In vivo estimation of the shoulder joint center of rotation using magneto-inertial sensors: MRI-based accuracy and repeatability assessment

AbstractThe hand-wrist region is reported as the most common injury site in boxing. Boxers are at risk due to the amount of wrist motions when impacting training equipment or their opponents, yet we know relatively little about these motions. This paper describes a new method for quantifying wrist motion in boxing using an electromagnetic tracking system. Surrogate testing procedure utilising a polyamide hand and forearm shape, and in vivo testing procedure utilising 29 elite boxers, were used to assess the accuracy and repeatability of the system. 2D kinematic analysis was used to calculate wrist angles using photogrammetry, whilst the data from the electromagnetic tracking system was processed with visual 3D software. The electromagnetic tracking system agreed with the video-based system (paired t tests) in both the surrogate (< 0.2°) and quasi-static testing (< 6°). Both systems showed a good intraclass coefficient of reliability (ICCs > 0.9). In the punch testing, for both repeated jab and hook shots, the electromagnetic tracking system showed good reliability (ICCs > 0.8) and substantial reliability (ICCs > 0.6) for flexion–extension and radial-ulnar deviation angles, respectively. The results indicate that wrist kinematics during punching activities can be measured using an electromagnetic tracking system.

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An In Vivo 3D Micro-CT Evaluation of Tooth Movement After the Application of Different Force Magnitudes in Rat Molar

The Angle Orthodontist ◽

10.2319/071308-366.1 ◽

2009 ◽

Vol 79 (4) ◽

pp. 703-714 ◽

Cited By ~ 29

Author(s):

Carmen Gonzales ◽

Hitoshi Hotokezaka ◽

Yoshinori Arai ◽

Tadashi Ninomiya ◽

Junya Tominaga ◽

...

Keyword(s):

Tooth Movement ◽

Three Dimensional ◽

Element Model ◽

Longitudinal Change ◽

Micro Ct ◽

Linear Measurements ◽

Center Of Rotation ◽

Ct Evaluation ◽

Space Width

Abstract Objective: To investigate the precise longitudinal change in the periodontal ligament (PDL) space width and three-dimensional tooth movement with continuous-force magnitudes in living rats. Materials and Methods: Using nickel-titanium closed-coil springs for 28 days, 10-, 25-, 50-, and 100-g mesial force was applied to the maxillary left first molars. Micro-CT was taken in the same rat at 0, 1, 2, 3, 10, 14, and 28 days. The width of the PDL was measured in the pressure and tension sides from 0 to 3 days. Angular and linear measurements were used to evaluate molar position at day 0, 10, 14, and 28. The finite element model (FEM) was constructed to evaluate the initial stress distribution, molar displacement, and center of rotation of the molar. Results: The initial evaluation of PDL width showed no statistical differences among different force magnitudes. Tooth movement was registered 1 hour after force application and gradually increased with time. From day 10, greater tooth movement was observed when 10 g of force was applied. The FEM showed that the center of rotation in the molar is located in the center of five roots at the apical third of the molar roots. Conclusion: The rat's molar movement mainly consists of mesial tipping, extrusion of distal roots, intrusion of mesial root, palatal inclination, and mesial rotation. Although the initial tooth movement after the application of different force magnitudes until day 3 was not remarkably different, 10 g of force produced more tooth movement compared with heavier forces at day 28.

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Biceps Detachment Preserves Joint Function in a Chronic Massive Rotator Cuff Tear Rat Model

The American Journal of Sports Medicine ◽

10.1177/0363546518805091 ◽

2018 ◽

Vol 46 (14) ◽

pp. 3486-3494 ◽

Cited By ~ 5

Author(s):

Mengcun Chen ◽

Snehal S. Shetye ◽

Julianne Huegel ◽

Corinne N. Riggin ◽

Daniel J. Gittings ◽

...

Keyword(s):

Rotator Cuff ◽

Shoulder Joint ◽

Shoulder Function ◽

Rotator Cuff Tears ◽

Subscapularis Tendon ◽

Joint Function ◽

Massive Rotator Cuff Tears ◽

Sham Surgery ◽

Biceps Tenotomy

Background: Lesions of the long head of the biceps tendon are often associated with massive rotator cuff tears (MRCTs), and biceps tenotomy is frequently performed for pain relief and functional reservation. However, the efficacy and safety of biceps tenotomy regarding the effects on the surrounding tissues in chronic MRCT are unclear. Hypothesis: Biceps tenotomy would result in improved mechanical and histological properties of the intact subscapularis tendon and improved in vivo shoulder function while not compromising glenoid cartilage properties. Study Design: Controlled laboratory study. Methods: Right supraspinatus and infraspinatus tendons were detached in 25 male Sprague-Dawley rats, followed by 4 weeks of cage activity to create a chronic MRCT condition. Animals were randomly divided into 2 groups and received either biceps tenotomy (n = 11) or sham surgery (n = 14) and were sacrificed 4 weeks thereafter. Forelimb gait and ground-reaction forces were recorded 1 day before the tendon detachment (baseline), 1 day before the surgical intervention (biceps tenotomy or sham), and 3, 7, 10, 14, 21, and 28 days after the intervention to assess in vivo shoulder joint function. The subscapularis tendon and glenoid cartilage were randomly allocated for mechanical testing or histologic assessment after the sacrifice. Results: Compared with sham surgery, biceps tenotomy partially restored the in vivo shoulder joint function, with several gait and ground-reaction force parameters returning closer to preinjury baseline values at 4 weeks. With biceps tenotomy, mechanical properties of the subscapularis tendons were improved, while mechanical properties and histological Mankin scores of the glenoid cartilage were not diminished when compared with the sham group. Conclusion: Biceps tenotomy in the presence of chronic MRCT partially preserves overall shoulder function and potentially restores subscapularis tendon health without causing detrimental effects to joint cartilage. This laboratory study adds to the growing literature regarding the protective effects of biceps tenotomy on the shoulder joint in a chronic MRCT model. Clinical Relevance: This study provides important basic science evidence supporting the use of biceps tenotomy in patients with massive rotator cuff tears.

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Wearable Sensors Integrated with Virtual Reality: A Self-Guided Healthcare System Measuring Shoulder Joint Mobility for Frozen Shoulder

Journal of Healthcare Engineering ◽

10.1155/2019/7681237 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Jianjun Cui ◽

Shih-Ching Yeh ◽

Si-Huei Lee

Keyword(s):

Virtual Reality ◽

Shoulder Joint ◽

Inertial Sensors ◽

Wearable Sensors ◽

Frozen Shoulder ◽

Joint Mobility ◽

Joint Movement ◽

Rehabilitation Process ◽

Shoulder Condition ◽

At Home

Frozen shoulder is a common clinical shoulder condition. Measuring the degree of shoulder joint movement is crucial to the rehabilitation process. Such measurements can be used to evaluate the severity of patients’ condition, establish rehabilitation goals and appropriate activity difficulty levels, and understand the effects of rehabilitation. Currently, measurements of the shoulder joint movement degree are typically conducted by therapists using a protractor. However, along with the growth of telerehabilitation, measuring the shoulder joint mobility on patients’ own at home will be needed. In this study, wireless inertial sensors were combined with the virtual reality interactive technology to provide an innovative shoulder joint mobility self-measurement system that can enable patients to measure their performance of four shoulder joint movements on their own at home. Pilot clinical trials were conducted with 25 patients to confirm the feasibility of the system. In addition, the results of correlation and differential analyses compared with the results of traditional measurement methods exhibited a high correlation, verifying the accuracy of the proposed system. Moreover, according to interviews with patients, they are confident in their ability to measure shoulder joint mobility themselves.

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Evaluation of Anatomical and Functional Hip Joint Center Methods: The Effects of Activity Type, Gender, and Proximal Reference Segment

Journal of Biomechanical Engineering ◽

10.1115/1.4032054 ◽

2015 ◽

Vol 138 (1) ◽

Cited By ~ 3

Author(s):

C. A. McGibbon ◽

J. Fowler ◽

S. Chase ◽

K. Steeves ◽

J. Landry ◽

...

Keyword(s):

Hip Joint ◽

Range Of Movement ◽

Functional Methods ◽

Reference Segment ◽

Movement Type ◽

And Gender ◽

Joint Center ◽

Chair Rise ◽

Hip Joint Center

Accurate hip joint center (HJC) location is critical when studying hip joint biomechanics. The HJC is often determined from anatomical methods, but functional methods are becoming increasingly popular. Several studies have examined these methods using simulations and in vivo gait data, but none has studied high-range of motion activities, such a chair rise, nor has HJC prediction been compared between males and females. Furthermore, anterior superior iliac spine (ASIS) marker visibility during chair rise can be problematic, requiring a sacral cluster as an alternative proximal segment; but functional HJC has not been explored using this approach. For this study, the quality of HJC measurement was based on the joint gap error (JGE), which is the difference in global HJC between proximal and distal reference segments. The aims of the present study were to: (1) determine if JGE varies between pelvic and sacral referenced HJC for functional and anatomical methods, (2) investigate which functional calibration motion results in the lowest JGE and if the JGE varies depending on movement type (gait versus chair rise) and gender, and (3) assess whether the functional HJC calibration results in lower JGE than commonly used anatomical approaches and if it varies with movement type and gender. Data were collected on 39 healthy adults (19 males and 20 females) aged 14–50 yr old. Participants performed four hip “calibration” tests (arc, cross, star, and star-arc), as well as gait and chair rise (activities of daily living (ADL)). Two common anatomical methods were used to estimate HJC and were compared to HJC computed using a published functional method with the calibration motions above, when using pelvis or sacral cluster as the proximal reference. For ADL trials, functional methods resulted in lower JGE (12–19 mm) compared to anatomical methods (13–34 mm). It was also found that women had significantly higher JGE compared to men and JGE was significantly higher for chair rise compared to gait, across all methods. JGE for sacrum referenced HJC was consistently higher than for the pelvis, but only by 2.5 mm. The results indicate that dynamic hip range of movement and gender are significant factors in HJC quality. The findings also suggest that a rigid sacral cluster for HJC estimation is an acceptable alternative for relying solely on traditional pelvis markers.

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G0210104 Knee Joint Center of Rotation Estimation using Inertial Sensor

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2014._g0210104- ◽

2014 ◽

Vol 2014 (0) ◽

pp. _G0210104--_G0210104-

Author(s):

Ryo TAKEDA ◽

Lu YU ◽

Keisuke OKUZUMI ◽

Katsuhiko SASAKI

Keyword(s):

Knee Joint ◽

Inertial Sensor ◽

Center Of Rotation ◽

Joint Center ◽

Rotation Estimation

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IN VIVO SHOULDER JOINT FORCES AT ISOLATED MOTIONS

Journal of Biomechanics ◽

10.1016/s0021-9290(08)70144-1 ◽

2008 ◽

Vol 41 ◽

pp. S144 ◽

Cited By ~ 6

Author(s):

Peter Westerhoff ◽

Antonius Rohlmann ◽

A. Bender ◽

Friedmar Graichen ◽

Georg Bergmann

Keyword(s):

Shoulder Joint ◽

Joint Forces

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Accuracy and Feasibility of Dual Fluoroscopy and Model-Based Tracking to Quantify In Vivo Hip Kinematics During Clinical Exams

Volume 1B: Extremity; Fluid Mechanics; Gait; Growth, Remodeling, and Repair; Heart Valves; Injury Biomechanics; Mechanotransduction and Sub-Cellular Biophysics; MultiScale Biotransport; Muscle, Tendon and Ligament; Musculoskeletal Devices; Multiscale Mechanics; Thermal Medicine; Ocular Biomechanics; Pediatric Hemodynamics; Pericellular Phenomena; Tissue Mechanics; Biotransport Design and Devices; Spine; Stent Device Hemodynamics; Vascular Solid Mechanics; Student Paper and Design Competitions ◽

10.1115/sbc2013-14695 ◽

2013 ◽

Cited By ~ 1

Author(s):

Ashley L. Kapron ◽

Stephen K. Aoki ◽

Christopher L. Peters ◽

Michael J. Bey ◽

Roger Zauel ◽

...

Keyword(s):

Range Of Motion ◽

Motion Artifact ◽

Hip Impingement ◽

Skin Marker ◽

Hip Kinematics ◽

Joint Center ◽

Bony Morphology ◽

Hip Joint Center ◽

Fixed Center

Chondrolabral damage in hips with femoroacetabular impingement (FAI) may result from motion conflict due to abnormal bony morphology. Clinical range of motion and skin-marker motion analysis studies indicate that kinematics are altered in FAI hips, but assessments are limited due to subjective goniometer alignment, skin motion artifact, and imprecise estimations of the hip joint center. Computer simulations of collision between the femur and pelvis suggest that FAI reduces range of motion, but assume a fixed center of rotation and neglect bulk soft tissue restraints. Thus, hip impingement has not been accurately quantified in vivo.

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