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https://www.readbyqxmd.com/read/28107235/an-experimental-biomechanical-study-on-artificial-atlantoodontoid-joint-replacement-in-dogs
#1
Quanjin Zang, Yanming Liu, Dengfeng Wang, Haopeng Li, Pinglin Yang, Dong Wang, Xijing He
STUDY DESIGN: This study tested the biomechanics of artificial atlantoodontoid joint replacement (AAOJR) in a dog model. Dogs were divided into the artificial AAOJR group (n=10), the decompression group (n=10), and the healthy control group (n=10) using a random number table. OBJECTIVE: To evaluate whether the use of AAOJR for repair of atlantoaxial instability retains rotation and restores stability. SUMMARY OF BACKGROUND DATA: Atlantoaxial instability is characterized by excessive movement or laxity at the junction between the atlas (C1) and axis (C2)...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28092739/an-emg-driven-biomechanical-model-of-the-canine-cervical-spine
#2
M Alizadeh, G G Knapik, J S Dufour, C Zindl, M J Allen, J Bertran, N Fitzpatrick, W S Marras
Due to the frequency of cervical spine injuries in canines, the purpose of this effort was to develop an EMG-driven dynamic model of the canine cervical spine to assess a biomechanical understanding that enables one to investigate the risk of neck disorders. A canine subject was recruited in this investigation in order to collect subject specific data. Reflective markers and a motion capture system were used for kinematic measurement; surface electrodes were used to record electromyography signals, and with the aid of force plate kinetics were recorded...
December 26, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28087764/accumulation-of-polyribosomes-in-dendritic-spine-heads-but-not-bases-and-necks-during-memory-consolidation-depends-on-cap-dependent-translation-initiation
#3
Linnaea E Ostroff, Benjamin Botsford, Sofya Gindina, Kiriana K Cowansage, Joseph E LeDoux, Eric Klann, Charles Hoeffer
: Translation in dendrites is believed to support synaptic changes during memory consolidation. Although translational control mechanisms are fundamental mediators of memory, little is known about their role in local translation. We previously found that polyribosomes accumulate in dendritic spines of the adult rat lateral amygdala (LA) during consolidation of aversive Pavlovian conditioning, and that this memory requires cap-dependent initiation, a primary point of translational control in eukaryotic cells...
January 13, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28074785/deformable-registration-of-ct-and-cone-beam-ct-with-local-intensity-matching
#4
Seyoun Park, William Plishker, Harry Quon, John Wong, Raj Shekhar, Junghoon Lee
Cone-beam CT (CBCT) is a widely used intra-operative imaging modality in image-guided radiotherapy and surgery. A short scan followed by a filtered-backprojection is typically used for CBCT reconstruction. While data on the mid-plane (plane of source-detector rotation) is complete, off-mid-planes undergo different information deficiency and the computed reconstructions are approximate. This causes different reconstruction artifacts at off-mid-planes depending on slice locations, and therefore impedes accurate registration between CT and CBCT...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28073583/clinical-factors-associated-with-subclinical-spread-of-in-situ-melanoma
#5
Thuzar M Shin, Jeremy R Etzkorn, Joseph F Sobanko, David J Margolis, Joel M Gelfand, Emily Y Chu, Rosalie Elenitsas, Waqas R Shaikh, Christopher J Miller
BACKGROUND: Subclinical spread of in situ melanoma occurs at a wide frequency, ranging from 12% to 71%. OBJECTIVE: To identify clinical factors associated with subclinical spread of in situ melanoma. METHODS: We used a retrospective, cross-sectional study of 674 consecutive in situ melanomas to examine 627 patients treated with Mohs surgery and melanoma antigen recognized by T cells 1 immunostaining. The presence of subclinical spread was correlated with clinical characteristics...
January 7, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28067972/single-innervated-segmented-vastus-lateralis-for-midfacial-reanimation-during-radical-parotidectomy
#6
Lauren Sh Chong, Timothy J Eviston, Bruce Ashford, Ardalan Ebrahami, Jonathan R Clark
BACKGROUND: Innervated free muscle transfer using the gracilis muscle or temporalis myoplasty has been successfully utilized for facial reanimation in chronic facial palsy. These techniques are less suited to immediate facial reconstruction in the setting of radical parotidectomy, in which the complexity of the defect, patient age, postoperative radiotherapy, and limited life expectancy pose particular challenges. METHODS: We present a novel description of the use of a chimeric anterolateral thigh (ALT) flap and innervated vastus lateralis to achieve midface static suspension and dynamic reanimation in the setting of radical parotidectomy...
January 9, 2017: Head & Neck
https://www.readbyqxmd.com/read/28065626/choosing-a-femoral-head-a-survey-study-of-academic-adult-reconstructive-surgeons
#7
Sumon Nandi, Matthew S Austin
BACKGROUND: Our aim was to examine how academic adult reconstructive surgeons have interpreted evidence on femoral head material in total hip arthroplasty (THA). METHODS: A 16-question survey to evaluate attitudes toward ceramic and cobalt-chrome head use was emailed to 274 faculty at 42 US adult reconstruction fellowship programs. RESULTS: With 116 respondents, the response rate was 42.2%. Faculty use ceramic heads 72.9% of the time. The most common reason why respondents do not use ceramic heads is cost (44...
December 18, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28064382/early-assessment-of-feasibility-and-technical-specificities-of-transoral-robotic-surgery-using-the-da-vinci-xi
#8
Philippe Gorphe, Jean Von Tan, Sophie El Bedoui, Dana M Hartl, Anne Auperin, Quentin Qassemyar, Antoine Moya-Plana, François Janot, Morbize Julieron, Stephane Temam
The latest generation Da Vinci(®) Xi™ Surgical System Robot released has not been evaluated to date in transoral surgery for head and neck cancers. We report here the 1-year results of a non-randomized phase II multicentric prospective trial aimed at assessing its feasibility and technical specificities. Our primary objective was to evaluate the feasibility of transoral robotic surgery using the da Vinci(®) Xi™ Surgical System Robot. The secondary objective was to assess peroperative outcomes. Twenty-seven patients, mean age 62...
January 7, 2017: Journal of Robotic Surgery
https://www.readbyqxmd.com/read/28063278/combined-anterolateral-thigh-and-tensor-fasciae-latae-flaps-an-option-for-reconstruction-of-large-head-and-neck-defects
#9
Ramzey Tursun, Hisham Marwan, J Marshall Green, Fawaz Alotaibi, Andre LeDoux
PURPOSE: The advent of microvascular free tissue transfer has provided the reconstructive surgeon with an enormous array of treatment options for reconstruction of large head and neck defects. However, when indicated by defect size, the need for more than 1 flap not only increases surgical complexity but also patient morbidity. The combination of the anterolateral thigh (ALT) flap and the tensor fascia latae (TFL) flap can be used to reconstruct such complex head and neck defects, thereby minimizing any additional morbidity that would be imposed by an additional flap harvest site...
December 26, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28063274/morbidity-and-functional-outcomes-with-head-and-neck-free-flap-reconstruction-in-patients-aged-90%C3%A2-years-or-older
#10
Adam P Fagin, Savannah Gelesko, Mark K Wax, Daniel Petrisor
PURPOSE: Morbidity of free tissue transfer in the extremes of age is controversial and not well studied in patients aged 90 years or older because of the rarity of these patients and many clinicians' natural hesitancy to perform such a large operation in patients of this group. The purpose of this study was to answer the following clinical question: Do patients aged 90 years or older who undergo free flap reconstruction have worse functional outcomes than their younger counterparts? MATERIALS AND METHODS: We performed a retrospective chart review of patients aged 90 years or older who underwent free flap reconstruction at Oregon Health and Science University Hospital from 2000 to 2015...
December 18, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28062176/characteristics-and-surgical-management-of-flap-compromise-caused-by-thrombosis-of-the-internal-jugular-vein
#11
Bin Yang, Yi Qu, Ming Su, Jinzhong Li, Hua Li, Rudong Xing, Zhengxue Han
BACKGROUND: A principal reason for flap compromise in oral and maxillofacial head and neck surgery, and failure of a free flap transfer, is thrombosis of a drainage vein such as the internal jugular vein. This study characterized flap compromise caused by internal jugular vein thrombosis after a free flap transfer, and its management. PATIENTS AND METHODS: A retrospective clinical study was conducted of 306 consecutive microvascular free flaps performed for 305 patients with head and neck cancer from March 2003 to March 2013 at the Department of Oral and Maxillofacial Surgery at Beijing Stomatological Hospital, Capital Medical University...
December 18, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28062122/airflow-behavior-changes-in-upper-airway-caused-by-different-head-and-neck-positions-comparison-by-computational-fluid-dynamics
#12
Wei Wei, Shi-Wei Huang, Lian-Hua Chen, Yang Qi, Yi-Min Qiu, Shi-Tong Li
The feasibility of computational fluid dynamics (CFD) to evaluate airflow characteristics in different head and neck positions has not been established. This study compared the changes in volume and airflow behavior of the upper airway by CFD simulation to predict the influence of anatomical and physiological airway changes due to different head-neck positions on mechanical ventilation. One awake volunteer with no risk of difficult airway underwent computed tomography in neutral position, extension position (both head and neck extended), and sniffing position (head extended and neck flexed)...
December 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28061548/suprafascial-harvest-of-the-radial-forearm-free-flap-decreases-the-risk-of-postoperative-tendon-exposure
#13
David C Shonka, Nikita V Kohli, Benjamin M Milam, Mark J Jameson
OBJECTIVE: To determine if suprafascial harvest of the radial forearm free flap improves postoperative donor site outcomes compared to subfascial harvest. METHODS: Retrospective chart review. RESULTS: Forty-six patients underwent reconstruction of a head and neck defect with a radial forearm free flap (RFFF). Subfascial harvest of the RFFF was performed in 25 (53%) patients and suprafascial harvest performed in 22 (47%) patients. All donor sites were covered with a split thickness skin graft and a bolster that remained in place for 6 days...
January 1, 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28061519/does-a-standalone-cancer-center-improve-head-and-neck-microsurgical-outcomes
#14
Matthew L Tamplen, Jesse Tamplen, Vanessa Torrecillas, Rahul Seth, Santo Ricceri, Shirin Hemmat, Chase Heaton, William R Ryan, P Daniel Knott
Objectives To evaluate the role of hospital setting (standalone cancer center vs. large multidisciplinary hospital) on free tissue transfer (FTT) outcomes for head and neck reconstruction. Methods Medical records were reviewed of 180 consecutive patients undergoing FTT for head and neck reconstruction. Operations occurred at either a standalone academic cancer center (n = 101) or a large multidisciplinary academic medical center (n = 79) by the same surgeons. Patient outcomes, operative comparisons, and hospital costs were compared between the hospital settings...
January 6, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28061517/supraclavicular-flap-reconstruction-of-cutaneous-defects-has-lower-complication-rate-than-mucosal-defects
#15
Sameep Kadakia, Jay Agarwal, Moustafa Mourad, Sara Ashai, Thomas Lee, Yadranko Ducic
Background The objective of this study was to determine whether there was a difference in complication rate between cutaneous and mucosal defects reconstructed with the supraclavicular artery flap. Methods Retrospective review of postoperative complications in 63 patients from 2008 to 2015 with cutaneous and mucosal head and neck defects following oncologic ablation reconstructed with the supraclavicular flap, with a minimum follow-up duration of 6 months. Of the 63 patients, 38 patients had cutaneous defects, whereas 25 had mucosal defects...
January 6, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28060533/morphological-distribution-of-the-anterior-inferior-iliac-spine-in-patients-with-and-without-hip-impingement
#16
George C Balazs, Benjamin C Williams, Christopher M Knaus, Daniel I Brooks, Jonathan F Dickens, Michael P McCabe, Terrence D Anderson
BACKGROUND: Subspinous impingement of the anterior inferior iliac spine (AIIS) on the femoral head-neck junction is increasingly recognized as a source of hip impingement. A classification system of AIIS morphology has previously been proposed that correlates with reduced hip motion and may predispose patients to subspinous hip impingement. PURPOSE: To examine the morphological distribution of AIIS types in patients with and without diagnosed hip impingement and correlate AIIS morphology to intraoperative findings at the time of surgery...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28056483/complex-orofacial-reconstruction-with-the-intrinsic-chimeric-flap
#17
Andrés A Maldonado, Amanda K Silva, Laura S Humphries, Lawrence J Gottlieb
Background Ablation of locally advanced or recurrent head and neck cancer often results in large composite orofacial defects with limited recipient vessels. These complex defects lend well to intrinsic chimeric flap reconstruction, which allows greater ability to inset various flap component tissue types than composite flaps and requires only one set of microvascular anastomoses. Methods A retrospective chart review was performed on all patients who underwent orofacial reconstruction with an intrinsic chimeric free flap from 2002 to 2015...
January 5, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28056334/immediate-microsurgical-bone-and-nerve-reconstruction-in-the-irradiation-treated-patient-a-case-report
#18
Ramzey Tursun, J Marshall Green
Microsurgical reconstructive techniques have revolutionized the treatment of large head and neck defects. These defects were once forever life altering because of the considerable morbidity to both the form and function of the patient. As time has progressed, microsurgical technique has improved dramatically and has become institutionalized in our training programs. Free flap outcomes in head and neck reconstruction have improved dramatically, and optimization of these outcomes is now key. One overlooked area has been neurosensory reconstruction...
December 11, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28050062/reliability-of-the-pectoralis-major-myocutaneous-flap-in-reconstructive-oral-cancer-surgery-in-developing-countries-our-experience
#19
Atanu Bhanja, D S J D'Souza, Collin Roy, R N Poddar
BACKGROUND: Although free flaps are nowadays considered 'Gold standard' of head and neck reconstruction, pectoralis major myocutaneous (PMMC) flap is still popular among many reconstructive cancer surgeons in developing countries for its many advantages and also due to lack of resources for free flaps in most of the centers, large number of cancer patients with poor nutritional status and economic condition. However, many studies have reported high complication rate in PMMC flap. So, the purpose of our study was to evaluate the reliability of PMMC flap...
December 2016: Medical Journal, Armed Forces India
https://www.readbyqxmd.com/read/28048590/we-ab-brb-03-real-time-volumetric-scintillation-dosimetry-for-radiation-therapy
#20
S Beddar
: Despite widespread IMRT treatments at modern radiation therapy clinics, precise dosimetric commissioning of an IMRT system remains a challenge. In the most recent report from the Radiological Physics Center (RPC), nearly 20% of institutions failed an end-to-end test with an anthropomorphic head and neck phantom, a test that has rather lenient dose difference and distance-to-agreement criteria of 7% and 4 mm. The RPC report provides strong evidence that IMRT implementation is prone to error and that improved quality assurance tools are required...
June 2016: Medical Physics
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