8,230 results match your criteria technical note

Technical note: Estimating original crown height in worn mandibular canines using aspects of dentin morphology.

Am J Phys Anthropol 2021 Aug 4. Epub 2021 Aug 4.

Skeletal Biology Research Centre, School of Anthropology and Conservation, University of Kent, Canterbury, Kent, United Kingdom.

We present a novel method to estimate original crown height (OCH) for worn human mandibular canines using a cubic regression equation based on ratios of worn crown height and exposed dentin. This method may help alleviate issues frequently presented by worn teeth in dental analyses, including those in bioarchaeology. Mandibular canines (n = 28) from modern day New Zealand and English populations were selected. Read More

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Skin erosion in deep brain stimulation procedures: Using the temporalis muscle to treat this complication - A technical note.

Surg Neurol Int 2021 19;12:355. Epub 2021 Jul 19.

Department of Neurology, Division of Neurology, Catholic Pontifical University of Sorocaba, Sorocaba, Brazil.

Background: Skin erosion is a common complication after deep brain stimulator procedures. Despite being a relatively common event, there is no standard surgical technique or a widely accepted guideline for managing this kind of complication.

Methods: We describe a case of cutaneous erosion in the connector's site of deep brain stimulation case, surgically managed with anterior displacement of the connectors and overlapping and wrapping the connections within the temporal muscle. Read More

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Remarkable shrinkage of a thrombosed giant aneurysm by stent-assisted jam-packed coil embolization.

Surg Neurol Int 2021 6;12:328. Epub 2021 Jul 6.

Department of Neurosurgery Nara Medical University, Kashihara, Nara, Japan.

Background: Large and giant aneurysms are known to involve intra-aneurysmal thrombosis and present a poor prognosis because of compression of the surrounding brain tissue with enlargement of the aneurysm. These aneurysms are difficult to cure by endovascular treatment due to involvement of the vasa vasorum in their pathology. We report this technical note to describe stent-assisted jam-packed coil embolization for the treatment of a giant thrombosed aneurysm. Read More

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Technical note: Managing occupational doses with smartphones in interventional radiology.

Med Phys 2021 Aug 3. Epub 2021 Aug 3.

Medical Physics, Hospital Clínico San Carlos, 28040, Madrid, Spain.

Purpose: This study presents a prototype smartphone application for occupational dosimetry in interventional practices based on electronic personal dosimeters to assist in dose monitoring.

Methods: The prototype receives and records information from the Occupational Dose Report containing the cumulative dose of electronic personal dosimeters worn over the apron at chest level and electronic area dosimeters located on C-arms (reference dosimeters), for each fluoroscopy-guided procedure. Using their smartphones, personnel involved in interventional practices can review and compare their occupational records with an investigation level, the dose limits and their department colleagues (anonymously). Read More

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Nodal tumor volume as a prognostic factor for head and neck squamous cell carcinoma: a systematic review.

Front Biosci (Landmark Ed) 2021 Jul;26(7):235-245

1st Department of Otolaryngology - Head & Neck Surgery, Medical School, National & Kapodistrian University of Athens (NKUA), Hippokrateio Hospital, 11527 Athens, Greece.

: Several studies suggest that there is an association between the metastatic nodal tumor volume and the clinical outcome in patients with solid cancers. However, despite the prognostic potential of nodal volume, a standardized method for estimating the nodal volumetric parameters is lacking. Herein, we conducted a systematic review of the published scientific literature towards investigating the prognostic value of nodal volume in the carcinomas of head and neck, taking into consideration the primary tumor site and the human papillomavirus (HPV) status. Read More

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Transmucosal posterior segmentation in the context of minimally invasive Le Fort I osteotomy: technical note.

J Stomatol Oral Maxillofac Surg 2021 Jul 30. Epub 2021 Jul 30.

Institute of Maxillofacial Surgery, Teknon Medical Center, Barcelona, Spain; Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain.

In patients in which posterior segmentation of the maxilla is planned in the context of a minimally invasive Le Fort I osteotomy, accessing the posterior segmentation may tear the soft tissues, causing the minimally invasive approach to become lost, and tissue vascularization may be jeopardized. A technical note is presented for maintaining the original incision length when posterior osteotomies are required in the context of a minimally invasive Le Fort I osteotomy. Two vertical incisions are performed at the level of the premolars, a subperiosteal tunnel is made to access the bone with the piezoelectric device, and then an osteotome is used to complete the osteotomy. Read More

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Navigability of a long sheath in the lateral dural sinuses facilitated by the pilot balloon technique: technical note.

Neuroradiology 2021 Aug 2. Epub 2021 Aug 2.

Department of Neuroradiology, Lariboisière Hospital, AP-HP, 2, rue Ambroise Paré, 75010, Paris, France.

Dural sinus stenting is an increasingly recognized intervention for the treatment of lateral sinus stenosis. This procedure can be challenging in tortuous anatomy and in the presence of intraluminal septa because of poor trackability and crossability of long sheath commonly used for stenting. We report a technique using a pilot angioplasty balloon positioned at the distal end of the long sheath that improves its navigability in dural sinuses and facilitated the intervention. Read More

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Elbow Ulnar Collateral Ligament Shoelace Repair with Internal Bracing for Treating Throwing Athletes Who Have Ulnar Collateral Ligament Instability.

Arthrosc Tech 2021 Jul 20;10(7):e1873-e1878. Epub 2021 Jun 20.

Department of Orthopaedic Surgery, University of Occupational and Environmental Health, Fukuoka, Japan.

This Technical Note aimed to present a surgical technique of ulnar collateral ligament (UCL) shoelace repair using suture anchors and double suture tapes in combination with internal bracing to correct UCL instability along with epiphyseal avulsion of the medial epicondyle in throwing athletes Skeletally immature throwing athletes playing baseball and softball are at a risk of sustaining medial epicondyle epiphyseal separation that can result in UCL instability, predisposing to elbow UCL disruption later. There are several surgical techniques that can restore elbow UCL function and stability. In cases where large fragments of the medial epicondyle are present in skeletally immature athletes, the residual bony fragment and the shortened, chronically injured UCL make surgical treatment quite challenging. Read More

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Harvest, Transport, and Storage of Fresh Humeral Head Osteochondral Allograft: Step-by-Step Protocol.

Arthrosc Tech 2021 Jul 20;10(7):e1805-e1813. Epub 2021 Jun 20.

Divisão de Ensino e Pesquisa, Instituto Nacional de Traumatologia e Ortopedia Jamil Haddad, São Cristóvão, Brazil.

Articular cartilage defects are not common in the glenohumeral joint and are mostly found in patients after shoulder trauma, in patients with recurrent instability, or in patients who underwent previous surgical treatment. Articular cartilage defects lead to pain and loss of motion, consequently causing shoulder function impairment and reducing quality of life. In young patients, the use of osteochondral allografts for the treatment of humeral head defects may avoid well-known complications of shoulder arthroplasty. Read More

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All-Inside Arthroscopic Meniscal Stacked Suture Repair for Hypermobile Lateral Meniscus With FASTFIX 360.

Arthrosc Tech 2021 Jul 20;10(7):e1757-e1761. Epub 2021 Jun 20.

Department of Orthopaedic Surgery, School of Medicine, Jichi Medical University, Shimotsuke.

Even though inside-out repair of meniscal tears is still the gold standard, the need for a posterior incision is a certain disadvantage of this approach. However, all-inside arthroscopic meniscal stacked suture repair can be performed for hypermobile lateral meniscus using all-inside devices and slotted canula. This technique is able not only to reduce surgical invasion but also preserve meniscal mobility, since sutures are placed on the peripheral area of the lateral meniscus. Read More

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Hybrid Remnant-Sparing Anterior Cruciate Ligament Repair-Reconstruction.

Arthrosc Tech 2021 Jul 20;10(7):e1717-e1721. Epub 2021 Jun 20.

Department of Orthopaedic Surgery, Henry Ford Hospital, Detroit, Michigan, U.S.A.

In anterior cruciate ligament (ACL) reconstruction, the remnant ACL is often debrided in an effort to improve visualization of patient anatomy and reduce surgical difficulty. However, retention of the tibial remnant of a torn ACL theoretically portends several advantages. These include preservation of knee proprioception and mechanoreceptors, an enhanced biological environment for healing, and accelerated revascularization and ligamentization of the graft. Read More

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Management of an Internal Carotid Artery Injury During Open Skull Base Surgery With a Crushed Muscle Patch - Technical Note and Lessons Learned.

Oper Neurosurg (Hagerstown) 2021 Jul 31. Epub 2021 Jul 31.

Neurosurgery Department, Flinders Medical Centre, Bedford Park, Australia.

Background: Iatrogenic internal carotid artery (ICA) injury is a catastrophic complication in open skull base surgery. There is a lack of information regarding the most appropriate techniques on how to manage this complication.

Objective: To highlight the difficulties encountered when an ICA injury arises intraoperatively and discuss the role and the potential pitfalls of the crushed muscle patch in the management of an ICA injury during open skull base surgery. Read More

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Implementation of six degree-of-freedom high-precision robotic phantom on commercial industrial robotic manipulator.

Biomed Phys Eng Express 2021 Jul 30. Epub 2021 Jul 30.

Department of Radiation Oncology, Yamaguchi University School of Medicine Graduate School of Medicine, 1 Chome-1-1 Minamikogushi, Ube-city, Ube, Yamaguchi, 755-8505, JAPAN.

This technical note discloses our implementation of a six degree-of-freedom (DOF) high-precision robotic phantom on a commercially available industrial robot manipulator. These manipulators are designed to optimize their set point tracking accuracy as it is the most important performance metric for industrial manipulators. Their in-house controllers are tuned to suppress its error less than a few tens of micrometers. Read More

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The surgical challenge of ossified ventrolateral spinal meningiomas: tricks and pearls for managing large ossified meningiomas of the thoracic spine.

J Neurosurg Spine 2021 Jul 30:1-11. Epub 2021 Jul 30.

The authors present an illustrative technical note on microsurgical resection of ventrolateral completely ossified spinal meningiomas (OSMs) and a literature review of the surgical management of calcified spinal meningiomas or OSMs. These tumors are surgically demanding due to their solid consistency, especially when in a ventrolateral location with dislocation of the spinal cord. A challenging case with significant thoracic cord compression and displacement is described. Read More

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A novel instrument for the prevention of condylar torque in bilateral sagittal ramus osteotomy when using bicortical screw fixation.

Int J Oral Maxillofac Surg 2021 Jul 26. Epub 2021 Jul 26.

Department of Cranio-Maxillofacial Surgery, ZMACK, AZ Monica Antwerpen, Antwerp, Belgium; All for Research vzw, Antwerp, Belgium; Department of Cranio-Maxillofacial Surgery, Antwerp University Hospital, Edegem, Belgium; Faculty of Medicine and Health Sciences, University of Antwerp, Campus Drie Eiken, Antwerp, Belgium. Electronic address:

When using the bilateral sagittal split osteotomy (BSSO) technique, rigid internal fixation (RIF) remains the standard method to accurately fix the distal and proximal osteotomy fragments. A concern with the use of RIF, especially with bicortical screws, is the increased risk of condylar torque and its functional consequences. This technical note introduces a new method for preventing torque of the mandibular condyles after BSSO, using a sagittal split space maintainer. Read More

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Toe-First Technique for End to Side Microvascular Anastomosis - A Technical Note.

World Neurosurg 2021 Jul 26. Epub 2021 Jul 26.

Professor, Neurosurgery, National Institute of Mental Health and Neurosciences, Bangalore, India. Electronic address:

Introduction: The use of the classic two-ends anchoring technique is common in end-to side (ES) microvascular anastomosis. The literature on the Toe-first (TF) technique is limited. In the current study we present the successful outcomes with the TF technique in ES anastomoses in rat femoral vessels model. Read More

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Stereotactic biopsy for lesions in brainstem and deep brain: a single-center experience of 72 cases.

Braz J Med Biol Res 2021 23;54(8):e11335. Epub 2021 Jul 23.

Department of Neurology, the Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong, China.

Stereotactic biopsies for lesions in the brainstem and deep brain are rare. This study aimed to summarize our 6-year experience in the accurate diagnosis of lesions in the brain stem and deep brain and to discuss the technical note and strategies. From December 2011 to January 2018, 72 cases of intracranial lesions in the brainstem or deep in the lobes undergoing stereotactic biopsy were retrospectively reviewed. Read More

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Combined utility of one lung ventilation and artificial pneumothorax in thermal ablation of hepatic dome tumor: a technical note.

Diagn Interv Radiol 2021 Jul;27(4):564-566

Department of Anesthesiology, Singapore General Hospital, Singapore.

Radiofrequency ablation and microwave ablation are established treatment modalities for smaller (<3 cm) or isolated hepatic tumors. Transthoracic ablation of hepatic dome lesions is a well described technique. We report the use of one lung ventilation to facilitate the successful percutaneous transthoracic microwave ablation of a segment 8 hepatic dome lesion after induction of artificial pneumothorax. Read More

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C-C Cross-couplings from a Cyclometalated Au(III) C^N complex: Mechanistic Insights and Synthetic Developments.

Chemistry 2021 Jul 26. Epub 2021 Jul 26.

Technische Universitat Munchen, Chemistry, Lichtenbergstr. 4, 85748, Garching, GERMANY.

In recent years, the reactivity of gold complexes was shown to extend well beyond  p -activation and to holds promises to achieve selective cross-couplings in several C-C and C-E (E = heteroatom) bond forming reactions. Here, with the aim of exploiting new organometallic species for cross-coupling reactions, we report on the Au(III)-mediated C(sp 2 )-C(sp) occurring upon reaction of the cyclometalated complex [Au(C CH2 N)Cl 2 ] (1, C CH2 N = 2-benzylpyridine) with AgPhCC. The reaction progress has been monitored by NMR spectroscopy, demonstrating the involvement of a number of key intermediates, whose structures have been unambiguously ascertained  via  1D and 2D NMR analyses as well as by HR-ESI-MS and X-ray diffraction studies. Read More

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Technical note: On the impact of the kV imaging configuration on doses from planar images during motion-synchronized treatments on Radixact®.

J Appl Clin Med Phys 2021 Jul 26. Epub 2021 Jul 26.

Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Kilovoltage radiographs are acquired during motion-synchronized treatments on Radixact to localize the tumor during the treatment. Several previous publications have provided estimates of patient dose from these planar radiographs. However, a recent hardware update changed several aspects of the kV imaging system, including a new X-ray tube, an extended source-to-axis distance (SAD), and a larger field size. Read More

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Technical note: Impact of face covering on aerosol transport patterns during coughing and sneezing.

J Aerosol Sci 2021 Nov 15;158:105847. Epub 2021 Jul 15.

Center for Health-Related Aerosol Studies, College of Medicine, University of Cincinnati, Cincinnati, OH, USA.

COVID-19 is spread via different routes, including virus-laden airborne particles generated by human respiratory activities. In addition to large droplets, coughing and sneezing produce a lot of small aerosol particles. While face coverings are believed to reduce the aerosol transmission, information about their outward effectiveness is limited. Read More

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November 2021

AGR2-dependent nuclear import of RNA polymerase II constitutes a specific target of pancreatic ductal adenocarcinoma in the context of wild-type p53.

Gastroenterology 2021 Jul 22. Epub 2021 Jul 22.

Department of Gastroenterology, the Affiliated Drum Tower Hospital of Nanjing University, Medical School, Nanjing, China; Department of Surgery, Ulm University Hospital, Ulm University, Ulm, Germany. Electronic address:

Background And Aim: Promoted by pancreatitis, oncogenic Kras triggers acinar cells' neoplastic transformation through acinar-to-ductal metaplasia (ADM) and pancreatic intraepithelial neoplasia (PanIN). Agr2 (anterior gradient 2), a known inhibitor of p53, is detected at early stage of pancreatic ductal adenocarcinoma (PDAC) development. RNA polymerase II (RNAPII) is a key nuclear enzyme; regulation of its nuclear localization in mammalian cells represents a potential therapeutic target. Read More

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Improved access to the bone marrow space by multiple perforations of the alveolar bundle bone after tooth extraction-A case report.

Clin Exp Dent Res 2021 Jul 23. Epub 2021 Jul 23.

Division of Oral Surgery, University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria.

Objectives: The dental alveolus is lined by a thin cortical layer ("bundle bone", "alveolar bone proper", "cribriform plate", "lamina dura"), that can impede access to the bone marrow and its vasculature. During unassisted socket healing, the alveolar bundle bone is gradually resorbed allowing tissue resources from the bone marrow to enter into the socket space. An optimized wound healing process, either during unassisted socket healing or during ridge preservation procedures, with autogenous bone and/or any bone/collagen substitute material, depends at least partly on an adequate vascularization of the socket space. Read More

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Technical note: rectangular femoral tunnel for anterior cruciate ligament reconstruction using a new ultrasonic device: a feasibility study.

J Exp Orthop 2021 Jul 22;8(1):53. Epub 2021 Jul 22.

Department of Orthopaedic Surgery, Centre Hospitalier de Luxembourg-Clinique D'Eich, 78 Rue d'Eich, 1460, Luxembourg, Luxembourg.

Purpose: The goal of this preliminary report was to show the use of novel Ultrasound (US) technology for anterior cruciate ligament (ACL) reconstruction surgery and evaluate its feasibility for the creation of a rectangular femoral bone tunnel during an arthroscopic procedure in a human cadaver model.

Methods: Two fresh frozen human cadaver knees were prepared for arthroscopic rectangular femoral tunnel completion using a prototype US device (OLYMPUS EUROPA SE & CO. KG). Read More

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Intrathecal morphine injection in anterior lumbar and lateral lumbar spine surgery: technical note.

J Spine Surg 2021 Jun;7(2):204-207

Nepean Medical School, University of Sydney, Penrith, NSW, Australia.

Intrathecal morphine (ITM) is routinely used in many surgical specialties as an adjunct to postoperative analgesia. Patients undergoing lumbar spinal surgery commonly experience early postoperative pain. There have been multiple reports of the benefits of ITM in lumbar spine surgery where it has been shown to significantly reduce the need for intravenous opioid analgesia, improve time to mobilization, and shorten length of hospital stay. Read More

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Intraoperative disc level marking with needle: a technical note and prospective study on 30 patients.

J Spine Surg 2021 Jun;7(2):190-196

Clinic La Source, Neuro Orthopedic Center, Lausanne, Switzerland.

Background: Wrong-level surgery is a rare but unresolved issue in spine surgery. Some proposed protocols with high success rates, but it remains a risk with potential complications for the patient. Surgical navigation offers more accurate surgery, without additional irradiation related to the imaging device, in order to optimize the surgical guidance. Read More

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Technical Note: Comparison of Convolutional Neural Networks for Detecting Large Vessel Occlusion on Computed Tomography Angiography.

Med Phys 2021 Jul 21. Epub 2021 Jul 21.

Department of Computer Science, Vanderbilt University, Nashville, TN, 37235, USA.

Purpose: Artificial intelligence diagnosis and triage of large vessel occlusion may quicken clinical response for a subset of time-sensitive acute ischemic stroke patients, improving outcomes. Differences in architectural elements within data-driven convolutional neural network (CNN) models impact performance. Foreknowledge of effective model architectural elements for domain-specific problems can narrow the search for candidate models and inform strategic model design and adaptation to optimize performance on available data. Read More

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A sensor to monitor limb depth in transtibial sockets with locking pin suspension: a technical note.

Prosthet Orthot Int 2021 Jul 19. Epub 2021 Jul 19.

Department of Bioengineering, University of Washington, Seattle, WA, USA.

Background: Monitoring of limb depth in transtibial sockets may provide useful information toward patient education and care.

Objective: The objective was to develop a sensor to detect the depth of a locking pin in the shuttle lock of a transtibial socket and to monitor the small motions between ratchet clicks during ambulation.

Study Design: Controlled bench testing and single-participant study. Read More

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Pew: Open-Source Imaging Software for Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry.

Anal Chem 2021 Aug 20;93(30):10418-10423. Epub 2021 Jul 20.

The Atomic Medicine Initiative, University of Technology Sydney, Ultimo, New South Wales 2007, Australia.

Open-sourced software is a key component of the mass spectrometry imaging field, where transparency in data processing is vital. Imaging of trace elements and immunohistochemically labeled biomolecules in tissue sections is typically performed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). However, efficient and facile processing of images is hampered by a lack of verifiable and user-friendly software that supports multiple LA-ICP-MS platforms. Read More

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Anterior epidural carbon dioxide dissection during spine cryoablation.

Jpn J Radiol 2021 Jul 19. Epub 2021 Jul 19.

Department of Diagnostic and Interventional Radiology, Hôpital Foch, 40 rue Worth, 92150, Suresnes, France.

Purpose: Spine cryoablation (SC) of posterior vertebral lesions exposes to neuronal damages and incomplete treatment due to the proximity of the spinal canal. Carbon dioxide (CO) dissection is a nerve protective method that can be used during spine cryoablation that tends to distribute in non-dependent areas. The purpose of this technical note was to expose the feasibility of anterior epidural CO dissection during SC in prone decubitus. Read More

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