1A2-G10 Development of a Shoulder Joint Support Equipment Based on Scapula Motion Analysis : A Scapula Motion Model

High rotational torques during baseball pitching are believed to be linked to most overuse injuries at the shoulder. This study investigated the effects of trunk rotation on shoulder rotational torques during pitching. A total of 38 pitchers from the professional, college, high school, and youth ranks were recruited for motion analysis. Professional pitchers demonstrated the least amount of rotational torque (p= .001) among skeletally mature players, while exhibiting the ability to rotate their trunks significantly later in the pitching cycle, as compared to other groups (p= .01). It was concluded that the timing of their rotation was optimized as to allow the throwing shoulder to move with decreased joint loading by conserving the momentum generated by the trunk. These results suggest that a specific pattern in throwing can be utilized to increase the efficiency of the pitch, which would allow a player to improve performance with decreased risk of overuse injury.

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Validation of Functional Methods for Calculating Shoulder Joint Centers Using 3D Motion Analysis

Volume 2: Biomedical and Biotechnology Engineering ◽

10.1115/imece2010-40386 ◽

2010 ◽

Cited By ~ 2

Author(s):

Derek J. Lura ◽

Stephanie L. Carey ◽

Rajiv V. Dubey

Keyword(s):

Range Of Motion ◽

Motion Analysis ◽

Hip Joint ◽

Gradient Method ◽

Shoulder Joint ◽

Analysis Data ◽

3D Motion Analysis ◽

Functional Methods ◽

Joint Center ◽

Hip Joint Center

Research in upper body kinematics and kinetics requires accurate estimation of anatomical joints. Currently the use of regressive techniques using anatomical landmarks is the most common way of calculating upper limb joint centers. Research has shown that functional joint center methods can produce more accurate results than traditional regressive methods in the estimation of hip joint center. This paper investigates the use of functional methods for the estimation of the shoulder joint center using 3D motion analysis data. Three methods for calculating the functional joint center were tested: 1) a standard sphere fit regression, 2) a regression developed and tested for use finding the hip joint center (Piazza method) [1], and 3) a gradient method developed for this paper similar to the one used by Schonauer [2]. First the functional joint center methods were tested in MATLAB using data with random points rotating around a known joint center with varying amounts of noise. Using the MATLAB calculations the accuracy and repeatability of each method was analyzed. Functional joint centers were then calculated from two sets of motion analysis data. The first data set contained shoulder range of motion data, and the second set was gathered during activities of daily living (ADL). Both motion analysis sets used data collected from a healthy adult male subject using a Vicon motion analysis system. The repeatability of each method using the motion analysis data was then analyzed. The MATLAB tests show that the gradient method has the highest tolerance to noise in the data. Results from the motion analysis test show that, of the methods tested, no functional method was found to have consistent results for individual tasks. Each of the functional methods requires a range of motion not prevalent in most ADLs in order to generate a reliable joint center. Joint centers calculations improved in accuracy and reliability with a greater number of trials and larger range of motion. The functional methods are suitable for use in future studies that include a large range of motion.

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Simulator Based Experimental Motion Analysis of 3D Printed Artificial Shoulder Joint Geometries

10.29007/4vgs ◽

2018 ◽

Author(s):

Nad Siroros ◽

Mark Verjans ◽

Klaus Radermacher ◽

Jörg Eschweiler

Keyword(s):

Motion Analysis ◽

Humeral Head ◽

Shoulder Joint ◽

Glenohumeral Joint ◽

External Rotation ◽

Initial Study ◽

Biomechanical Behavior ◽

Pneumatic Muscles ◽

Main Component ◽

The Impact

The glenohumeral joint is an important joint with large mobility of the human upperextremity. In shoulder arthroplasty patients often has an unsatisfactory outcome. In order to understand the biomechanical complexity of the shoulder, a novel computer controlled experimental shoulder simulator with an innovative muscle control were constructed. The main component of the simulator includes the active pneumaticmuscles to replicatethe deltoid and the rotator-cuff function and two springs as passive muscle. The aim of this study is to evaluate the impact of a variation of shoulder joint geometries on shoulder biomechanics in the basis of motion analysis. The radius of the glenoid cavity varied from 28-33mm with 2.5mm increment while the radius the humeral head are varied from 20.1-25.1 with 2.5mm increment. The “teach-in” function of the simulator allows an operator to assign the movement to the simulator where the lengths of the pneumatic muscles are recorded. Then the simulator repeats the assigned movement according to the recorded muscles length. The daily living activities includes abduction/adduction, internal/external rotation with adducted arm, and circumduction. The results show promising repeatability of the simulator with minor deviation. However, damage on the surface of the humeral head has been found which should be further studied for both shoulder behavior investigation and the shoulder simulator optimization. Therefore, this study is a decent initial study toward the verification of the simulator and lead to a better understanding of shoulder biomechanical behavior to cope with the clinical problems in the future.

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2A2-E02 Development of a Shoulder Joint Teach Equipment Based on Scapula Motion Analysis : Examination for Validity of Model Force Analysis of Shoulder Muscles by Three-Dimensional Model(Musculoskeletal Modeling)

The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) ◽

10.1299/jsmermd.2012._2a2-e02_1 ◽

2012 ◽

Vol 2012 (0) ◽

pp. _2A2-E02_1-_2A2-E02_3

Author(s):

Yudai KITANO ◽

Kazutaka YOKOTA

Keyword(s):

Motion Analysis ◽

Shoulder Joint ◽

Three Dimensional ◽

Musculoskeletal Modeling ◽

Force Analysis ◽

Dimensional Model ◽

Three Dimensional Model ◽

Shoulder Muscles

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Motion Analysis of Ball Grinder with Dual-Rotating Plates Lapping Mode

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.416.295 ◽

2009 ◽

Vol 416 ◽

pp. 295-299

Author(s):

Yang Fu Jin ◽

Xun Lv ◽

Xiao Dong Hu ◽

Wei Li

Keyword(s):

Motion Analysis ◽

Spin Axis ◽

Motion Model ◽

Spin Speed ◽

Revolution Speed ◽

New Type ◽

Motion Parameters ◽

Rotating Plates ◽

Ball Motion

Dual-rotating plates lapping method is a new type of ball machining technology, in which the spin axis angle of the ball could wiggle up to 180°. An investigation was made to verify the motion model of the dual-rotating plates lapping. The ball motion parameters, such as revolution speed, spin speed and spin axis angle were detected experimentally. The results show that the calculated values and the measured ones of the ball motion parameters are almost identical. The motion model of the dual-rotating plates lapping method is thus verified valid.

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