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https://www.readbyqxmd.com/read/27916869/error-analysis-and-experimental-study-of-a-bi-planar-parallel-mechanism-in-a-pedicle-screw-robot-system
#1
Qingjuan Duan, Zhijiang Du, Hongjian Yu, Yongfeng Wang, Wei Dong
Due to the urgent need for high precision surgical equipment for minimally invasive spinal surgery, a novel robot-assistant system was developed for the accurate placement of pedicle screws in lumbar spinal surgeries. The structure of the robot was based on a macro-micro mechanism, which includes a serial mechanism (macro part) and a bi-planar 5R parallel mechanism (micro part). The macro part was used to achieve a large workspace, while the micro part was used to obtain high stiffness and accuracy. Based on the transfer function of dimension errors, the factors affecting the accuracy of the end effectors were analyzed...
November 30, 2016: Sensors
https://www.readbyqxmd.com/read/27909787/test-retest-reliability-of-tibiofemoral-joint-space-width-measurements-made-using-a-low-dose-standing-ct-scanner
#2
Neil A Segal, John Bergin, Andrew Kern, Christian Findlay, Donald D Anderson
OBJECTIVE: To determine the test-retest reliability of knee joint space width (JSW) measurements made using standing CT (SCT) imaging. SUBJECTS AND METHODS: This prospective two-visit study included 50 knees from 30 subjects (66% female; mean ± SD age 58.2 ± 11.3 years; BMI 29.1 ± 5.6 kg/m(2); 38% KL grade 0-1). Tibiofemoral geometry was obtained from bilateral, approximately 20° fixed-flexed SCT images acquired at visits 2 weeks apart. For each compartment, the total joint area was defined as the area with a JSW <10 mm...
December 1, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27859535/marker-based-technique-for-visualizing-radiolucent-implant-components-in-radiographic-imaging
#3
Kimberley Lam-Tin-Cheung, Xunhua Yuan, Hristo N Nikolov, Brent A Lanting, Douglas D Naudie, Matthew G Teeter
Radiography is the predominant imaging modality used for the in-vivo analysis of orthopaedic implants. A major disadvantage of radiography is that the articulating joint components that are composed of radiolucent polyethylene cannot be directly visualized. Current strategies attempt to circumvent this limitation by estimating component positions and simplifying the joint system, however, these approaches lead to a number of associated errors. Thus, this study provides a method to enable the visualization of the polyethylene component of total knee replacements in radiographic images...
November 9, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27858233/utility-of-contemporaneous-dual-read-in-the-setting-of-emergency-teleradiology-reporting
#4
Anjali Agrawal, D B Koundinya, Jayadeepa Srinivas Raju, Anurag Agrawal, Arjun Kalyanpur
PURPOSE: Emergency radiology requires rapid and accurate interpretation of imaging examinations. Missed findings may lead to adverse outcomes. Double reporting may be used to minimize errors. Limited contemporaneous double reporting may be most efficient and cost-effective, but no data exists. This study is intended to examine the benefits of double reading and identify examinations where this would be most useful. METHODS: In this study, dual reporting was conducted in a parallel reading environment in a teleradiology practice for 3779 radiological procedures performed at two radiology centers in the USA over a period of 4 months...
November 18, 2016: Emergency Radiology
https://www.readbyqxmd.com/read/27843197/a-correlative-classification-study-of-schizophrenic-patients-with-results-of-clinical-evaluation-and-structural-magnetic-resonance-images
#5
Wen-Lin Chu, Min-Wei Huang, Bo-Lin Jian, Chih-Yao Hsu, Kuo-Sheng Cheng
Patients with schizophrenia suffer from symptoms such as hallucination and delusion. There are currently a number of publications that discuss the treatment, diagnosis, prognosis, and damage in schizophrenia. This study utilized joint independent component analysis to process the images of GMV and WMV and incorporated the Wisconsin card sorting test (WCST) and the positive and negative syndrome scale (PANSS) to examine the correlation of obtained brain characteristics. We also used PANSS score to classify schizophrenic patients into acute and subacute cases, to analyze the brain structure differences...
2016: Behavioural Neurology
https://www.readbyqxmd.com/read/27836580/a-study-to-assess-the-accuracy-of-adductor-tubercle-as-a-reliable-landmark-used-to-determine-the-joint-line-of-the-knee-in-a-chinese%C3%A2-population
#6
Jianlin Xiao, Shengqun Wang, Wei Chen, Yuhui Yang, Tong Liu, Jianlin Zuo
BACKGROUND: Restoring the joint line (JL) is a key element of performing joint arthroplasty, which is a challenging preposition during revision surgeries. We investigated the accuracy of 2 different methods of identifying the JL using the adductor tubercle (AT) as the reference landmark. METHODS: Standardized protocols for measurements from 50 knee radiographs were established. Femoral width (FW) and the distance from the AT to the JL (ATJL) were measured on anteroposterior radiographs, and the femoral diameter (FD) was measured on true lateral views...
October 11, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27825939/location-of-the-ankle-center-for-total-knee-arthroplasty
#7
Shigeki Asada, Shigeshi Mori, Shinji Inoue, Ichiroh Tsukamoto, Masao Akagi
BACKGROUND: The purpose of this study was to investigate the ankle center position as determined from the malleoli for total knee arthroplasty (TKA). METHODS: We retrospectively analyzed computed tomography data from 102 patients with osteoarthritic knees. The tibial anteroposterior (AP) axis and transmalleolar axis (TMA) were used as rotational reference axes of the knee and ankle joint, respectively. With these axes, we regarded the offset distance from the intermalleolar midpoint as the position of the ankle center and investigated any angular osteotomy errors on the proximal tibia when the ankle center was assumed to the intermalleolar midpoint...
November 5, 2016: Knee
https://www.readbyqxmd.com/read/27821676/meta-analyses-of-the-effects-of-standardized-handoff-protocols-on-patient-provider-and-organizational-outcomes
#8
Joseph R Keebler, Elizabeth H Lazzara, Brady S Patzer, Evan M Palmer, John P Plummer, Dustin C Smith, Victoria Lew, Sarah Fouquet, Y Raymond Chan, Robert Riss
OBJECTIVE: The overall purpose was to understand the effects of handoff protocols using meta-analytic approaches. BACKGROUND: Standardized protocols have been required by the Joint Commission, but meta-analytic integration of handoff protocol research has not been conducted. METHOD: The primary outcomes investigated were handoff information passed during transitions of care, patient outcomes, provider outcomes, and organizational outcomes...
December 2016: Human Factors
https://www.readbyqxmd.com/read/27806493/proprioception-of-knee-joint-in-athletes-and-non-athletes-obese
#9
Hajar Moravveji, Ali Ghanbari, Fahimeh Kamali
BACKGROUND: Proprioception plays an integral role in the neuromotor control of the knee joint. The objective of this study was to evaluate the relationship of knee joint proprioception deficit and regular exercise activities with obesity. MATERIALS & METHODS: In this case control study, we had 60 participants, aged 18 to 35 in four groups (15 athletes obese; 15 athletes with normal weight; 15 non-athletes obese; 15 non-athletes with normal weight). The average Body Mass Index for the obese groups was 33...
July 27, 2016: Global Journal of Health Science
https://www.readbyqxmd.com/read/27799664/effects-of-wearing-ankle-weight-on-knee-joint-repositioning-sense-in-the-elderly
#10
Sooyoung Kim, Daeun Jung, Jintae Han, Jaemin Jung
[Purpose] To investigate the effects of different ankle weights on knee joint repositioning sense in elderly individuals. [Subjects and Methods] Twenty-one subjects were divided for assessment as follows: young (20-30 years, n=10) and elderly (60-70 years, n=11). Knee joint repositioning error was measured by asking the subjects to reposition the target angle of their knee joints while wearing different ankle weights (0%, 0.5%, 1%, and 1.5%) in an open kinetic chain. The Hawk Digital System (60 Hz; Motion Analysis, Santa Rosa, CA, USA) was used to measure knee joint repositioning error...
September 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27790181/competition-in-the-brain-the-contribution-of-eeg-and-fnirs-modulation-and-personality-effects-in-social-ranking
#11
Michela Balconi, Maria E Vanutelli
In the present study, the social ranking perception in competition was explored. Brain response (alpha band oscillations, EEG; hemodynamic activity, O2Hb), as well as self-perception of social ranking, cognitive performance, and personality trait (Behavioral Activation System, BAS) were considered during a competitive joint-action. Subjects were required to develop a strategy to obtain a better outcome than a competitor (C) (in term of error rate, and response time, RT). A pre-feedback (without a specific feedback on the performance) and a post-feedback condition (which reinforced the improved performance) were provided...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27788411/frequency-of-medical-malpractice-claims-the-effects-of-volumes-and-specialties
#12
Luigi Buzzacchi, Giuseppe Scellato, Elisa Ughetto
A medical malpractice occurs when a physician or healthcare personnel, because of lack of skill or negligence, causes injury to a patient, who can decide to claim for the damages suffered by suing the facility and/or healthcare personnel. In this paper we analyze the frequency of medical malpractice insurance claims in an Italian region, in order to estimate the presence of significant trends and to identify volume effects at both department and healthcare organization levels. We rely on a unique dataset reporting the universe of 2144 injuries caused by medical or surgical errors that resulted in a request to the insurer for coverage over the years 2004-2010 in ten public healthcare organizations...
December 2016: Social Science & Medicine
https://www.readbyqxmd.com/read/27771360/sensorimotor-control-in-individuals-with-idiopathic-neck-pain-and-healthy-individuals-a-systematic-review-and-meta-analysis
#13
Rutger M J de Zoete, Peter G Osmotherly, Darren A Rivett, Scott F Farrell, Suzanne J Snodgrass
OBJECTIVE: To (1) identify reported tests used to assess sensorimotor control in individuals with idiopathic neck pain and (2) investigate whether these test can quantify differences between individuals with idiopathic neck pain and healthy individuals. DATA SOURCES: Databases AMED, CINAHL, Cochrane Central Register of Controlled Trials, EMBASE, MEDLINE, PEDro, SCOPUS and SportDiscus. STUDY SELECTION: Studies reporting sensorimotor outcomes in individuals with idiopathic neck pain or healthy individuals were identified...
October 19, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27754783/the-effects-of-fast-bowling-fatigue-and-adhesive-taping-on-shoulder-joint-position-sense-in-amateur-cricket-players-in-victoria-australia
#14
Nivan Weerakkody, Trevor Allen
The impact that muscle fatigue and taping have on proprioception in an applied sporting context remains unclear. The purpose of this study was to investigate disturbances in position sense at the shoulder joint, and asses the effectiveness of adhesive tape in preventing injury and improving performance, after a bout of cricket fast bowling. Among amateur cricket players (N = 14), shoulder position sense, maximum voluntary contraction (MVC) force and bowling accuracy was assessed before and immediately after a fatiguing exercise bout of fast bowling...
October 18, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27727321/robot-assisted-proprioceptive-training-with-added-vibro-tactile-feedback-enhances-somatosensory-and-motor-performance
#15
Anna Vera Cuppone, Valentina Squeri, Marianna Semprini, Lorenzo Masia, Jürgen Konczak
This study examined the trainability of the proprioceptive sense and explored the relationship between proprioception and motor learning. With vision blocked, human learners had to perform goal-directed wrist movements relying solely on proprioceptive/haptic cues to reach several haptically specified targets. One group received additional somatosensory movement error feedback in form of vibro-tactile cues applied to the skin of the forearm. We used a haptic robotic device for the wrist and implemented a 3-day training regimen that required learners to make spatially precise goal-directed wrist reaching movements without vision...
2016: PloS One
https://www.readbyqxmd.com/read/27720573/endpoint-accuracy-in-manual-control-of-a-steerable-needle
#16
Nick J van de Berg, Jenny Dankelman, John J van den Dobbelsteen
PURPOSE: To study the ability of a human operator to manually correct for errors in the needle insertion path without partial withdrawal of the needle by means of an active, tip-articulated steerable needle. MATERIALS AND METHODS: The needle is composed of a 1.32-mm outer-diameter cannula, with a flexure joint near the tip, and a retractable stylet. The bending stiffness of the needle resembles that of a 20-gauge hypodermic needle. The needle functionality was evaluated in manual insertions by steering to predefined targets and a lateral displacement of 20 mm from the straight insertion line...
October 6, 2016: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/27712856/knee-joint-position-sense-ability-in-elite-athletes-who-have-returned-to-international-level-play-following-acl-reconstruction-a-cross-sectional-study
#17
Nicola Relph, Lee Herrington
BACKGROUND: Following an ACL injury, reconstruction (ACL-R) and rehabilitation, athletes may return to play with a proprioceptive deficit. However, literature is lacking to support this hypothesis in elite athletic groups who have returned to international levels of performance. It is possible the potentially heightened proprioceptive ability evidenced in athletes may negate a deficit following injury. The purpose of this study was to consider the effects of ACL injury, reconstruction and rehabilitation on knee joint position sense (JPS) on a group of elite athletes who had returned to international performance...
December 2016: Knee
https://www.readbyqxmd.com/read/27708964/oxidative-stress-and-related-factors-in-patients-with-ankylosing-spondylitis
#18
Dilek Solmaz, Didem Kozacı, İsmail Sarı, Ali Taylan, Fatoş Önen, Nurullah Akkoç, Servet Akar
OBJECTIVE: Ankylosing spondylitis (AS) is a chronic inflammatory disease of the spine and sacroiliac joints of unknown etiology. Recent studies have reported increased oxidative stress, which is implicated in the pathogenesis of a number of diseases, in AS. The purpose of this study was to investigate oxidative stress and related factors in AS. MATERIAL AND METHODS: Eighty-five patients with AS [36 (16-64) years; 65 male/20 female] and 56 healthy subjects [36 (21-63) years; 39 male/17 female] with no known cardiovascular risk factors were enrolled...
March 2016: Eur J Rheumatol
https://www.readbyqxmd.com/read/27705061/errors-in-shoulder-joint-position-sense-mainly-come-from-the-glenohumeral-joint
#19
Yin-Liang Lin, Andrew Karduna
While synchronous movement of glenohumeral and scapulothoracic joints has been emphasized in previous kinematics studies, most investigations of shoulder joint position sense have treated the shoulder complex as a single joint. The purposes of this study were to investigate the joint position sense errors of the humerothoracic, glenohumeral and scapulothoracic joints at different elevation angles and to examine whether the errors of the glenohumeral and scapulothoracic joints contribute to the errors of the humerothoracic joint...
October 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27695200/quantum-memory-receiver-for-superadditive-communication-using-binary-coherent-states
#20
Aleksandra Klimek, Michał Jachura, Wojciech Wasilewski, Konrad Banaszek
We propose a simple architecture based on multimode quantum memories for collective readout of classical information keyed using a pair coherent states, exemplified by the well-known binary phase shift keying format. Such a configuration enables demonstration of the superadditivity effect in classical communication over quantum channels, where the transmission rate becomes enhanced through joint detection applied to multiple channel uses. The proposed scheme relies on the recently introduced idea to prepare Hadamard sequences of input symbols that are mapped by a linear optical transformation onto the pulse position modulation format [Guha, S...
November 12, 2016: Journal of Modern Optics
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