A Development of a System to Measure Radioulnar Distance in Wrist-Joint Rotation Using Three-Dimensional Electromagnetic Sensor

2019 ◽  
Author(s):  
Kouki Nagamune ◽  
Akito Nakano
Keyword(s):  
Wrist Joint ◽  
Three Dimensional ◽  
Joint Rotation ◽  
Electromagnetic Sensor

INTRA-SESSION RELIABILITY AND REPEATABILITY OF KNEE KINEMATICS IN SUBJECTS WITH ACL DEFICIENCY DURING STAIR ASCENT

2017 ◽  
Vol 17 (06) ◽  
pp. 1750092
Author(s):  
MARYAM HAJIZADEH ◽  
ALIREZA HASHEMI OSKOUEI ◽  
FARZAN GHALICHI ◽  
GISELA SOLE
Keyword(s):  
Knee Joint ◽  
Cruciate Ligament ◽  
Intraclass Correlation ◽  
Force Plate ◽  
Three Dimensional ◽  
Knee Kinematics ◽  
Compensatory Mechanisms ◽  
Joint Rotation ◽  
Stair Ascent ◽  
Acl Deficient

Analysis of knee kinematics and ground reaction forces (GRFs) is widely used to determine compensatory mechanisms of people with anterior cruciate ligament deficiency (ACLD). However, the practicality of the measurements is subject to their reliability during different trials. This study aims to determine the reliability and repeatability of knee joint rotations and GRFs in people with ACLD during stair ascent. Eight participants with unilateral ACL-deficient knees performed five trials of stair ascent with each leg. The movements were captured by VICON motion analysis system, and GRF components were recorded using force plate. Three-dimensional tibiofemoral joint rotations were calculated. Intraclass correlation coefficient (ICC), standard error of measurement (SEM) and coefficient of multiple correlation (CMC) were calculated ACL-deficient legs showed lower absolute reliability during swing ([Formula: see text]–6.4) than stance phase ([Formula: see text]–2.2) for knee joint rotations. Moderate to high average measure ICCs (0.59–0.98), relative reliability, were achieved for injured and uninjured sides. The results also demonstrated high repeatability for the knee joint rotation ([Formula: see text]–0.97) and GRF ([Formula: see text]–0.99). The outcomes of this study confirmed the consistency and repeatability of the knee joint rotations and GRFs in ACL-deficient subjects. Additionally, ACL-deficient legs exhibited similar levels of reliability and repeatability compared to contralateral legs.

Three-dimensional kinematics of the lunate, hamate, capitate and triquetrum with type 1 or 2 lunate morphology

2017 ◽  
Vol 43 (4) ◽  
pp. 380-386 ◽  
Author(s):  
Shingo Abe ◽  
Hisao Moritomo ◽  
Kunihiro Oka ◽  
Kazuomi Sugamoto ◽  
Kenji Kasubuchi ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Wrist Flexion ◽  
Ulnar Deviation ◽  
Dart Throwing ◽  
Carpal Kinematics ◽  
Throwing Motion

The purpose of this study was to investigate the differences in three-dimensional carpal kinematics between type 1 and 2 lunates. We studied 15 instances of wrist flexion to extension (nine type 1, six type 2), 13 of radial to ulnar deviation (seven type 1, six type 2), and 12 of dart-throwing motion (six each of type 1 and 2) in 25 normal participants based on imaging with computerized tomography. Mean proximal translation of the distal articular midpoint of the triquetrum relative to type 2 lunates during wrist radioulnar deviation was 2.9 mm (standard deviation (SD) 0.7), which was significantly greater than for type 1 lunates, 1.6 mm (SD 0.6). The hamate contacted the lunate in ulnar deviation and ulnar flexion of wrists with type 2 lunates but not with type 1. We conclude that the four-corner kinematics of the wrist joint are different between type 1 and 2 lunates.

Multibody Analysis and Control of a Full-Wrist Exoskeleton for Tremor Alleviation

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Jiamin Wang ◽  
Oumar R. Barry
Keyword(s):  
Degrees Of Freedom ◽  
Controller Design ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Design Parameters ◽  
Light Power ◽  
Multibody Modeling ◽  
Flexion Extension ◽  
Reliable Performance ◽  
Rotational Joint

Abstract Uncontrollable shaking in the human wrist, caused by pathological tremor, can significantly undermine the power and accuracy in object manipulation. In this paper, the design of a tremor alleviating wrist exoskeleton (TAWE) is introduced. Unlike the works in the literature that only consider the flexion/extension (FE) motion, in this paper, we model the wrist joint as a constrained three-dimensional (3D) rotational joint accounting for the coupled FE and radial/ulnar deviation (RUD) motions. Hence TAWE, which features a six degrees-of-freedom (DOF) rigid linkage structure, aims to accurately monitor, suppress tremors, and provide light-power augmentation in both FE and RUD wrist motions. The presented study focuses on providing a fundamental understanding of the feasibility of TAWE through theoretical analyses. The analytical multibody modeling of the forearm–TAWE assembly provides insight into the necessary conditions for control, which indicates that reliable control conditions in the desired workspace can be acquired by tuning the design parameters. Nonlinear regressions are then implemented to identify the information that is crucial to the controller design from the unknown wrist kinematics. The proposed analytical model is validated numerically with V-REP and the result shows good agreement. Simulations also demonstrate the reliable performance of TAWE under controllers designed for tremor suppression and movement assistance.

Application of a Three-Dimensional Computational Wrist Model to Proximal Row Carpectomy

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Jennifer S. Wayne ◽  
Afsarul Q. Mir
Keyword(s):  
Wrist Joint ◽  
Three Dimensional ◽  
Proximal Row Carpectomy ◽  
Clinical Tool ◽  
Additional Insight ◽  
Bony Anatomy ◽  
Muscle Loading ◽  
Functional Consequences ◽  
Triangular Fibrocartilage ◽  
Insight Into

A three-dimensional (3D) computational model of the wrist examined the biomechanical effects of the proximal row carpectomy (PRC), a surgical treatment of certain wrist degenerative conditions but with functional consequences. Model simulations, replicating the 3D bony anatomy, soft tissue restraints, muscle loading, and applied perturbations, demonstrated quantitatively accurate responses for the decreased motions subsequent to the surgical procedure. It also yielded some knowledge of alterations in radiocarpal contact force which likely increase contact pressure as well as additional insight into the importance of the triangular fibrocartilage complex and retinacular/capsular structures for stabilizing the deficient wrist. As better understanding of the wrist joint is achieved, this model could serve as a useful clinical tool.

scholarly journals A three dimensional model-based simulation of the wrist joint during radioulnar deviation

2015 ◽  
Vol 81 (827) ◽  
pp. 14-00653-14-00653
Author(s):  
Satoshi SHIMAWAKI ◽  
Takushi SHINDO ◽  
Naotaka SAKAI ◽  
Masataka NAKABAYASHI
Keyword(s):  
Wrist Joint ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Model Based

Modeling and Simulation of the Humanoid Massage Robot Arm Based on SolidWorks and ADMAS

2011 ◽  
Vol 101-102 ◽  
pp. 635-639 ◽  
Author(s):  
Zhan Li Wang ◽  
Zai Xiang Pang ◽  
Bang Cheng Zhang ◽  
Zheng Tang Chen ◽  
Yan Qing Jiang
Keyword(s):  
Wrist Joint ◽  
Three Dimensional ◽  
Data Conversion ◽  
Robot Arm ◽  
Design Quality ◽  
Robot System ◽  
Working Mechanism ◽  
Depth Study ◽  
Solid Foundation

The arm is a key component of the humanoid massage robot system. On the basis of in-depth study on massage working mechanism of robot arm, a three dimensional parametric model is structured using SolidWorks. Through data conversion technology, the model is imported into ADAMS, and follow-up constraints and loads are added, with which the kinematics analysis on shoulder, upper arm and wrist joint are completed. It lays a solid foundation for the in-depth study on robot arm of massage working mechanism and the practical application. It can realize the prediction of the massage arm performance on the design phase, simplify the design process and shorten the cycle of the design as well as improve the design quality.

scholarly journals Quantifying the dynamic wing morphing of hovering hummingbird

2017 ◽  
Vol 4 (9) ◽  
pp. 170307 ◽  
Author(s):  
Masateru Maeda ◽  
Toshiyuki Nakata ◽  
Ikuo Kitamura ◽  
Hiroto Tanaka ◽  
Hao Liu
Keyword(s):  
High Speed ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Angle Of Incidence ◽  
Right Wing ◽  
Wing Model ◽  
Upward Direction ◽  
The Right ◽  
Wing Morphing ◽  
Stroke Cycle

Animal wings are lightweight and flexible; hence, during flapping flight their shapes change. It has been known that such dynamic wing morphing reduces aerodynamic cost in insects, but the consequences in vertebrate flyers, particularly birds, are not well understood. We have developed a method to reconstruct a three-dimensional wing model of a bird from the wing outline and the feather shafts (rachides). The morphological and kinematic parameters can be obtained using the wing model, and the numerical or mechanical simulations may also be carried out. To test the effectiveness of the method, we recorded the hovering flight of a hummingbird ( Amazilia amazilia ) using high-speed cameras and reconstructed the right wing. The wing shape varied substantially within a stroke cycle. Specifically, the maximum and minimum wing areas differed by 18%, presumably due to feather sliding; the wing was bent near the wrist joint, towards the upward direction and opposite to the stroke direction; positive upward camber and the ‘washout’ twist (monotonic decrease in the angle of incidence from the proximal to distal wing) were observed during both half-strokes; the spanwise distribution of the twist was uniform during downstroke, but an abrupt increase near the wrist joint was found during upstroke.

A Biomechanical Comparison of the Multisegment and Single Unit Topspin Forehand Drives in Tennis

1989 ◽  
Vol 5 (3) ◽  
pp. 350-364 ◽  
Author(s):  
Bruce Elliott ◽  
Tony Marsh ◽  
Peter Overheu
Keyword(s):  
Single Unit ◽  
High Speed ◽  
High Performance ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Elbow Flexion ◽  
Unit Group ◽  
Transformation Method ◽  
Mean Value ◽  
High Speed Photography

Three-dimensional (3-D) high-speed photography was used to compare different forehand techniques of high performance players. Subjects, who hit a topspin forehand drive with the hitting limb moving almost as a single unit (Gs: single-unit group), were compared with players whose individual segments of the upper limb moved relative to each other (Gm: multisegment group) when playing the same stroke. The Direct Linear Transformation method was used for 3-D space reconstruction from 2-D images recorded from laterally placed phase-locked cameras operating at 200 fps. A third Photosonics camera operating at 100 fps filmed from overhead. Significant differences between the groups were recorded at the shoulder and elbow joints at the completion of the backswing. Maximal elbow joint angular velocities occurred 0.06 sec prior to impact, with the Gm group recording a significantly higher mean value for elbow extension than the Gs group. At impact, however, the Gm group recorded a significantly higher level of elbow flexion than the Gs group and achieved a higher mean angular velocity at the wrist joint than the Gs group. The Gm group recorded a higher racket tip linear velocity at impact and higher postimpact ball velocity when compared to the Gs group. The Gm technique of racket movement produced higher racket and ball velocities for this group of high performance players.

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