaschi, Xiang-Hua Deng, Nathan W Coleman, Christopher L Camp, Jianchun Zong, Andrew Carbone, Camila B Carballo, Guang-Ting Cong, Zoe M Album, Scott A Rodeo
Control of knee motion in small animal models is necessary to study the effect of mechanical load on the healing process. This can be especially challenging in mice, which are being increasingly used for various orthopedic reconstruction models. We explored the feasibility of botulinum toxin (Botox; Allergan, Dublin, Ireland) paralysis and a newly designed external fixator to restrict motion of the knee in mice undergoing anterior cruciate ligament (ACL) reconstruction. Nineteen C57BL/6 mice were allocated to two groups: (1) Botox group (n = 9) and (2) external fixator group (n = 10)...
December 1, 2016: Journal of Knee Surgery
https://www.readbyqxmd.com/read/27906096/biological-and-functional-evaluation-of-a-novel-pyrolytic-carbon-implant-for-the-treatment-of-focal-osteochondral-defects-in-the-medial-femoral-condyle-assessment-in-a-canine-model
#11
Samantha L Salkeld, Laura P Patron, Joan C Lien, Stephen D Cook, Deryk G Jones
BACKGROUND: Osteochondral defects continue to be a clinical treatment challenge, and when left untreated, may cause pain and functional impairment. Pyrolytic carbon is a unique isotropic biomaterial used in heart valve and small joint replacements due to its excellent wear properties and biocompatibility with bone and articular cartilage. Therefore, a proposed solution is to utilize a focal pyrolytic carbon hemiarthroplasty implant as an alternative resurfacing treatment strategy for isolated cartilage lesions...
December 1, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27902174/total-patellectomy-for-patellar-aneurysmal-bone-cyst
#12
Mehmet Çetinkaya, Hamza Özer, Hakan Y Selek, Selim Erekul
Herein we report a case of patellar aneurysmal bone cyst of a 32-year-old female patient who was admitted to our outpatient clinic due to the swelling on her left knee. She was describing no trauma history but increasing pain and that the mass was expanding gradually by the time. Although it occurs rarely in patella, evaluation by radiographic and magnetic resonance images revealed that the mass was due to the patellar aneurysmal bone cyst, which also destructed the surface of the joint. Although there was no impairment in the range of motion of the patient's left knee in the preoperative evaluation, because of the destruction, we performed total patellectomy and extensor mechanism reconstruction by Zaricznyj technique instead of curettage and grafting...
December 2016: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/27901645/fenestrated-adipofascial-reverse-flap-a-modified-technique-for-the-reconstruction-of-fingertip-amputations
#13
Francesco Idone, Andrea Sisti, Juri Tassinari, Giuseppe Nisi
AIMS OF THE STUDY: Fingertip injuries can be treated in different ways, including shortening with primary closure, skin graft, and local or distant flaps. Several local flaps for the reconstruction of the amputated fingertip were described. We present our experience with a new concept of homodigital adipofascial reverse flap that avoids the second surgical stage and allows a complete and anatomically perfect reconstruction of nail bed, with preservation of the nail lamina. MATERIALS AND METHODS: Between March 2014 and February 2015, five patients with digital amputations (distally to the nail matrix) were treated using the Fenestrated Adipofascial Reverse (F...
November 30, 2016: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/27900339/an-ecological-study-of-anterior-cruciate-ligament-reconstruction-part-1-clinical-tests-do-not-correlate-with-return-to-sport-outcomes
#14
Timothy M McGrath, Gordon Waddington, Jennie M Scarvell, Nick Ball, Rob Creer, Kevin Woods, Damian Smith, Roger Adams
BACKGROUND: Additional high-quality prospective studies are needed to better define the objective criteria used in relation to return-to-sport decisions after synthetic (ligament advanced reinforcement system [LARS]) and autograft (hamstring tendon [2ST/2GR]) anterior cruciate ligament (ACL) reconstruction in active populations. PURPOSE: To prospectively investigate and describe the recovery of objective clinical outcomes after autograft (2ST/2GR) and synthetic (LARS) ACL reconstructions, as well as to investigate the relationship between these clinimetric test outcomes and return-to-sport activity (Tegner activity scale [TAS] score) at 12 and 24 months postoperatively...
November 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27900338/the-bridge-enhanced-anterior-cruciate-ligament-repair-bear-procedure-an-early-feasibility-cohort-study
#15
Martha M Murray, Brett M Flutie, Leslie A Kalish, Kirsten Ecklund, Braden C Fleming, Benedikt L Proffen, Lyle J Micheli
BACKGROUND: This study assessed the safety of the newly developed bridge-enhanced anterior cruciate ligament (ACL) repair (BEAR), which involves suture repair of the ligament combined with a bioactive scaffold to bridge the gap between the torn ligament ends. As the intra-articular environment is complex in its response to implanted materials, this study was designed to determine whether there would be a significant rate of adverse reaction to the implanted scaffold. HYPOTHESIS: The primary hypothesis was that the implanted scaffold would not result in a deep joint infection (arthrocentesis with positive culture) or significant inflammation (clinical symptoms justifying arthrocentesis but negative culture)...
November 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27900307/arthroscopic-fixation-of-coronoid-process-fractures-through-coronoid-tunnelling-and-capsular-plication
#16
Paolo Arrigoni, Riccardo D'Ambrosi, Davide Cucchi, Simone Nicoletti, Enrico Guerra
PURPOSE: the purpose of this study is to describe a new arthroscopic technique for reduction and fixation of coronoid process fractures (CPFs) and report clinical and functional results in 4 patients after a 24-month follow-up. METHODS: four patients underwent arthroscopic reduction and fixation of isolated CPFs (acute or non-unions, type I or type II according to the Regan-Morrey classification) performed using a new technique based on coronoid tunnelling and capsular plication...
July 2016: Joints
https://www.readbyqxmd.com/read/27899355/the-anatomic-centers-of-the-femoral-and-tibial-insertions-of-the-anterior-cruciate-ligament-a-systematic-review-of-imaging-and-cadaveric-studies-reporting-normal-center-locations
#17
Anagha P Parkar, Miraude E A P M Adriaensen, Søren Vindfeld, Eirik Solheim
BACKGROUND: The anterior cruciate ligament (ACL) is regularly reconstructed if knee joint function is impaired. Anatomic graft tunnel placement, often assessed with varying measurement methods, in the femur and tibia is considered important for an optimal clinical outcome. A consensus on the exact location of the femoral and tibial footprint centers is lacking. PURPOSE: To systematically review the literature regarding anatomic centers of the femoral and tibial ACL footprints and assess the mean, median, and percentiles of normal centers...
November 29, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27896678/no-clinically-important-difference-in-knee-scores-or-instability-between-transtibial-and-inlay-techniques-for-pcl-reconstruction-a-systematic-review
#18
REVIEW
Young-Soo Shin, Hyun-Jung Kim, Dae-Hee Lee
BACKGROUND: It is unclear whether the biomechanical superiority of the inlay technique over the transtibial technique, arising from avoidance of the killer turn at the graft-tunnel margin of the proximal tibia during posterior cruciate ligament (PCL) reconstruction, leads to better knee scores or greater knee stability. QUESTIONS/PURPOSES: This systematic review was designed to compare Tegner and Lysholm scores, and posterior residual laxity of the knee, between single-bundle PCL reconstruction using transtibial and inlay techniques...
November 28, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27896394/the-orientation-of-the-surgical-epicondylar-axis-varies-in-varus-and-non-varus-knees-in-the-coronal-plane
#19
Yunjie Zhang, Xiaofeng Wang, Yunchao Shao, Qing Xia
PURPOSE: To investigate the orientations of the surgical epicondylar axis (SEA) of varus and non-varus knees in the coronal plane. METHODS: One-hundred and sixty-two knees from 81 Chinese patients undergoing total knee arthroplasty (TKA) were retrospectively investigated. The angle between the medial side of the femoral mechanical axis and the SEA (MA-SEA), as well as the physiological valgus angle, was measured in the coronal plane using three-dimensional reconstruction...
November 28, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27896015/development-of-a-multi-wavelength-diffuse-optical-tomography-system-for-early-diagnosis-of-rheumatoid-arthritis-simulation-phantoms-and-healthy-human-studies
#20
Hao Yang Wu, Andrew Filer, Iain Styles, Hamid Dehghani
A multi-wavelength diffuse optical tomography (DOT) system has been developed to directly extract physiological information, such as total haemoglobin concentration, from tissue in human hand joints. Novel methods for 3D surface imaging and spectrally constrained image reconstruction are introduced and their potential application to imaging of rheumatoid arthritis is discussed. Results are presented from simulation studies as well as experiments using phantoms and data from imaging of three healthy volunteers...
November 1, 2016: Biomedical Optics Express
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