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cup positioning

William S Murphy, Ho Hyun Yun, Brett Hayden, Jens H Kowal, Stephen B Murphy
BACKGROUND: Cup malposition is a common cause of impingement, limitation of ROM, acceleration of bearing wear, liner fracture, and instability in THA. Previous studies of the safe zone based on plain radiographs have limitations inherent to measuring angles from two-dimensional projections. The current study uses CT to measure component position in stable and unstable hips to assess the presence of a safe zone for cup position in THA. QUESTIONS/PURPOSES: (1) Does acetabular component orientation, when measured on CT, differ in stable components and those revised for recurrent instability? (2) Do CT data support historic safe zone definitions for component orientation in THA? METHODS: We identified 34 hips that had undergone revision of the acetabulum for recurrent instability that also had a CT scan of the pelvis between August 2003 and February 2017...
February 2018: Clinical Orthopaedics and related Research
Anton Khlopas, Morad Chughtai, Randa K Elmallah, David Hip-Flores, Arthur L Malkani, Steven F Harwin, Michael A Mont, Michael D Ries
BACKGROUND: Bone loss in patients undergoing revision THA poses a considerable challenge for orthopaedic surgeons. Often, to achieve better fixation in remaining bone, larger diameter acetabular components and reaming superiorly may be necessary. However, this is likely to raise the hip center of rotation, which may lead to altered biomechanics, specifically, insufficiency of the abductor muscles, altered gait, and increased risk of dislocation from impingement. More recently, a newer acetabular shell has been designed to more closely replicate the native hip center of rotation in these circumstances while maintaining adequate fixation...
February 2018: Clinical Orthopaedics and related Research
Masaki Mogi, Katsuhiko Kohara, Yasuharu Tabara, Kana Tsukuda, Michiya Igase, Masatsugu Horiuchi
Our previous report indicated that sarcopenia is associated with arterial stiffness and cardiovascular death. The renin-angiotensin system (RAS) plays an important role in cardiovascular disease and its activation may be correlated with sarcopenia according to basic research. However, few clinical studies have assessed the correlation between skeletal muscle loss and RAS component concentrations in healthy subjects. The purpose of this study was to investigate the relationships between the excretion of angiotensinogen (AGT) and aldosterone (Ald) in 24-h urine samples and clinical and sarcopenic indices...
March 9, 2018: Hypertension Research: Official Journal of the Japanese Society of Hypertension
Guiqin Wang, Yuling Zeng, Jifeng Xu, Wengui Liu
We report a new method for calibrating the current gain of 1013 Ω amplifiers in both positive and negative mode used in thermal ionisation mass spectrometry (TIMS). This method uses any isotopic standard or sample to calibrate the gain factor as long as it can produce a stable current signal. It is simpler and more flexible than that recommended by Thermo-Fisher (the manufacture of the TIMS). In these analyses, the gains of five 1013 Ω amplifiers were assessed. The precision of gain factors was better than 100 ppm (2 RSD) in a day, and the long term reproducibility was better than 300 ppm (2 RSD) within 2 - 8 months...
March 9, 2018: Journal of Mass Spectrometry: JMS
X Fan, L L Wu, G G Xiao, Z Z Ma, F Liu
Objective: To analyze potentials of frequency-doubling technology perimetry (FDP) for diagnosing open-angle glaucoma (OAG) in perimetrically normal eyes of OAG patients diagnosed with standard automated perimetry (SAP) and relating factors from abnormalities on FDP to visual field loss on SAP. Methods: A prospective cohort study. Sixty-eight eyes of 68 OAG patients visiting the ophthalmic clinic of Peking University Third Hospital during November 2003 and October 2007 [32 primary open-angle glaucoma patients and 36 normal tension glaucoma patients, 32 males and 36 females, with an average age of (59±13) years] with unilateral field loss detected by SAP (Octopus101 tG2 program) were examined with the FDP N-30 threshold program (Humphrey Instruments) at baseline...
March 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
Jia Wang, Yonghao Han, Hao Liu, Guozhao Zhang, Cailong Liu, Chunxiao Gao
The electrical transport behavior of the superionic conductor AgBr was systematically studied under high pressure up to 30.0 GPa with electrochemical impedance spectra measurements and first-principles calculations. From impedance spectra measurements, a pressure-induced abnormal ionic-polaronic-ionic transition was found. Herein, the ionic to polaronic transition at 5.0 GPa occurs with the absence of a structural phase transition. At 8.6 GPa, the ionic state of AgBr can be reactivated after a structural phase transition...
March 6, 2018: Physical Chemistry Chemical Physics: PCCP
Zhixi Li, Yifan He, Stuart Keel, Wei Meng, Robert T Chang, Mingguang He
PURPOSE: To assess the performance of a deep learning algorithm for detecting referable glaucomatous optic neuropathy (GON) based on color fundus photographs. DESIGN: A deep learning system for the classification of GON was developed for automated classification of GON on color fundus photographs. PARTICIPANTS: We retrospectively included 48 116 fundus photographs for the development and validation of a deep learning algorithm. METHODS: This study recruited 21 trained ophthalmologists to classify the photographs...
March 2, 2018: Ophthalmology
Vahit Emre Ozden, Goksel Dikmen, Burak Beksac, Ismail Remzi Tozun
BACKGROUND: Placement of acetabular cup in the dysplastic hip is a challenging procedure. Using bulk femoral head autograft to increase the bony coverage of the cup is one of the techniques, which have been described. The impact of cup position on cup and autograft survival is a controversial issue. We aimed to determine whether the position of cementless acetabular cup used in conjunction with femoral head autograft in dysplastic hips affected the autograft-host incorporation with its final radiographic appearance and the cup survivorship into the second decade...
March 1, 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Maurizio Montalti, Francesco Castagnini, Federico Giardina, Enrico Tassinari, Federico Biondi, Aldo Toni
BACKGROUND: Total hip arthroplasty (THA) in severe developmental dysplasia of the hip (DDH) is a challenging procedure. The most used techniques involve anatomic cup positioning, augmentation femoral osteotomy. However, anatomic cup positioning is not always feasible in severe DDH and osteotomy nonunion may ensue. The purpose of the study was to assess the survivorship, the hip score results, the radiological parameters (fixation, loosening, component position) of a large cohort of patients with Crowe III and IV DDH, treated with high hip center and modular necks THAs...
February 2, 2018: Journal of Arthroplasty
Matthew P Abdel
Dislocation after revision total hip arthroplasty (THA) continues to be one of the most common and concerning complications after the procedure. As with every hip arthroplasty, it is essential to optimize component positioning, minimize impingement, and maintain the integrity of the abductor complex during the revision THAs. However, in several revision circumstances, additional strategies are required to mitigate the risk of dislocation, particularly those being revised for instability or those with cognitive or neuromuscular disorders...
February 27, 2018: Journal of Arthroplasty
Kanita Kunaratnam, Mark Halaki, Li Ming Wen, Louise A Baur, Victoria M Flood
Few studies have investigated the effect of maternal factors on child eating practices. Our study aimed to explore mother-child dietary behaviours and their associations with socio-demographic factors. A cross-sectional analysis was conducted using data from control participants (n 243) in the Healthy Beginnings Trial, which involved first-time mothers and their 2-year-old children. Mother-child dietary behaviours were assessed using short dietary questions (short FFQ) and their associations with socio-demographic factors were examined using binary logistic regression...
February 2018: British Journal of Nutrition
Lindsay McCORMACK, Elena B Hawryluk
Pediatric melanoma is a rare disease that affects approximately 6 out of every one million children and accounts for 1-4 percent of all melanomas. This article reviews the epidemiology, etiology, diagnosis, treatment and prognosis of pediatric melanoma - with particular attention to recent updates in the literature. While awareness of melanoma increases among the general population, recent data suggest stable and even declining incidence rates among certain pediatric populations. Studies have examined clinical features and presentations of melanoma among the pediatric population and the conventional ABCDE criteria used to diagnosis adult melanoma may not be entirely appropriate for pediatric melanoma; as such, additional pediatric-ABCD and CUP criteria have been proposed...
February 26, 2018: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
Casey A Myers, Peter J Laz, Kevin B Shelburne, Dana L Judd, Daniel N Huff, Joshua D Winters, Jennifer E Stevens-Lapsley, Paul J Rullkoetter
BACKGROUND: Component alignment is an important consideration in total hip arthroplasty. The impact of changes in alignment on muscle forces and joint contact forces during dynamic tasks are not well understood, and have the potential to influence surgical decision making. The objectives of this study were to assess the impact of femoral head/stem and cup component placement on hip muscle and joint contact forces during tasks of daily living and to identify which alignment parameters have the greatest impact on joint loading...
February 14, 2018: Clinical Biomechanics
Carlos J Marques, Tobias Martin, Franziska Fiedler, Mathias Weber, Viktor Breul, Frank Lampe, Josef Kozak
OBJECTIVES: Pelvic tilt is the angle between the anterior pelvic plane and the coronal plane. It affects cup positioning in total hip arthroplasty. The primary objective of this study was to test the intra- and inter-rater reliability of a navigated smart device-based ultrasound system for pelvic tilt assessment. The secondary objective was to test the inter-rater variability of the measurements on a hip phantom. METHODS: A repeated-measures design was used. Two raters measured the pelvic tilt of 12 symptom-free young adults in upright and supine positions...
February 26, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Hongye Lu, Lu He, Yibing Zhao, Huanxin Meng
Background: Glycine air polishing has been proved to be safe, comfortable and time-saving. Whether it could substitute ultrasonic scaling to remove dental plaque biofilm during periodontal maintenance remains unclear. The purposes of this study were to evaluate the effect of supragingival glycine air polishing (SGAP) on the subgingival periodontal pathogens during maintenance therapy and to check the association of periodontal pathogens and clinical parameters. Methods: Twenty-three chronic periodontitis patients during their maintenance therapy were enrolled in the 12-week study...
2018: PeerJ
Masahiro Yamasaki, Kunihiko Funaishi, Naomi Saito, Ayaka Sakano, Megumu Fujihara, Wakako Daido, Sayaka Ishiyama, Naoko Deguchi, Masaya Taniwaki, Nobuyuki Ohashi, Noboru Hattori
RATIONALE: Only a few cases of putative lung adenocarcinoma presenting as carcinoma of unknown primary site (CUP) with epidermal growth factor receptor (EGFR) mutation have been reported, and the efficacy of EGFR-tyrosine kinase inhibitors (TKIs) for these cases is unclear. PATIENT CONCERNS AND DIAGNOSES: A 67-year-old man complained of paresis of the right lower extremity, dysarthria, and memory disturbance. Computed tomography and magnetic resonance imaging showed multiple brain tumors with brain edema and swelling of the left supraclavicular, mediastinal, and upper abdominal lymph nodes...
February 2018: Medicine (Baltimore)
Daneysa Lahis Kalschne, Marcelo Caldeira Viegas, Antonio José De Conti, Marinês Paula Corso, Marta de Toledo Benassi
Between 15 and 20% of Brazilian coffee production corresponds to defective beans (PVA), which decreases the quality of the coffee brew. Steam treatment has been reported as an alternative to improve the volatile profile and cup quality of coffee. The aim of this study was to propose a steam treatment of defective Coffea canephora beans to improve the volatile profile of the roasted coffee. The sensory impacts of adding steamed coffee (SC) in Coffea arabica blends were evaluated. The steam treatments studied modified the volatile profile of roasted SCs, increasing the contents of acetoin, benzyl alcohol, maltol, 2,6-dimethylpyrazine, 2-furfurylthiol, and 5-methylfurfural and decreasing the contents of 4-ethylguaiacol, isovaleric acid, methional, 2,3-diethyl-5-methylpyrazine, and 3-methoxy-3-methylpyrazine...
March 2018: Food Research International
Özlem Tüfekçi, Melek Erdem, Hale Ören, Şebnem Yilmaz
Cup-like phenotype is defined in some subtypes of acute myeloid leukemia (AML) and have been associated with NPM-1 and/or FLT3-ITD positivity in the presence of normal karyotype in >60% of patients. Herein we present two pediatric AML-M1 patients with cuplike nuclear morphology and NPM-1 positivity. Both patients were negative for FLT3-ITD mutation. NPM-1 mutation and FLT3-ITD mutation should be kept in mind in AML patients with cup-like blast morphology as these two mutations are important molecular markers for prognosis, risk group classification and also for response to treatment...
February 9, 2018: Journal of Pediatric Hematology/oncology
Jevrosima Stevanovic, Zoran Stanimirovic, Predrag Simeunovic, Nada Lakic, Ivica Radovic, Marina Sokovic, Leo J L D VAN Griensven
This study was done to discover any beneficial effect of a medicinal mushroom Agaricus brasiliensis extract on the honey bee. Firstly, a laboratory experiment was conducted on 640 bees reared in 32 single-use plastic rearing cups. A. brasiliensis extract proved safe in all doses tested (50, 100 and 150 mg/kg/day) irrespective of feeding mode (sugar syrup or candy). Secondly, a three-year field experiment was conducted on 26 colonies treated with a single dose of A. brasiliensis extract (100 mg/kg/day) added to syrup...
February 1, 2018: Anais da Academia Brasileira de Ciências
Paul Wilkening, Farshid Alambeigi, Ryan J Murphy, Russell H Taylor, Mehran Armand
This paper presents the development and evaluation of concurrent control of a robotic system for less-invasive treatment of osteolytic lesions behind an acetabular implant. This system implements safety constraints including a remote center of motion (RCM), virtual walls, and joint limits while operating through the screw holes of the acetabular implant. The formulated linear constrained optimization problem ensures these constraints are satisfied while maintaining precise control of the tip of a Continuum Dexterous Manipulator (CDM) attached to a positioning robot...
July 2017: IEEE Robotics and Automation Letters
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