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Related Concept Videos

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.
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Muscle Coordination and Action01:24

Muscle Coordination and Action

Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...
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...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Kinetic chain abnormalities in the athletic shoulder.

Aaron Sciascia1, Charles Thigpen, Surena Namdari

  • 1Shoulder Center of Kentucky, Lexington, KY 40504, USA. ascia@lexclin.com

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Summary

Repetitive overhead activities can cause shoulder injuries. Understanding the body's kinetic chain biomechanics helps prevent these overuse injuries by optimizing muscle activation and energy transfer.

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Human Movement Science

Background:

  • Overhead activities place repetitive loads on the shoulder.
  • The kinetic chain, involving segmental activation of body links, enables effective force transfer for overhead tasks.
  • Proper muscle activation originates from the core and transfers energy to the extremities, including the shoulder.

Purpose of the Study:

  • To explain the role of the kinetic chain in overhead activities.
  • To identify factors contributing to overuse shoulder injuries.
  • To highlight the importance of biomechanical understanding for injury prevention.

Main Methods:

  • Review of kinetic chain principles in relation to overhead movements.
  • Analysis of anatomical and muscular factors influencing shoulder function.
  • Discussion of biomechanical concepts for detecting maladaptations.

Main Results:

  • The kinetic chain is characterized by optimized anatomy, efficient motor patterns, and sequential force generation.
  • Anatomical deficits (weakness/tightness) in the leg, pelvic core, or scapular muscles can lead to overuse shoulder injuries.
  • Understanding kinetic chain biomechanics is crucial for preventing and detecting shoulder injuries.

Conclusions:

  • The kinetic chain is essential for effective overhead activity performance.
  • Identifying and addressing deficits in the kinetic chain can prevent overuse shoulder injuries.
  • A thorough understanding of biomechanics is key to managing shoulder health during repetitive overhead tasks.