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Related Concept Videos

Muscles that Move the Arm01:31

Muscles that Move the Arm

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...
Anatomical Movements00:51

Anatomical Movements

Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints.
Here are some common anatomical movements:
Flexion and extension motions are in the sagittal (anterior–posterior) plane of motion. These movements take place at the shoulder, hip, elbow, knee, wrist, metacarpophalangeal,...
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...
Bones of the Upper Limb: Humerus01:19

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...

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Related Experiment Video

Updated: Jun 21, 2026

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

Scapular kinematics in constrained and functional upper extremity movements.

Tal Amasay1, Andrew R Karduna

  • 1Department of Sports and Exercise Sciences, Barry University, Miami Shores, FL, USA.

The Journal of Orthopaedic and Sports Physical Therapy
|August 4, 2009
PubMed
Summary

Scapular kinematics differ significantly between constrained and functional arm movements. This highlights the need for caution when applying data from controlled tests to real-world activities, impacting shoulder research and clinical practice.

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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

Related Experiment Videos

Last Updated: Jun 21, 2026

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

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

Area of Science:

  • Biomechanics
  • Orthopedics
  • Human Movement Science

Background:

  • Abnormal scapulothoracic joint motion is linked to shoulder impingement and other pathologies.
  • Constrained protocols are standard for measuring shoulder kinematics, but functional task data is limited.

Purpose of the Study:

  • To investigate differences in scapular kinematics between constrained and functional shoulder movements.
  • To compare the variability of scapular rotations during various arm elevations.

Main Methods:

  • A controlled laboratory study with 25 healthy subjects using a 3D magnetic tracking system.
  • Collected kinematic data for scapula and humerus during 6 functional tasks and over 42 constrained arm elevations.
  • Analyzed differences in scapular rotations and variability using repeated measures ANOVA and coefficient of multiple correlations.

Main Results:

  • Significant differences in all measured scapular rotations were observed between constrained and functional movements.
  • Scapular rotation variability showed a similar pattern between functional overhead tasks and constrained arm elevation in the scapular plane.

Conclusions:

  • Scapular kinematic data from constrained movements should be interpreted cautiously when applied to functional movements.
  • Generalizing findings from constrained shoulder protocols to functional activities may not be appropriate due to observed kinematic differences.