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Related Concept Videos

Ultrasonography01:17

Ultrasonography

Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called a...
Muscles of the Shoulder01:23

Muscles of the Shoulder

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...

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Related Experiment Video

Updated: Jul 24, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Image-Based Numerical Analysis for Isolated Type II SLAP Lesions in Shoulder Abduction and External Rotation.

Javier A Maldonado1, Duvert A Puentes2, Ivan D Quintero3

  • 1Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.

Diagnostics (Basel, Switzerland)
|May 27, 2023
PubMed
Summary

An Isolated Type II SLAP lesion in the glenohumeral joint does not significantly deform soft tissues in the anterior capsule during external rotation. This finding suggests minimal biomechanical impact on the anterior bands of the synovial capsule in such injuries.

Keywords:
biomechanicscomputational biomechanicsglenohumeral jointisolated type II SLAPnonsurgical treatment

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Area of Science:

  • Orthopedic biomechanics
  • Shoulder joint anatomy
  • Sports medicine imaging

Background:

  • The glenohumeral joint (GHJ) is crucial for shoulder function.
  • Superior labral anterior to posterior (SLAP) lesions cause joint instability.
  • Isolated Type II SLAP lesions are common, with debated treatment options.

Purpose of the Study:

  • To investigate the biomechanical behavior of anterior glenohumeral joint soft tissues.
  • To analyze the effects of an Isolated Type II SLAP lesion on tissue deformation.
  • To compare the biomechanics of healthy and injured glenohumeral joints under external rotation.

Main Methods:

  • 3D modeling of the shoulder joint using CT-scan and MRI data.
  • Finite element analysis to simulate biomechanical behavior.
  • Validation of the numerical model using ANOVA (p = 0.47).
  • Simulation of an Isolated Type II SLAP lesion and application of 30-degree external rotation.

Main Results:

  • Strain distribution in the anterior bands of the synovial capsule showed no significant difference between healthy and injured models (p = 0.17).
  • The glenohumeral joint exhibited minimal deformation under the tested conditions for an Isolated Type II SLAP lesion.
  • Finite element analysis confirmed the biomechanical stability of the anterior capsule.

Conclusions:

  • Isolated Type II SLAP lesions may not significantly alter the biomechanical behavior of the anterior glenohumeral joint capsule during external rotation.
  • Further research is needed to fully understand the implications of SLAP lesions on shoulder joint stability.
  • These findings contribute to the ongoing debate regarding the treatment of Type II SLAP lesions.