Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Muscles that Move the Arm01:31

Muscles that Move the Arm

1.7K
Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...
1.7K
Muscles of the Shoulder01:23

Muscles of the Shoulder

3.8K
The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
3.8K
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

286
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
286
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

187
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
187
Stresses in a Shaft01:18

Stresses in a Shaft

373
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
373
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

174
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
174

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The Effect of Ergonomic Optimization on Shoulder and Neck Mechanics and Symptoms During Simulated Ureteroscopy.

Urology·2026
Same author

Grit is not associated with opioid consumption patterns in patients that undergo arthroscopic rotator cuff repair.

JSES international·2026
Same author

SSNA1 mechanically reinforces the damaged microtubule lattice.

bioRxiv : the preprint server for biology·2026
Same author

Cell Surface Vimentin Is an Attachment Factor That Facilitates Equine Arteritis Virus Infection In Vitro.

Viruses·2026
Same author

Longitudinal analysis of rotator cuff repair: joint kinematics and clinical outcomes.

JSES international·2026
Same author

Comparison of glenohumeral joint kinematics between swimmers clinically classified with multidirectional instability and asymptomatic controls.

PloS one·2025

Related Experiment Video

Updated: Jul 1, 2025

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
10:07

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Published on: February 10, 2015

19.3K

Effects of Scapular Angular Deviations on Potential for Rotator Cuff Tendon Mechanical Compression.

Rebekah L Lawrence1,2, Laura B Richardson3, Hannah L Bilodeau3

  • 1Program in Physical Therapy, Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA.

Orthopaedic Journal of Sports Medicine
|March 4, 2024
PubMed
Summary

Scapular upward rotation reduction decreases rotator cuff impingement risk at 120° arm elevation. Deviations in scapular motion significantly impact rotator cuff tendon proximity, informing clinical decisions for impingement syndrome.

Keywords:
kinematicsmechanical impingementrotator cuffscapula

More Related Videos

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

3.1K
Author Spotlight: Unraveling the Mechanobiology of Tendon Impingement – A Multiaxial Murine Hind Limb Explant Model
08:19

Author Spotlight: Unraveling the Mechanobiology of Tendon Impingement – A Multiaxial Murine Hind Limb Explant Model

Published on: December 8, 2023

959

Related Experiment Videos

Last Updated: Jul 1, 2025

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
10:07

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Published on: February 10, 2015

19.3K
Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

3.1K
Author Spotlight: Unraveling the Mechanobiology of Tendon Impingement – A Multiaxial Murine Hind Limb Explant Model
08:19

Author Spotlight: Unraveling the Mechanobiology of Tendon Impingement – A Multiaxial Murine Hind Limb Explant Model

Published on: December 8, 2023

959

Area of Science:

  • Biomechanics of the shoulder joint.
  • Musculoskeletal modeling and simulation.

Background:

  • Rotator cuff disease may stem from impaired scapular motion, leading to compression and degeneration.
  • Scapular dyskinesia is implicated in the progression of rotator cuff pathology.

Purpose of the Study:

  • To model the impact of scapular angular deviations on rotator cuff tendon proximity.
  • To assess the risk of subacromial and internal impingement during arm abduction.

Main Methods:

  • 3D CT models of asymptomatic and symptomatic shoulders were used.
  • Scapular orientations were simulated with incremental deviations in rotation and tilt.
  • Minimum distances between rotator cuff insertions and impinging structures were calculated.

Main Results:

  • Reduced upward scapular rotation decreased rotator cuff-glenoid distance at 120° elevation.
  • Significant increases in tendon proximity to the acromion/coracoacromial ligament were observed with deviations at lower angles.

Conclusions:

  • Scapular upward rotation plays a critical role in maintaining rotator cuff space at higher arm elevations.
  • Understanding scapular movement deviations is crucial for managing rotator cuff pathology and impingement syndrome.