106,760 results match your criteria posterior anterior

Sperm ultrastructure of Ruditapes variegata and Tapes literatus (Mollusca, Bivalvia, Veneridae, Tapetinae) from Pescadores, Taiwan.

Tissue Cell 2021 Jun 10;71:101575. Epub 2021 Jun 10.

Department of Life Science, National University of Kaohsiung, Kaohsiung, Taiwan.

In the present study, we have investigated the ultrastructures of the mature gonadal spermatozoa of R. variegata and T. literatus and presented comparisons with the Manila clam, R. Read More

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Optic nerve mobilization as an alternative to anterior clinoidectomy in superior carotid-ophthalmic aneurysms: Operative technique.

World Neurosurg 2021 Jun 12. Epub 2021 Jun 12.

Department of Neurosurgery, Padilla Hospital, Tucumán, Argentina.

Background: Carotid-ophthalmic aneurysms arise from the internal carotid artery between the distal dural ring and the origin of the posterior communicating artery. The surgical treatment of these aneurysms usually requires an anterior clinoidectomy. However, this procedure is not without complications. Read More

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Salvage Oblique Lateral Interbody Fusion for Pseudarthrosis after Posterior/Transforaminal Lumbar Interbody Fusion: A Technical Note.

World Neurosurg 2021 Jun 12. Epub 2021 Jun 12.

Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.

Objective: This study aims to demonstrate the efficacy of salvage oblique lumbar interbody fusion (OLIF) surgery for pseudarthrosis after posterior/transforaminal lumbar interbody fusion (PLIF/TLIF).

Methods: The subjects consist of the patients with leg or back pain induced by pseudarthrosis after PLIF/TLIF. These patients underwent salvage OLIF surgeries in our institutions between Jul 2015 to Oct 2019. Read More

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Co-occurrence of Pituitary Neuroendocrine Tumors (PitNETs) and Tumors of the Neurohypophysis.

Endocr Pathol 2021 Jun 15. Epub 2021 Jun 15.

Department of Neurosurgery, Johannes Wesling Klinikum, University Hospital of the Ruhr-University Bochum (RUB), Hans-Nolte-Straße 1, D-32427, Minden, Germany.

Between 1996 and 2020, 12,565 cases were enrolled in the German Registry of Pituitary Tumors including 10,084 PitNETs (10,067 adenomas and 19 carcinomas obtained surgically and 193 adenomas diagnosed at autopsy) as well as 69 spindle cell tumors of the neurohypophysis (64 surgical specimens and 5 autopsies). In six patients (1 post mortem and 5 surgical specimens), PitNETs as well as posterior lobe tumors were found in the specimens. Two of the PitNETs were sparsely granulated prolactin-producing tumors, combined in one case with a granular cell tumor and in one case with a pituicytoma. Read More

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A comparative of a single novice surgeon's direct anterior approach and posterior approach learning curves in total hip arthroplasty: a retrospective cohort study.

Eur J Orthop Surg Traumatol 2021 Jun 15. Epub 2021 Jun 15.

Hip Surgery Unit, Orthopaedic Surgery Department, Vall d'Hebron University Hospital, Universitat Autónoma de Barcelona Departament de Cirurgia, Pg. Vall d'Hebron 119-129, 08035, Barcelona, Spain.

Introduction: The purpose of the present study was to compare a novice surgeon's learning curves with the direct anterior approach and posterior approach in total hip arthroplasty.

Methods: A consecutive series of 376 total hip arthroplasties performed from November 2014 to September 2019 in a level-one healthcare center by a single surgeon (V.B) were retrospectively studied. Read More

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Which radiograph is most accurate for assessing hip joint penetration in infra-acetabular screw placement?

Medicine (Baltimore) 2021 Jun;100(24):e26392

Department of Orthopedic Surgery, Korea University Guro Hospital, Korea University Medical Center, Seoul, Republic of Korea.

Abstract: Although infra-acetabular screws have been used for anterior and posterior column transfixation, a screw penetrating the hip joint can result in harmful complications. However, the most accurate intraoperative radiologic imaging tool for identifying articular penetration has not been established. The purpose of the present study was, therefore, to evaluate the consistency with which standard pelvic radiographs compared with computed tomography (CT) can be used for demonstrating articular penetration. Read More

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Can robotic technology mitigate the learning curve of total hip arthroplasty?

Bone Jt Open 2021 Jun;2(6):365-370

Department of Orthopaedic Surgery, Ochsner Clinic Foundation, New Orleans, Louisiana, USA.

Aims: Traditionally, acetabular component insertion during total hip arthroplasty (THA) is visually assisted in the posterior approach and fluoroscopically assisted in the anterior approach. The present study examined the accuracy of a new surgeon during anterior (NSA) and posterior (NSP) THA using robotic arm-assisted technology compared to two experienced surgeons using traditional methods.

Methods: Prospectively collected data was reviewed for 120 patients at two institutions. Read More

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Two-Week Cervical Vagus Nerve Stimulation in Chronic Pancreatitis Patients Induces Functional Connectivity Changes of Limbic Structures.

Neuromodulation 2021 Jun 14. Epub 2021 Jun 14.

Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.

Objectives: Noninvasive vagus nerve stimulation (nVNS) has not only shown antinociceptive effects, but also demonstrated anti-inflammatory and antidepressant effects. These effects could be beneficial in chronic pancreatitis (CP) patients suffering from chronic abdominal pain, even though the underlying central mechanisms remain unclear. The aim was to investigate the effect of cervical nVNS in patients with painful CP on brain functional connectivity and cerebral metabolites. Read More

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Development of prediction models for successful external cephalic version and delivery outcome.

Arch Gynecol Obstet 2021 Jun 14. Epub 2021 Jun 14.

Department of Obstetrics Women's Hospital, Zhejiang University School of Medicine, 1st Xueshi Road, Hangzhou, 310006, Zhejiang, China.

Objective: To develop prediction models for the chance of successful external cephalic version (ECV) and delivery outcome.

Study Design: This is a single-center retrospective study including 350 pregnant women with a singleton non-cephalic pregnancy at or after 36 weeks of gestational age. We selected 22 factors for ECV prediction and 21 for delivery outcome after successful ECV prediction as candidate predictors. Read More

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Isolated ruptured dissecting aneurysm of PICA with extremely narrow neck managed by a novel endovascular technique-a case report and review of literature.

Childs Nerv Syst 2021 Jun 14. Epub 2021 Jun 14.

Department of Neuroradiology, Sri Ramachandra Institute of Higher Education and Research, Porur, Chennai, 600116, India.

Dissecting aneurysms of posterior inferior cerebellar artery (PICA) are usually extensions of vertebral artery dissection. Isolated dissecting aneurysms of PICA are extremely rare. A 5-month-old female child presented with history of fall from a height of around 2 ft. Read More

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Neurosurgical anatomy of the floor of the third ventricle and related vascular structures.

Surg Radiol Anat 2021 Jun 14. Epub 2021 Jun 14.

Unit of Anatomy, Department of Biomedicine, Faculty of Medicine, University of Porto, Alameda Professor Hernâni Monteiro, 4200-319, Porto, Portugal.

Purpose: Anatomical knowledge of the floor of the third ventricle (FTV) is essential in avoiding surgical complications during endoscopic third ventriculostomy. The purpose of this study was to characterize the morphometry of FTV and related arteries, particularly the basilar artery (BA), as well as the factors that influence it.

Methods: Twenty-six formalin-fixed adult brains and two hundred adult brain MRIs were studied focusing on FTV and related arteries. Read More

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Expandable Cage Technology-Transforaminal, Anterior, and Lateral Lumbar Interbody Fusion.

Oper Neurosurg (Hagerstown) 2021 Jun;21(Supplement_1):S69-S80

Department of Neurosurgery, Henry Ford Hospital, Detroit, Michigan, USA.

This review of the literature will focus on the indications, surgical techniques, and outcomes for expandable transforaminal lumbar interbody fusion (TLIF), anterior lumbar interbody fusion (ALIF), and lateral lumbar interbody fusion (LLIF) operations. The expandable TLIF cage has become a workhorse for common degenerative pathology, whereas expandable ALIF cages carry the promise of greater lordotic correction while evading the diseased posterior elements. Expandable LLIF cages call upon minimally invasive techniques for a retroperitoneal, transpsoas approach to the disc space, obviating the need for an access surgeon and decreasing risk of injury to the critical neurovascular structures. Read More

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Characteristics of left atrial remodeling in patients with atrial fibrillation and hypertrophic cardiomyopathy in comparison to patients without hypertrophy.

Sci Rep 2021 Jun 14;11(1):12411. Epub 2021 Jun 14.

Department of Electrophysiology, Heart Center, University of Leipzig, Strümpellstr. 39, 04289, Leipzig, Germany.

Atrial fibrillation (AF) leads to remodeling characterized by changes in both size and shape of the left atrium (LA). Here we aimed to study the effect of hypertrophic cardiomyopathy (HCM) on the pattern of LA remodeling in AF-patients. HCM-patients (n = 23) undergoing AF ablation (2009-2012) were matched and compared with 125 Non-HCM patients from our prospective registry. Read More

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The insulo-opercular cortex encodes food-specific content under controlled and naturalistic conditions.

Nat Commun 2021 06 14;12(1):3609. Epub 2021 Jun 14.

Department of Neurosurgery, Stanford University, Stanford, CA, USA.

The insulo-opercular network functions critically not only in encoding taste, but also in guiding behavior based on anticipated food availability. However, there remains no direct measurement of insulo-opercular activity when humans anticipate taste. Here, we collect direct, intracranial recordings during a food task that elicits anticipatory and consummatory taste responses, and during ad libitum consumption of meals. Read More

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Electric signals counterbalanced posterior vs anterior PTEN signaling in directed migration of Dictyostelium.

Cell Biosci 2021 Jun 14;11(1):111. Epub 2021 Jun 14.

Department of Dermatology, School of Medicine, University of California, Davis, CA, 95618, USA.

Background: Cells show directed migration response to electric signals, namely electrotaxis or galvanotaxis. PI3K and PTEN jointly play counterbalancing roles in this event via a bilateral regulation of PIP3 signaling. PI3K has been proved essential in anterior signaling of electrotaxing cells, whilst the role of PTEN remains elusive. Read More

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Biportal endoscopic posterior lumbar decompression and vertebroplasty for extremely elderly patients affected by lower lumbar delayed vertebral collapse with lumbosacral radiculopathy.

J Orthop Surg Res 2021 Jun 14;16(1):380. Epub 2021 Jun 14.

Department of Orthopedic Surgery, Spine Center, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, 1, Singil-ro, Yeongdeungpo-gu, Seoul, Republic of Korea, 07441.

Background: Lower lumbar osteoporotic vertebral compression fracture in extremely elderly patients can often lead to lumbosacral radiculopathy (LSR) due to delayed vertebral collapse (DVC). Surgical intervention requires posterior instrumented lumbar fusion as well as vertebral augmentation or anterior column reconstruction depending on the cleft formation and intravertebral instability. However, it is necessary to decide on surgery in consideration of the patient's frail status, surgical invasiveness, and rehabilitation. Read More

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Sheehan syndrome.

J Pak Med Assoc 2021 Apr;71(4):1282-12568

Department of Endocrinology, Sher-I-Kashmir Institute of Medical Sciences, Soura, Srinagar, Jammu and Kashmir, India.

Sheehan syndrome is an underestimated cause of hypopituitarism, which can be either partial or complete. It results from ischaemic necrosis of anterior pituitary during peripartum period leading to loss of one or more pituitary cell lines. Hyperplasia of pituitary gland during pregnancy increases demand for blood supply and at the same time compresses the pituitary gland. Read More

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Clinical effects of direct anterior internal fixation with Herbert screws on hip joint function and quality of life in patients with Pipkin II femoral head fractures.

Arch Orthop Trauma Surg 2021 Jun 14. Epub 2021 Jun 14.

Department of Traumatic Orthopedics, Renmin Hospital, Hubei University of Medicine, No.39 Chaoyang Road, Maojian, Shiyan, 442000, Hubei, China.

Objective: The study aimed to explore the therapeutic effects of direct anterior internal fixation with Herbert screws on hip joint function and quality of life in patients with Pipkin type II femoral head fractures (FHF).

Methods: From Dec 2017 to Jul 2020, 68 patients with Pipkin type II FHF were received in our hospital and divided into two groups. The direct anterior internal fixation (DAIF) group including 34 cases were treated by direct anterior internal fixation with Herbert screws. Read More

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Evaluation of the histological and biomechanical properties of poly-4-hydroxybutyrate scaffold for pelvic organ prolapse, compared with polypropylene mesh in a rabbit model.

Int Urogynecol J 2021 Jun 14. Epub 2021 Jun 14.

Division of Female Pelvic Medicine and Reconstructive Surgery, Donald and Barbara Zucker School of Medicine at Northwell Health, Long Island, NY, USA.

Introduction And Hypothesis: Poly-4-hydroxybutyrate (P4HB) is a biopolymer produced by Escherichia coli K12 bacteria. P4HB is fully resorbed in vivo by 18-24 months post-implantation. The aim of this study is to evaluate P4HB in the rabbit abdomen and vagina to determine that the biomechanical and histological properties are similar to the standard polypropylene mesh. Read More

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Morphological mechanism allowing a parasitic leech, Ozobranchus jantseanus (Rhynchobdellida: Ozobranchidae), to survive in ultra-low temperatures.

Biol Open 2021 Jun 14. Epub 2021 Jun 14.

Provincial Key Lab of the Conservation and Exploitation Research of Biological Resources in Anhui, Life Science College of Anhui Normal University, Wuhu, Anhui, 241000, PRC.

Ozobranchus jantseanus is the largest metazoan known to survive in liquid nitrogen without pretreatment to date, however, the mechanism underlying this tolerance remains unclear. In this study, the first analyses of histological and morphological changes in normal, frozen, and dehydrated states were performed. Adults survived after direct placement in liquid nitrogen for 96 h, with a survival rate of approximately 86. Read More

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Dental microwear texture gradients in guinea pigs reveal that material properties of the diet affect chewing behaviour.

J Exp Biol 2021 Jun 14. Epub 2021 Jun 14.

Applied and Analytical Palaeontology, Institute of Geosciences, Johannes Gutenberg University, J.-J.-Becher-Weg 21, 55128 Mainz, Germany.

Dental microwear texture analysis (DMTA) is widely used for diet inferences in extant and extinct vertebrates. Often, a reference tooth position is analysed in extant specimens, while isolated teeth are lumped together in fossil datasets. It is therefore important to test whether DMT is tooth position specific, and if so, what the causes for wear differences are. Read More

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Bail-out edge-to-edge mitral repair for an acute single leaflet device attachment: a case report.

Eur Heart J Case Rep 2021 Apr 30;5(4):ytab147. Epub 2021 Apr 30.

University Department of Cardiac Surgery, Heart Center Leipzig, Leipzig, Germany.

Background: An acute single leaflet device attachment (SLDA) may occur during transcatheter mitral valve edge-to-edge repair (TMVr), if an inadequate grasping of the target leaflet and/or a leaflet injury are concomitant. The bail-out TMVr often fails due to the complex pathophysiology.

Case Summary: We report a case of an acute SLDA after TMVr with the PASCAL Repair System for severe mitral regurgitation (MR) with mixed aetiology, i. Read More

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Defining an Ultrasound-guided Regional Anesthesia Curriculum for Emergency Medicine.

AEM Educ Train 2021 Jul 11;5(3):e10557. Epub 2020 Dec 11.

Department of Emergency Medicine Michigan Medicine Ann Arbor MI USA.

Objectives: Ultrasound-guided regional anesthesia (UGRA) can be a powerful tool in the treatment of painful conditions commonly encountered in emergency medicine (EM) practice. UGRA can benefit patients while avoiding the risks of procedural sedation and opioid-based systemic analgesia. Despite these advantages, many EM trainees do not receive focused education in UGRA and there is no published curriculum specifically for EM physicians. Read More

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Effect of spraying l-menthol on peristalsis resumption during endoscopic submucosal dissection of gastric tumors.

JGH Open 2021 Jun 6;5(6):653-657. Epub 2021 May 6.

Department of Endoscopy Cancer Institute Hospital Gastroenterology Center Tokyo Japan.

Background And Aim: l-Menthol has smooth muscle-relaxing and antiperistaltic effects. We examined its effectiveness against peristalsis resumption during endoscopic submucosal dissection (ESD) of gastric tumors.

Methods: We retrospectively examined clinical data of 485 patients (501 lesions) who underwent ESD for upper gastrointestinal tumors in 2017. Read More

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Wear of contemporary dental composite resin restorations: a literature review.

Restor Dent Endod 2021 May 25;46(2):e18. Epub 2021 Feb 25.

Department of Operative Dentistry, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.

Composite resins are the most commonly used dental restorative materials after minimally invasive dental procedures, and they offer an aesthetically pleasing appearance. An ideal composite restorative material should have wear properties similar to those of tooth tissues. Wear refers to the damaging, gradual loss or deformation of a material at solid surfaces. Read More

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TI VIBE inversion MRI - An alternative to CT for imaging of hip pain.

J Clin Orthop Trauma 2021 Aug 27;19:196-199. Epub 2021 May 27.

Department of Musculoskeletal Radiology, Royal Orthopedic Hospital, Birmingham, UK.

Introduction: MR and CT are excellent complimentary diagnostic modalities for evaluation of hip pain which are often used together along with radiographs. However, CT involves radiation, which is a concern particularly in younger patients. T1VIBE is a 3D gradient echo MR sequence with high intrinsic contrast between the bone and soft tissues with multiplanar capabilities. Read More

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Proximal Row Carpectomy in Young Patients.

JBJS Essent Surg Tech 2021 Jan-Mar;11(1). Epub 2021 Feb 4.

Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota.

Background: There continues to be controversy regarding the treatment of early-stage arthritis of the wrist, particularly in young patients, because of the large number of techniques, the poor long-term results for many of these techniques, and the overall paucity of high-level scientific data. Proximal row carpectomy (PRC) and 4-corner arthrodesis (4CA) have been established as the mainstay motion-sparing surgical treatment options in cases of early scapholunate advanced collapse and scaphoid nonunion advanced collapse arthritis. However, there is marked controversy surrounding the best treatment option for younger patients with greater physical demands because of the questionable outcomes associated with these motion-sparing options in such patients. Read More

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February 2021

Tubulointerstitial Nephritis and Uveitis Syndrome: Case Series and Literature Review.

Case Rep Ophthalmol Med 2021 2;2021:1812271. Epub 2021 Jun 2.

Department of Ophthalmology, Beatriz Ângelo Hospital, Loures, Portugal.

Tubulointerstitial nephritis and uveitis syndrome (TINU) is a rare oculorenal inflammatory entity with a probable autoimmune etiology. Interstitial nephritis may be asymptomatic and usually has a benign course with spontaneous resolution. Uveitis, instead, is classically anterior, bilateral, and nongranulomatous, but it can be unilateral and presents as posterior uveitis or panuveitis, sometimes with a chronic or recurrent evolution. Read More

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Reproducibility of vaginal immobilization balloons overnight for cervical cancer brachytherapy.

J Contemp Brachytherapy 2021 Jun 13;13(3):280-285. Epub 2021 May 13.

Department of Radiation Oncology, University of Arizona College of Medicine, Tucson, USA.

Purpose: The use of vaginal immobilization balloons placed into the vagina for immobilization of tandem and ovoid (T+O) applicator during high-dose-rate (HDR) brachytherapy delivery has been used at our institution, and seems to have improved our patient comfort, decreased procedure time, and minimized applicator misplacement. We aimed to show that these balloons, while originally marketed for single-day use, are safe and maintain applicator positioning/dosimetry when left overnight for treatment delivery on sequential days.

Material And Methods: Forty-two paired computed tomography (CT) scans from thirteen patients who underwent T+O HDR treatments on sequential days with vaginal immobilization balloons overnight were retrospectively compared to calculate mean change of balloon volumes and balloon/T+O distance to bony landmarks. Read More

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Pulsed Infrared Stimulation of Vertical Semicircular Canals Evokes Cardiovascular Changes in the Rat.

Front Neurol 2021 28;12:680044. Epub 2021 May 28.

Department of Biomedical Engineering, University of Miami, Miami, FL, United States.

A variety of stimuli activating vestibular end organs, including sinusoidal galvanic vestibular stimulation, whole body rotation and tilt, and head flexion have been shown to evoke significant changes in blood pressure (BP) and heart rate (HR). While a role for the vertical semicircular canals in altering autonomic activity has been hypothesized, studies to-date attribute the evoked BP and HR responses to the otolith organs. The present study determined whether unilateral activation of the posterior (PC) or anterior (AC) semicircular canal is sufficient to elicit changes in BP and/or HR. Read More

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