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joint position error

Laura Golenia, Marina M Schoemaker, Egbert Otten, Inge Tuitert, Raoul M Bongers
Goal-directed actions become truly functional and skilled when they are consistent yet flexible. In manual pointing, end-effector consistency is characterized by the end position of the index fingertip, whereas flexibility in movement execution is captured by the use of abundant arm-joint configurations not affecting the index finger end position. Because adults have been shown to exploit their system's flexibility in challenging conditions, we wondered whether during middle childhood children are already able to exploit motor flexibility when demanded by the situation...
May 21, 2018: Developmental Psychobiology
Tomoyuki Matsumoto, Naoki Nakano, John E Lawrence, Vikas Khanduja
BACKGROUND: Total knee replacements (TKR) aim to restore stability of the tibiofemoral and patella-femoral joints and provide relief of pain and improved quality of life for the patient. In recent years, computer-assisted navigation systems have been developed with the aim of reducing human error in joint alignment and improving patient outcomes. METHODS: We examined the current body of evidence surrounding the use of navigation systems and discussed their current and future role in TKR...
May 12, 2018: International Orthopaedics
Erjia Zhu, Huikang Xie, Chenyang Dai, Liping Zhang, Yan Huang, Zhengwei Dong, Junhong Guo, Hang Su, Yijiu Ren, Pingfan Shi, Ranran Fu, Shuang Qin, Chunyan Wu, Chang Chen
Invasive adenocarcinoma intraoperatively misdiagnosed as adenocarcinoma in situ or minimally invasive adenocarcinoma is more likely to undergo potentially insufficient resection. The purpose of our study was to evaluate the diagnostic accuracy of frozen section. We retrospectively reviewed 1,111 lung adenocarcinomas from January to March 2016 to evaluate the diagnostic performance of frozen section. A derivation cohort consisting of 436 cases of adenocarcinoma in situ or minimally invasive adenocarcinoma diagnosed by frozen section in the same period were analyzed to find predictive factors for invasive adenocarcinoma as the final diagnosis...
May 11, 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
Zhiwei Wang, Chaoyue Liu, Danpeng Cheng, Liang Wang, Xin Yang, Kwang-Ting Cheng
Automated methods for detecting clinically significant (CS) prostate cancer (PCa) in multi-parameter magnetic resonance images (mp-MRI) are of high demand. Existing methods typically employ several separate steps, each of which is optimized individually without considering the error tolerance of other steps. As a result, they could either involve unnecessary computational cost or suffer from errors accumulated over steps. In this paper, we present an automated CS PCa detection system, where all steps are optimized jointly in an end-to-end trainable deep neural network...
May 2018: IEEE Transactions on Medical Imaging
D I Réfy, M Brix, R Gomes, B Tál, S Zoletnik, D Dunai, G Kocsis, S Kálvin, T Szabolics
Diagnostic alkali atom (e.g., lithium) beams are routinely used to diagnose magnetically confined plasmas, namely, to measure the plasma electron density profile in the edge and the scrape off layer region. A light splitting optics system was installed into the observation system of the lithium beam emission spectroscopy diagnostic at the Joint European Torus (JET) tokamak, which allows simultaneous measurement of the beam light emission with a spectrometer and a fast avalanche photodiode (APD) camera. The spectrometer measurement allows density profile reconstruction with ∼10 ms time resolution, absolute position calculation from the Doppler shift, spectral background subtraction as well as relative intensity calibration of the channels for each discharge...
April 2018: Review of Scientific Instruments
Kan Liu, Jun Fu, Baozhan Yu, Wei Sun, Jiying Chen, Libo Hao
Periprosthetic joint infection (PJI) is a catastrophic complication following total joint arthroplasty. Until now, the diagnosis of PJI is still confronted with difficulties, which is characterized by technical limitations. The question of whether sonication fluid PCR can provide high value in the diagnosis of PJI remains unanswered. This meta-analysis included 9 studies that evaluated PCR assays of sonication fluid for the diagnosis of PJI. The pooled sensitivity, specificity, Positive likelihood ratio (PLR), Negative likelihood ratio (NLR) and Diagnostic odds ratio (DOR) were 0...
2018: PloS One
Kai Lon Fok, Jae Lee, Albert H Vette, Kei Masani
BACKGROUND: Many postural control studies employ a single-mass inverted pendulum model (IPM) to represent the body during standing. However, it is not known to what degree and for what conditions the model's kinematic assumptions are valid. RESEARCH QUESTION: Our first objective was to quantify the IPM error, corresponding to a distance change between the ankle joint and center of mass (COM) during unrestricted, natural, unperturbed standing. A second objective was to quantify the error of having the ankle joint angle represent the COM angle...
April 18, 2018: Gait & Posture
Shaowei Yao, Yu Zhuang, Zhijun Li, Rong Song
Various rehabilitation robots have been employed to recover the motor function of stroke patients. To improve the effect of rehabilitation, robots should promote patient participation and provide compliant assistance. This paper proposes an adaptive admittance control scheme (AACS) consisting of an admittance filter, inner position controller, and electromyography (EMG)-driven musculoskeletal model (EDMM). The admittance filter generates the subject's intended motion according to the joint torque estimated by the EDMM...
2018: Frontiers in Neurorobotics
Ashish Kumar, Manjeet Kumar, Rama Komaragiri
Bradycardia can be modulated using the cardiac pacemaker, an implantable medical device which sets and balances the patient's cardiac health. The device has been widely used to detect and monitor the patient's heart rate. The data collected hence has the highest authenticity assurance and is convenient for further electric stimulation. In the pacemaker, ECG detector is one of the most important element. The device is available in its new digital form, which is more efficient and accurate in performance with the added advantage of economical power consumption platform...
April 19, 2018: Journal of Medical Systems
Yangqing Deng, Wei Pan
Due to issues of practicality and confidentiality of genomic data-sharing on a large scale, typically only meta- or mega-analyzed GWAS summary data, not individual-level data, are publicly available. Re-analyses of such GWAS summary data for a wide range of applications have become more and more common and useful, which often require the use of an external reference panel with individual-level genotypic data to infer linkage disequilibrium (LD) among genetic variants. However, with a small sample size in only hundreds, as for the most popular 1000 Genomes Project European sample, estimation errors for LD are not negligible, leading to often dramatically increased numbers of false positives in subsequent analyses of GWAS summary data...
April 19, 2018: Genetics
Bartłomiej Niespodziński, Andrzej Kochanowicz, Jan Mieszkowski, Elżbieta Piskorska, Małgorzata Żychowska
The aims of this study were (1) to assess the relationship between joint position (JPS) and force sense (FS) and muscle strength (MS) and (2) to evaluate the impact of long-term gymnastic training on particular proprioception aspects and their correlations. 17 elite adult gymnasts and 24 untrained, matched controls performed an active reproduction (AR) and passive reproduction (PR) task and a force reproduction (FR) task at the elbow joint. Intergroup differences and the relationship between JPS, FS, and MS were evaluated...
2018: BioMed Research International
Jie Zhou, Yan Liang, Qiang Shen, Xiaoxue Feng, Quan Pan
A biomimetic distributed infection-immunity model (BDIIM), inspired by the immune mechanism of an infected organism, is proposed in order to achieve a high-efficiency wake-up control strategy based on multi-sensor fusion for target tracking. The resultant BDIIM consists of six sub-processes reflecting the infection-immunity mechanism: occurrence probabilities of direct-infection (DI) and cross-infection (CI), immunity/immune-deficiency of DI and CI, pathogen amount of DI and CI, immune cell production, immune memory, and pathogen accumulation under immunity state...
April 18, 2018: Sensors
Yuichi Kuroda, Koji Takayama, Kazunari Ishida, Shinya Hayashi, Shingo Hashimoto, Masanori Tsubosaka, Takehiko Matsushita, Takahiro Niikura, Kotaro Nishida, Ryosuke Kuroda, Tomoyuki Matsumoto
PURPOSE: This study aimed to determine the correlation between the change in joint line height calculated from the resected bone and insert thickness during surgery and the change in limb alignment following unicompartmental knee arthroplasty (UKA). It was hypothesized that joint line elevation is correlated with the change in limb alignment. METHODS: A total of 74 consecutive patients diagnosed with either isolated medial compartmental osteoarthritis (38 patients) or spontaneous osteonecrosis of the knee (36 patients) were included...
April 16, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Liam Newton, Steve McCaig
OBJECTIVE: To assess the effects of a cricket fielding session, at an identified throwing injury risk workload, on shoulder joint position sense (JPS) and active range of motion (AROM) in cricketers. DESIGN: Repeated measures observational study. SETTING: Indoor cricket centre. PARTICIPANTS: Nineteen, asymptomatic University cricketers. MAIN OUTCOME: AROM was assessed supine at 90° abduction and from this 10% off end range IR and ER was used as the position matching angle to assess JPS...
April 4, 2018: Physical Therapy in Sport
Yonggang Wang, Linchao Li, Carlo G Prato
Although the taxi industry is playing an important role in Chinese everyday life, little attention has been posed towards occupational health issues concerning the taxi drivers' working conditions, driving behaviour and road safety. A cross-sectional survey was administered to 1021 taxi drivers from 21 companies in four Chinese cities and collected information about (i) sociodemographic characteristics, (ii) working conditions, (iii) frequency of daily aberrant driving behaviour, and (iv) involvement in property-damage-only (PDO) and personal injury (PI) crashes over the past two years...
April 3, 2018: Accident; Analysis and Prevention
Mark P Pallis, David N Pressman, Kenneth Heida, Tyler Nicholson, Susan Ishikawa
BACKGROUND: Anatomic reduction and fixation of the syndesmosis in traumatic injuries is paramount in restoring function of the tibiotalar joint. While overcompression is a potential error, recent work has called into question whether ankle position during fixation really matters in this regard. Our study aimed to corroborate more recent findings using a fracture model that, to our knowledge, has not been previously tested. METHODS: Twenty cadaver leg specimens were obtained and prepared...
March 1, 2018: Foot & Ankle International
Mariusz P Furmanek, Kajetan J Słomka, Andrzej Sobiesiak, Marian Rzepko, Grzegorz Juras
The proprioceptive information received from mechanoreceptors is potentially responsible for controlling the joint position and force differentiation. However, it is unknown whether cryotherapy influences this complex mechanism. Previously reported results are not universally conclusive and sometimes even contradictory. The main objective of this study was to investigate the impact of local cryotherapy on knee joint position sense (JPS) and force production sense (FPS). The study group consisted of 55 healthy participants (age: 21 ± 2 years, body height: 171...
March 2018: Journal of Human Kinetics
(no author information available yet)
Purpose: Uncertainties related to geometric distortion are a major obstacle for effectively utilizing MRI in radiation oncology. We aim to quantify the geometric distortion in patient images by comparing their in-treatment position MRIs with the corresponding planning CTs, using CT as the non-distorted gold standard. Methods: Twenty-one head and neck cancer patients were imaged with MRI as part of a prospective Institutional Review Board approved study. MR images were acquired with a T2 SE sequence (0...
December 2017: Clinical and Translational Radiation Oncology
Ángel Pérez-Silvestre, Daniel Albert-Lucena, Guido F Gómez-Chiguano, Gustavo Plaza-Manzano, Daniel Pecos-Martín, Tomás Gallego-Izquierdo, Patricia Martín-Casas, Natalia Romero-Franco
BACKGROUND: Proprioception and vertical jump are important parameters in the performance and prevention of injuries in futsal. However, very few studies have analyzed the role of multi-station exercises to improve these variables. The purpose of this study was to assess the effects of a six-week multi-station exercise program on knee joint position sense (JPS) and countermovement jump (CMJ) of futsal players. METHODS: Thirty-four male futsal players randomly classified into experimental (n = 17) or control group (n = 17)...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
B de Saint Vincent, H Migaud, E Senneville, C Loiez, G Pasquier, J Girard, S Putman
BACKGROUND: Joint aspiration is currently the reference standard test for diagnosing periprosthetic joint infection (PJI) despite the high rate of false-negative results, of which a major cause is the fastidious nature of some micro-organisms. A rapid diagnostic test that detects alpha defensin (Synovasure™, Zimmer, Warsaw, IN, USA) in joint fluid can provide the diagnosis of PJI within a few minutes across the full spectrum of causative organisms (including mycobacteria and yeasts)...
March 23, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
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