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https://www.readbyqxmd.com/read/28922423/proprioception-in-patients-with-posterior-cruciate-ligament-tears-a-meta-analysis-comparison-of-reconstructed-and-contralateral-normal-knees
#1
Jung-Ro Yoon, Dae-Hee Lee, Seung-Nam Ko, Young-Soo Shin
Posterior cruciate ligament (PCL) reconstruction for patients with PCL insufficiency has been associated with postoperative improvements in proprioceptive function due to mechanoreceptor regeneration. However, it is unclear whether reconstructed PCL or contralateral normal knees have better proprioceptive function outcomes. This meta-analysis was designed to compare the proprioceptive function of reconstructed PCL or contralateral normal knees in patients with PCL insufficiency. All studies that compared proprioceptive function, as assessed with threshold to detect passive movement (TTDPM) or joint position sense (JPS) in PCL reconstructed or contralateral normal knees were included...
2017: PloS One
https://www.readbyqxmd.com/read/28904099/spasticity-may-obscure-motor-learning-ability-after-stroke
#2
Sandeep K Subramanian, Anatol G Feldman, Mindy F Levin
Previous motor learning studies based on adapting movements of the hemiparetic arm in stroke subjects have not accounted for spasticity occurring in specific joint ranges (spasticity zones), resulting in equivocal conclusions about learning capacity. We compared the ability of participants with stroke to rapidly adapt elbow extension movements to changing external load conditions outside and inside spasticity zones. Participants with stroke (n=12, aged: 57.8±9.6 years) and healthy age-matched controls (n=8, 63...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28895040/clinical-utility-of-ultra-low-dose-pre-test-exposure-to-avoid-unnecessary-patient-exposure-due-to-positioning-errors-a-simulation-study
#3
Hideo Nose, Junji Shiraishi
The use of digital radiographic systems has decreased the frequency of image retakes due to over/underexposure in general radiography. However, image retakes owing to patient positioning errors are likely to increase because of the convenience of a real-time image check on a console table. The purpose of the present study is to propose a novel radiographic examination procedure with an ultra-low-dose pre-test exposure that may be utilized to check patient positioning prior to taking an actual image, thereby reducing unnecessary patient exposure owing to image retakes...
September 11, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28888740/can-the-hip-joint-center-be-estimated-from-pelvic-dimensions-in-dysplastic-hips
#4
Masanori Fujii, Tetsuro Nakamura, Toshihiko Hara, Yasuharu Nakashima
BACKGROUND: We aimed to determine correlations between the hip joint center position and pelvic dimensions and whether the three-dimensional position of the original hip joint center could be estimated from pelvic landmarks in dysplastic and normal hips. METHODS: We reviewed the pelvic CT scans of 70 patients (70 hips) with hip dysplasia. Seventy-seven normal hips were used as controls. The hip joint center coordinates (Cx, Cy, and Cz) and pelvic dimensions were measured with reference to the anterior pelvic plane coordinate system...
September 6, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28885964/cervical-joint-position-sense-in-hypobaric-conditions-a-randomized-double-blind-controlled-trial
#5
Diana Bagaianu, Damien Van Tiggelen, N Duvigneaud, Veerle Stevens, Danny Schroyen, Dirk Vissenaeken, Gino D'Hondt, Laurent Pitance
Well-adapted motor actions require intact and well-integrated information from all of the sensory systems, specifically the visual, vestibular, and somatosensory systems, including proprioception. Proprioception is involved in the sensorimotor control by providing the central nervous system with an updated body schema of the biomechanical and spatial properties of the body parts. With regard to the cervical spine, proprioceptive information from joint and muscle mechanoreceptors is integrated with vestibular and visual feedback to control head position, head orientation, and whole body posture...
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28877592/the-optimal-location-to-measure-scapholunate-diastasis-on-screening-radiographs
#6
Joseph Said, Kevin Baker, Laviel Fernandez, David E Komatsu, Elaine Gould, Lawrence C Hurst
BACKGROUND: Lack of a universally accepted location and normal value limits the utility of measuring scapholunate diastasis. The primary purpose of this study was to define the optimal location to measure the scapholunate gap throughout sequential ligament transections. Secondary purposes were to compare plain radiographs with fluoroscopy and to evaluate interrater reliability in measuring scapholunate diastasis. METHODS: Five cadaver forearms were imaged with intact carpal ligaments and after sequentially transecting the scapholunate, radioscaphocapitate, and scaphotrapezium-trapezoid ligaments...
September 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28861461/verifying-heisenberg-s-error-disturbance-relation-using-a-single-trapped-ion
#7
Fei Zhou, Leilei Yan, Shijie Gong, Zhihao Ma, Jiuzhou He, Taiping Xiong, Liang Chen, Wanli Yang, Mang Feng, Vlatko Vedral
Heisenberg's uncertainty relations have played an essential role in quantum physics since its very beginning. The uncertainty relations in the modern quantum formalism have become a fundamental limitation on the joint measurements of general quantum mechanical observables, going much beyond the original discussion of the trade-off between knowing a particle's position and momentum. Recently, the uncertainty relations have generated a considerable amount of lively debate as a result of the new inequalities proposed as extensions of the original uncertainty relations...
October 2016: Science Advances
https://www.readbyqxmd.com/read/28842089/experimental-comparison-of-the-clinical-measurement-of-ankle-joint-dorsiflexion-and-radiographic-tibiotalar-position
#8
Paul Dayton, Mindi Feilmeier, Kalani Parker, Riane Otti, Rachel Reimer, Merrell Kauwe, Jake Eisenschink, Joshua Wolfe
Clinical measurement of ankle dorsiflexion is typically used to diagnose limited ankle range of motion. Controversy and a lack of clarity continue regarding the most accurate clinical method of measuring ankle joint dorsiflexion and the effect that the foot position (supinated, neutral, pronated) has on the true tibiotalar position. We investigated the effects of supinated, neutral and pronated foot positions on the clinical dorsiflexion measurements in 50 healthy subjects and compared these results to the radiographic measurement of tibiotalar joint position with the ankle maximally dorsiflexed in each of the 3 foot positions...
September 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28829277/no-relationship-between-joint-position-sense-and-force-sense-at-the-shoulder
#9
David Phillips, Andrew Karduna
In practice, a single test is used to quantify an individual's proprioception. Previous studies have not found a correlation between joint position sense (JPS) and force sense (FS), which are submodalities of proprioception. The purpose of the present study is to determine if root mean square (RMS) error in JPS and FS are related at the shoulder, controlling for external load and elevation angle. Active shoulder angle and force reproduction protocols were performed. No correlation was found between JPS and FS (r = -...
August 22, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/28814022/estimating-anatomical-wrist-joint-motion-with-a-robotic-exoskeleton
#10
Chad G Rose, Claudia K Kann, Ashish D Deshpande, Marcia K O'Malley
Robotic exoskeletons can provide the high intensity, long duration targeted therapeutic interventions required for regaining motor function lost as a result of neurological injury. Quantitative measurements by exoskeletons have been proposed as measures of rehabilitative outcomes. Exoskeletons, in contrast to end effector designs, have the potential to provide a direct mapping between human and robot joints. This mapping rests on the assumption that anatomical axes and robot axes are aligned well, and that movement within the exoskeleton is negligible...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814002/joint-based-velocity-feedback-to-virtual-limb-dynamic-perturbations
#11
Eric J Earley, Kyle J Kaveny, Reva E Johnson, Levi J Hargrove, Jon W Sensinger
Despite significant research developing myoelectric prosthesis controllers, many amputees have difficulty controlling their devices due in part to reduced sensory feedback. Many attempts at providing supplemental sensory feedback have not significantly aided control. We hypothesize this is because the feedback provided contains redundant information already provided by vision. However, whereas vision provides egocentric, position-based feedback, sensory feedback tied to joint coordinates may provide information complementary to vision...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28809639/the-effect-of-incorrect-foot-placement-on-the-accuracy-of-radiographic-measurements-of-the-hallux-valgus-and-inter-metatarsal-angles-for-treating-hallux-valgus
#12
E Kuyucu, H H Ceylan, S Surucu, I Erdil, A Kara, B G Gulenc, M Bulbul, M Erdil
PURPOSE OF THE STUDY Accurate radiographic measurements are crucial in treating hallux valgus (HV). This three-dimensional deformity should not be evaluated from one joint on one plane. However, in practice, surgeons measure the deformity only on transverse dorsoplantar radiographs. We determined the amount of error associated with positioning the foot incorrectly on radiographs. MATERIAL AND METHODS To simulate incorrect positions of the foot in radiographic evaluation, we designed an angled device that can move in transverse and frontal plane...
2017: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
https://www.readbyqxmd.com/read/28800305/influence-of-chronic-neck-pain-on-cervical-joint-position-error-jpe-comparison-between-young-and-elderly-subjects
#13
Khalid A Alahmari, Ravi Shankar Reddy, Paul Silvia, Irshad Ahmad, Venkat Nagaraj, Mohammad Mahtab
BACKGROUND: Evaluation of cervical joint position sense in subjects with chronic neck pain has gained importance in recent times. Different authors have established increased joint position error (JPE) in subjects with acute neck pain. However, there is a paucity of studies to establish the influence of chronic neck pain on cervical JPE. OBJECTIVE: The objective of the study was to understand the influence of chronic neck pain on cervical JPE, and to examine the differences in cervical JPE between young and elderly subjects with chronic neck pain...
August 3, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28799866/proprioception-and-flexibility-profiles-of-elite-synchronized-swimmers
#14
Nora M Y Cho, Hedda P Giorgi, Karen P Y Liu, Young-Hyeon Bae, Louisa M Y Chung, Kitchana Kaewkaen, Shirley S M Fong
This study compared the full-body flexibility and joint proprioception (on land and underwater) of (a) 20 elite female synchronized swimmers (mean age ± standard deviation = 18.5 ± 1.9 years) and (b) 20 college female swim team members with no training in synchronized swimming (control participants; mean age ± standard deviation = 20.6 ± 1.3 years). Flexibility of the trunk and upper and lower limbs was measured using plastic tape and a goniometer, respectively. Joint proprioception (joint position sense) of the upper and lower limbs on land and underwater was measured by an active joint angle repositioning test...
January 1, 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28749839/angle-to-angle-mandibular-defect-reconstruction-with-fibula-flap-by-using-a-mandibular-fixation-device-and-surgical-navigation
#15
Shi-Yue Shen, Yao Yu, Wen-Bo Zhang, Xiao-Jing Liu, Xin Peng
PURPOSE: Although free fibula flaps are widely used for mandibular reconstruction, 3-dimensional (3D) position is difficult to control in angle-to-angle mandibular defects. The present study describes a revised approach for angle-to-angle mandibular reconstruction with fibula flaps by using mandibular fixation device and surgical navigation. METHODS: Preoperative maxillofacial and fibular computed tomography (CT) scans were acquired, and CT data were imported into ProPlan CMF software...
September 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28744040/an-estimation-of-knee-and-ankle-joint-angles-during-extension-phase-of-standing-up-motion-performed-using-an-inertial-sensor
#16
Fang Jin, Takayuki Nagasaki, Chikamune Wada
[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle measurements by combining the angle and acceleration of the trunk, based on readings from the inertial sensor attachment on the subject's chest, during the extension phase...
July 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28730921/kinematic-repeatability-of-a-multi-segment-foot-model-for-dance
#17
Sarah L Carter, Nahoko Sato, Luke S Hopper
The purpose of this study was to determine the intra and inter-assessor repeatability of a modified Rizzoli Foot Model for analysing the foot kinematics of ballet dancers. Six university-level ballet dancers performed the movements; parallel stance, turnout plié, turnout stance, turnout rise and flex-point-flex. The three-dimensional (3D) position of individual reflective markers and marker triads was used to model the movement of the dancers' tibia, entire foot, hindfoot, midfoot, forefoot and hallux. Intra and inter-assessor reliability demonstrated excellent (ICC ≥ 0...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28726074/error-performances-of-a-model-based-biplane-fluoroscopic-system-for-tracking-knee-prosthesis-during-treadmill-gait-task
#18
Arnaud Barré, Kamiar Aminian
Roentgen stereophotogrammetry analysis technique allows an accurate measurement of knee joint prosthesis position and orientation using two X-ray images. Although this technique is used generally during static procedure, it is possible to use it with a biplane fluoroscopic system to measure the prosthesis kinematics during functional tasks (e.g., gait, squat, jump) performed in a laboratory environment. However, the performance of the system in terms of errors for the measurements and the model-based matching algorithm are not well known for dynamic tasks such as walking...
July 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28712529/dynamic-simulation-of-knee-joint-loading-during-gait-using-force-feedback-control-and-surrogate-contact-modelling
#19
Jonathan P Walter, Marcus G Pandy
The aim of this study was to perform multi-body, muscle-driven, forward-dynamics simulations of human gait using a 6-degree-of-freedom (6-DOF) model of the knee in tandem with a surrogate model of articular contact and force control. A forward-dynamics simulation incorporating position, velocity and contact force-feedback control (FFC) was used to track full-body motion capture data recorded for multiple trials of level walking and stair descent performed by two individuals with instrumented knee implants. Tibiofemoral contact force errors for FFC were compared against those obtained from a standard computed muscle control algorithm (CMC) with a 6-DOF knee contact model (CMC6); CMC with a 1-DOF translating hinge-knee model (CMC1); and static optimization with a 1-DOF translating hinge-knee model (SO)...
July 13, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28711665/ancient-mitochondrial-pseudogenes-reveal-hybridization-between-distant-lineages-in-the-evolution-of-the-rupicapra-genus
#20
T Pérez, F Rodríguez, M Fernández, J Albornoz, A Domínguez
Mitochondrial pseudogenes (numts) inserted in the nuclear genome are frequently found in population studies. Its presence is commonly connected with problems and errors when they are confounded with true mitochondrial sequences. In the opposite side, numts can provide valuable phylogenetic information when they are copies of ancient mitochondrial lineages. We show that Rupicapra individuals of different geographic origin from the Cantabrian Mountains to the Apennines and the Caucasus share a nuclear COI fragment...
July 12, 2017: Gene
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