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joint position error

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https://www.readbyqxmd.com/read/28099472/elastic-tape-improved-shoulder-joint-position-sense-in-chronic-hemiparetic-subjects-a-randomized-sham-controlled-crossover-study
#1
Gabriela Lopes Dos Santos, Matheus Bragança Souza, Kaat Desloovere, Thiago Luiz Russo
BACKGROUND: Elastic tape has been widely used in clinical practice in order to improve upper limb (UL) sensibility. However, there is little evidence that supports this type of intervention in stroke patients. OBJECTIVE: To verify the effect of elastic tape, applied to the paretic shoulder, on joint position sense (JPS) during abduction and flexion in subjects with chronic hemiparesis compared to sham tape (non-elastic tape). Furthermore, to verify if this potential effect is correlated to shoulder subluxation measurements and sensorimotor impairment...
2017: PloS One
https://www.readbyqxmd.com/read/28088244/study-of-the-variability-of-scapular-inclination-and-the-glenoid-version-considerations-for-preoperative-planning-clinical-radiological-study
#2
Petr Fulin, Martin Kysilko, David Pokorny, Radek Padr, Nikola Kasprikova, Ivan Landor, Antonin Sosna
BACKGROUND: Preoperative planning with the aid of imaging methods is a principal factor in successful surgery on the shoulder. This work aims to evaluate the variability of glenoid version, spiralling twist and scapular inclination in relation to the frontal axis. Studies focusing on measuring the variability of scapular inclination in the standardised rest position are lacking in the literature. METHODS: We evaluated 104 CT scans of the shoulder. We measured the glenoid version with respect to the scapular axis at three levels...
January 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28068293/a-hybrid-bmi-based-exoskeleton-for-paresis-emg-control-for-assisting-arm-movements
#3
Toshihiro Kawase, Takeshi Sakurada, Yasuharu Koike, Kenji Kansaku
OBJECTIVE: Brain-machine interface (BMI) technologies have succeeded in controlling robotic exoskeletons, enabling some paralyzed people to control their own arms and hands. We have developed an exoskeleton asynchronously controlled by EEG signals. In this study, to enable real-time control of the exoskeleton for paresis, we developed a hybrid system with EEG and EMG signals, and the EMG signals were used to estimate its joint angles. APPROACH: Eleven able-bodied subjects and two patients with upper cervical spinal cord injuries (SCIs) performed hand and arm movements, and the angles of the metacarpophalangeal (MP) joint of the index finger, wrist, and elbow were estimated from EMG signals using a formula that we derived to calculate joint angles from EMG signals, based on a musculoskeletal model...
January 9, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28060536/proprioception-in-patients-with-anterior-cruciate-ligament-tears
#4
Hyun-Jung Kim, Jin-Hyuck Lee, Dae-Hee Lee
BACKGROUND: Because of a reduction in the number of mechanoreceptors or alterations of their characteristics, anterior cruciate ligament (ACL) tears lead not only to mechanical instability but also to impaired proprioception. Purpose/Hypothesis: This study analyzed whether ACL tears cause a greater decrease in proprioception in injured than in uninjured knees. The hypothesis was that knee proprioception after ACL tears would decrease more in injured than in contralateral uninjured knees, regardless of the method used to measure knee proprioception...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28048318/we-h-brc-06-a-unified-machine-learning-based-probabilistic-model-for-automated-anomaly-detection-in-the-treatment-plan-data
#5
X Chang, A Kalet, S Liu, D Yang
PURPOSE: The purpose of this work was to investigate the ability of a machine-learning based probabilistic approach to detect radiotherapy treatment plan anomalies given initial disease classes information. METHODS: In total we obtained 1112 unique treatment plans with five plan parameters and disease information from a Mosaiq treatment management system database for use in the study. The plan parameters include prescription dose, fractions, fields, modality and techniques...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047829/th-ab-201-07-filmless-treatment-localization-qa-for-the-cyberknife-system
#6
J Gersh, M Noll
PURPOSE: Accuray recommends daily evaluation of the treatment localization and delivery systems (TLS/TDS) of the CyberKnife. The vendor-provided solution is a Winston-Lutz-type test that evaluates film shadows from an orthogonal beam pair (known as AQA). Since film-based techniques are inherently inefficient and potentially inconsistent and uncertain, this study explores a method which provides a comparable test with greater efficiency, consistency, and certainty. This test uses the QAStereoChecker (QASC, Standard Imaging, Inc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047228/th-ab-202-05-best-in-physics-joint-imaging-therapy-first-online-ultrasound-guided-mlc-tracking-for-real-time-motion-compensation-in-radiotherapy
#7
S Ipsen, R Bruder, R O'Brien, P Keall, A Schweikard, P Poulsen
PURPOSE: While MLC tracking has been successfully used for motion compensation of moving targets, current real-time target localization methods rely on correlation models with x-ray imaging or implanted electromagnetic transponders rather than direct target visualization. In contrast, ultrasound imaging yields volumetric data in real-time (4D) without ionizing radiation. We report the first results of online 4D ultrasound-guided MLC tracking in a phantom. METHODS: A real-time tracking framework was installed on a 4D ultrasound station (Vivid7 dimension, GE) and used to detect a 2mm spherical lead marker inside a water tank...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28026745/wearable-vector-electrical-bioimpedance-system-to-assess-knee-joint-health
#8
Sinan Hersek, Hakan Toreyin, Caitlin N Teague, Mindy L Millard-Stafford, Hyeon-Ki Jeong, Miheer M Bavare, Paul Wolkoff, Michael N Sawka, Omer T Inan
: We designed and validated a portable electrical bioimpedance (EBI) system to quantify knee joint health. METHODS: Five separate experiments were performed to demonstrate the: (1) ability of the EBI system to assess knee injury and recovery; (2) inter-day variability of knee EBI measurements; (3) sensitivity of the system to small changes in interstitial fluid volume; (4) reducing the error of EBI measurements using acceleration signals; (5) use of the system with dry electrodes integrated to a wearable knee wrap...
December 22, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28024426/across-subject-calibration-of-an-instrumented-glove-to-measure-hand-movement-for-clinical-purposes
#9
Verónica Gracia-Ibáñez, Margarita Vergara, James H Buffi, Wendy M Murray, Joaquín L Sancho-Bru
Motion capture of all degrees of freedom of the hand collected during performance of daily living activities remains challenging. Instrumented gloves are an attractive option because of their higher ease of use. However, subject-specific calibration of gloves is lengthy and has limitations for individuals with disabilities. Here, a calibration procedure is presented, consisting in the recording of just a simple hand position so as to allow capture of the kinematics of 16 hand joints during daily life activities even in case of severe injured hands...
December 27, 2016: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/27986326/kinematic-models-of-the-upper-limb-joints-for-multibody-kinematics-optimisation-an-overview
#10
Sonia Duprey, Alexandre Naaim, Florent Moissenet, Mickaël Begon, Laurence Chèze
Soft tissue artefact (STA), i.e. the motion of the skin, fat and muscles gliding on the underlying bone, may lead to a marker position error reaching up to 8.7cm for the particular case of the scapula. Multibody kinematics optimisation (MKO) is one of the most efficient approaches used to reduce STA. It consists in minimising the distance between the positions of experimental markers on a subject skin and the simulated positions of the same markers embedded on a kinematic model. However, the efficiency of MKO directly relies on the chosen kinematic model...
December 9, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27983676/estimation-of-full-body-poses-using-only-five-inertial-sensors-an-eager-or-lazy-learning-approach
#11
Frank J Wouda, Matteo Giuberti, Giovanni Bellusci, Peter H Veltink
Human movement analysis has become easier with the wide availability of motion capture systems. Inertial sensing has made it possible to capture human motion without external infrastructure, therefore allowing measurements in any environment. As high-quality motion capture data is available in large quantities, this creates possibilities to further simplify hardware setups, by use of data-driven methods to decrease the number of body-worn sensors. In this work, we contribute to this field by analyzing the capabilities of using either artificial neural networks (eager learning) or nearest neighbor search (lazy learning) for such a problem...
December 15, 2016: Sensors
https://www.readbyqxmd.com/read/27973620/a-genome-wide-snp-linkage-analysis-suggests-a-susceptibility-locus-on-6p21-for-ankylosing-spondylitis-and-inflammatory-back-pain-trait
#12
Yanli Zhang, Zetao Liao, Qiujing Wei, Yunfeng Pan, Xinwei Wang, Shuangyan Cao, Zishi Guo, Yuqiong Wu, Ju Rong, Ou Jin, Manlong Xu, Zhiming Lin, Jieruo Gu
OBJECTIVES: To screen susceptibility loci for ankylosing spondylitis (AS) using an affected-only linkage analysis based on high-density single nucleotide polymorphisms (SNPs) in a genome-wide manner. PATIENTS AND METHODS: AS patients from ten families with Cantonese origin of China were enrolled in the study. Blood samples were genotyped using genomic DNA derived from peripheral blood leukocytes by Illumina HumanHap 610-Quad SNP Chip. Genotype data were generated using the Illumina BeadStudio 3...
2016: PloS One
https://www.readbyqxmd.com/read/27916869/error-analysis-and-experimental-study-of-a-bi-planar-parallel-mechanism-in-a-pedicle-screw-robot-system
#13
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
#14
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...
February 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/27859535/marker-based-technique-for-visualizing-radiolucent-implant-components-in-radiographic-imaging
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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