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https://www.readbyqxmd.com/read/28087396/influence-of-coronal-bowing-on-the-lower-alignment-and-the-positioning-of-component-in-navigation-and-conventional-total-knee-arthroplasty
#1
Hideo Kobayashi, Yasushi Akamatsu, Ken Kumagai, Yoshihiro Kusayama, Masato Aratake, Tomoyuki Saito
BACKGROUND: Coronal alignment is an important factor for the function and longevity of total knee arthroplasty (TKA). Coronal bowing of the lower extremity is common among Asians and it may pose a risk for malalignment of the lower leg and malposition of component. HYPOTHESIS: We hypothesized that coronal bowing itself has a risk for malalignment of the lower leg and malposition of femoral / tibial components and that navigation TKA is beneficial for patients with coronal bowing...
January 10, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28072705/posterior-only-vertebral-column-resection-for-revision-surgery-in-post-laminectomy-rotokyphoscoliosis-associated-with-late-onset-paraplegia-a-case-report-and-literature-review
#2
Youping Tao, Jigong Wu, Huasong Ma
RATIONALE: Severe post-laminectomy spinal deformity associated with late-onset paraplegia is a complex and rare disorder. Little is known about revision surgery in post-laminectomy rotokyphoscoliosis associated with late-onset paraplegia treated by the single stage posterior-only vertebral column resection (VCR) procedure. PATIENT CONCERNS AND DIAGNOSES: The patient was a 14-year-old male diagnosed as post-laminectomy rotokyphoscoliosis associated with late-onset paraplegia...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28061515/spacer-based-gap-balancing-in-total-knee-arthroplasty-clinical-success-with-a-reproducible-technique
#3
Frédéric Lavoie
Purpose Proper coronal and transverse ligament balancing is an important aspect of total knee arthroplasty (TKA) and has an impact on postoperative outcome. Many variations of the gap balancing technique were described to address this challenge, most of them using various tensioning devices, but none for which the use is widespread. The aim of this paper is to describe a gap technique variant for TKA using spacer blocks and report the clinical results for a cohort of patients on which it was used. Methods A total of 114 TKAs were performed in 101 patients using a standardized surgical technique that integrates ligament balancing with sizing and positioning of the femoral component...
January 6, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28053391/a-prospective-study-to-evaluate-the-clinico-radiological-outcomes-of-arthroscopic-single-bundle-versus-double-bundle-anterior-cruciate-ligament-reconstruction
#4
Ashish Devgan, Rajesh Rohilla, Amanpreet Singh, Milind Tanwar, Radhika Devgan, Karan Siwach
INTRODUCTION: The aim of the study was to compare clinical and radiological outcomes of arthroscopic single-bundle versus double-bundle anterior cruciate ligament (ACL) reconstruction. PATIENT AND METHODS: 60 patients with isolated ACL injury were divided into single bundle (SB) (n = 30) and double bundle (DB) reconstruction groups (n = 30) and operated between July 2009 and July 2012. Outcome evaluation was performed using GNRB arthrometer, International Knee Documentation Committee & Lysholm scale...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28053258/ankle-joint-pressure-changes-in-high-tibial-and-distal-femoral-osteotomies-a-cadaver-study
#5
F Krause, A Barandun, G Klammer, I Zderic, B Gueorguiev, T Schmid
AIMS: To assess the effect of high tibial and distal femoral osteotomies (HTO and DFO) on the pressure characteristics of the ankle joint. MATERIALS AND METHODS: Varus and valgus malalignment of the knee was simulated in human cadaver full-length legs. Testing included four measurements: baseline malalignment, 5° and 10° re-aligning osteotomy, and control baseline malalignment. For HTO, testing was rerun with the subtalar joint fixed. In order to represent half body weight, a 300 N force was applied onto the femoral head...
January 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28050819/preventing-fusion-mass-shift-avoids-postoperative-distal-curve-adding-on-in-adolescent-idiopathic-scoliosis
#6
Hideki Shigematsu, Jason Pui Yin Cheung, Mauro Bruzzone, Hiroaki Matsumori, Kin-Cheung Mak, Dino Samartzis, Keith Dip Kei Luk
BACKGROUND: Surgery for adolescent idiopathic scoliosis (AIS) is only complete after achieving fusion to maintain the correction obtained intraoperatively. The instrumented or fused segments can be referred to as the "fusion mass". In patients with AIS, the ideal fusion mass strategy has been established based on fulcrum-bending radiographs for main thoracic curves. Ideally, the fusion mass should achieve parallel endplates of the upper and lower instrumented vertebra and correct any "shift" for truncal balance...
January 3, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28050471/spectrum-of-mdct-findings-in-bowel-obstruction-in-a-tertiary-care-rural-hospital-in-northern-india
#7
Ranjana Gupta, Puneet Mittal, Amit Mittal, Sharad Gupta, Kapish Mittal, Arpit Taneja
INTRODUCTION: Multidetector Computed Tomography (MDCT) provides clinically and surgically important information in bowel obstruction. It can depict the severity, level and cause of obstruction. AIM: To depict the spectrum of MDCT findings in cases of small and large bowel obstruction. MATERIALS AND METHODS: Contrast enhanced MDCT examination of 50 patients were retrospectively included in the study who had evidence of clinical as well as MDCT evidence of bowel obstruction and in whom surgical/clinical follow-up for final diagnosis was available...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28048851/su-f-t-61-treatment-planning-observations-for-the-civasheet-directional-brachytherapy-device-using-variseed-9-0
#8
M J Rivard, D J Rothley
PURPOSE: The VariSeed 9.0 brachytherapy TPS is recently available and has new features such as ability to rotate a brachytherapy source away from normal to the imaging plane. Consequently, a dosimetric analysis was performed for a directional brachytherapy source (CivaSheet) with tests of this functionality and experiences from clinical treatment planning were documented. These observations contribute to safe, practical, and accurate use of such new software features. METHODS: Several tests were established to evaluate the new rotational feature, specific to the CivaSheet for the first patients treated using this new brachytherapy device...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048583/su-f-t-503-trajectory-modulated-arc-therapy-of-intracranial-lesions-development-of-a-standardized-path-based-technique-for-fully-dynamic-couch-gantry-modulated-treatments
#9
S Khan, E Chin, K Otto, L Xing, D Hristov, B Fahimian
PURPOSE: The integration of couch motion during arc delivery is necessitated to enable irradiation trajectories such as coronal arcs, and to enhance the geometrical sampling for dynamic deliveries to the highest extent. To enable such capability, a platform of Trajectory Modulated Arc Therapy (TMAT) is developed in conjunction with standardized noncollisional dynamic path-set for irradiation of intracranial lesions. METHODS: A generalized path-set was constructed through the combination of sagittal arcs (45 degrees from the CAX), axial arcs, and coronal arcs produced through modulation of the dynamic rotation of couch...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048323/su-d-207a-05-investigating-sparse-sampled-mri-for-motion-management-in-thoracic-radiotherapy
#10
P Sabouri, T Arai, A Sawant
PURPOSE: Sparse sampling and reconstruction-based MRI techniques represent an attractive strategy to achieve sufficiently high image acquisition speed while maintaining image quality for the task of radiotherapy guidance. In this study, we examine rapid dynamic MRI using a sparse sampling sequence k-t BLAST in capturing motion-induced, cycle-to-cycle variations in tumor position. We investigate the utility of long-term MRI-based motion monitoring as a means of better characterizing respiration-induced tumor motion compared to a single-cycle 4DCT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047650/th-ef-bra-09-direct-comparison-of-t2-based-respiratory-correlated-4dmri-reconstructed-from-simultaneous-internal-navigator-and-external-bellows
#11
G Li, D Olek, J Wei, M Kadbi, N Tyagi, K Zakian, J Mechalakos, J Deasy, M Hunt
PURPOSE: To optimize T2-based respiratory-correlated 4DMRI for motion simulation, we evaluated the image quality after 4D reconstruction based on the two respiratory surrogates acquired independently and concurrently during the same breathing period. METHODS: Both internal navigator and external bellows were employed simultaneously during a 4DMRI acquisition on seven volunteers scanned coronally and sagittally under an IRB-approved protocol. The navigator was positioned at the right diaphragm dome while the bellows was placed at the upper abdomen...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047460/su-f-j-143-initial-assessment-of-image-quality-of-an-integrated-mr-linac-system-with-acr-phantom
#12
J Wang, J Yung, M Kadbi, Y Ding, C Fuller, G Ibbott
PURPOSE/OBJECTIVE(S): To assess the image quality of an integrated MR-Linac system and compare with other MRI systems that are primarily used for diagnostic purposes. MATERIALS/METHODS: An ACR MRI quality control (QC) phantom was used to evaluate the image quality of a fully integrated 1.5T MRI-Linac system recently installed at our institution. This system has a new split magnet design which gives the magnetic field strength of 1.5T. All images were acquired with a set of phased-array surface coils which are designed to have minimal attention of radiation beam...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046749/su-g-iep1-01-a-novel-mri-post-processing-algorithm-for-visualization-of-the-prostate-ldr-brachytherapy-seeds-and-calcifications-based-on-b0-field-inhomogeneity-correction-and-hough-transform
#13
R Nosrati, A Soliman, A Owrangi, N Ghugre, G Morton, A Pejovic-Milic, W Song
PURPOSE: This study aims at developing an MRI-only workflow for post-implant dosimetry of the prostate LDR brachytherapy seeds. The specific goal here is to develop a post-processing algorithm to produce positive contrast for the seeds and prostatic calcifications and differentiate between them on MR images. METHODS: An agar-based phantom incorporating four dummy seeds (I-125) and five calcifications of different sizes (from sheep cortical bone) was constructed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046381/su-f-t-436-a-method-to-evaluate-dosimetric-properties-of-sfgrt-in-eclipse-tps
#14
M Xu, J Wei, R Tobias, J Dick, S Crawford, J Swanson, M Pankuch
PURPOSE: The objective was to develop a method for dose distribution calculation of spatially-fractionated-GRID-radiotherapy (SFGRT) in Eclipse treatment-planning-system (TPS). METHODS: Patient treatment-plans with SFGRT for bulky tumors were generated in Varian Eclipse version11. A virtual structure based on the GRID pattern was created and registered to a patient CT image dataset. The virtual GRID structure was positioned on the iso-center level together with matching beam geometries to simulate a commercially available GRID block made of brass...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28043749/an-anatomic-analysis-of-mid-anterior-and-anterolateral-approaches-for-hip-arthrocentesis-a%C3%A2-male-cadaveric-study
#15
Jacob D Mikula, Jason M Schon, Chase S Dean, Jorge Chahla, Renato Locks, Alex W Brady, Robert F LaPrade, Marc J Philippon
PURPOSE: To determine the accuracy and safety of non-image-guided modified mid-anterior and anterolateral approaches to the hip joint for arthrocentesis. METHODS: Six pairs (n = 12) of human cadaveric hemipelvises underwent methylene blue hip injections through either a mid-anterior or an anterolateral approach. The distance from the mid-anterior approach to the lateral femoral cutaneous nerve (LFCN) was measured. Needle orientation was defined by a combination of 2 angles, calculated by the computer software analysis of digitized points...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28034610/anterior-tibial-artery-pseudoaneurysm-due-to-interlocking-bolt-of-tibial-nail-a-case-report-and-review
#16
Nitesh Gahlot, Rajendra Kumar Kanojia
Vascular injuries associated with the tibial nailing have been reported in few case reports. We here report a unique case of anterior tibial artery (ATA) pseudoaneurysm caused by the second proximal coronal interlocking bolt. We found that the position of interlocking bolts on the nail brings them very close to the anatomical positions of arteries in leg. The reports of ATA injury by interlocking bolts highlight the need for reconsidering the nail design and screw hole positions.
December 26, 2016: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28033151/spinal-realignment-for-adult-deformity-three-column-osteotomies-alter-total-hip-acetabular-component-positioning
#17
Jeffrey J Barry, Altug Yucekul, Alexander A Theologis, Erik N Hansen, Christopher Ames, Vedat Deviren
INTRODUCTION: A goal of adult spinal deformity surgery is correction of sagittal imbalance by increasing lumbar lordosis (LL), allowing a previously retroverted pelvis to normalize as evidenced by decreases in pelvic tilt (PT). Realignment of pelvic orientation may alter the position of preexisting total hip arthroplasties (THAs). METHODS: Twenty-seven patients with unilateral THA who underwent thoracolumbar fusions for adult spinal deformity from the pelvis to L1 or above were retrospectively reviewed (levels fused, 10...
December 28, 2016: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/28029578/stemmed-tibial-revision-component-alignment-does-an-anatomic-conflict-exist
#18
Kevin M Smith, Andrew Moorman, Sabir K Ismaily, Stephen J Incavo
INTRODUCTION: Obtaining satisfactory coronal plane alignment is important for success in revision total knee arthroplasty (TKA). The study objective was to determine tibial coronal plane alignment after TKA when a tibial stem was used and assess if there was an anatomic conflict in tibial stemmed component alignment. MATERIALS AND METHODS: A radiographic review of 88 revision TKA cases was performed. Full length leg radiographs were examined for varus/valgus alignment, defined as greater than or equal to three degrees from neutral 180 degrees, canal or non-canal filling tibial stems, and any native tibial bow...
October 29, 2016: Knee
https://www.readbyqxmd.com/read/28028644/preliminary%C3%A2-application-of-a-multi-level-3d-printing-drill-guide-template-for-pedicle-screw-placement-in-severe-and-rigid-scoliosis
#19
Kun Liu, Qiang Zhang, Xin Li, Changsong Zhao, Xuemin Quan, Rugang Zhao, Zongfeng Chen, Yansheng Li
PURPOSE: Accurate implantation of pedicle screw in spinal deformity correction surgeries is always challenging. We have developed a method of pedicle screw placement in severe and rigid scoliosis with a multi-level 3D printing drill guide template. METHODS: From November 2011 to March 2015, ten patients (4 males and 6 females) with severe and rigid scoliosis (Cobb angle >70° and flexibility <30%)were included. Multi-level template was designed and manufactured according to the part (two or three levels) of the most severe deformity...
December 27, 2016: European Spine Journal
https://www.readbyqxmd.com/read/28024789/quantitative-evaluation-of-maxillary-alveolar-cortical-bone-thickness-and-density-using-computed-tomography-imaging
#20
Henry Ohiomoba, Andrew Sonis, Alfa Yansane, Bernard Friedland
INTRODUCTION: Primary stability is essential to the success of orthodontic mini-implants (OMIs) and heavily depends on the mechanical retention between OMIs and their supporting bone. Alveolar cortical bone commonly serves as the supporting bone for OMIs during treatment. The purposes of this study were to characterize alveolar cortical bone thickness and density in the maxilla and to explore patient factors that may significantly affect these bone properties. METHODS: Sixty medical computed tomography scans of the maxilla were analyzed from a selected sample of patients seen at the Radiology Department of Boston Children's Hospital...
January 2017: American Journal of Orthodontics and Dentofacial Orthopedics
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