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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.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
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...
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...
Flail Chest-I01:24

Flail Chest-I

Overview of Flail Chest
Flail chest is a severe and potentially life-threatening condition characterized by the fracture of three or more adjacent ribs in multiple places. It is most commonly caused by direct impacts and trauma, such as motor vehicle accidents or injuries from a steering wheel impact. It can also occur due to falls in elderly individuals with osteoporosis, or assaults involving sharp objects.
Pathophysiology
The pathophysiology of flail chest is complex, involving fractures of...

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Related Experiment Video

Updated: Jun 16, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Bilateral anterior shoulder dislocation in a weight lifter.

I Esenkaya1, H Tuygun, I M Türkmen

  • 1Department of Orthopaedics and Traumatology, University of Inönü Turgut Medical Center, Malatya, 44100, TR.

The Physician and Sportsmedicine
|January 21, 2010
PubMed
Summary

Improperly performed behind-the-neck presses can lead to shoulder dislocation. Safer frontal presses are recommended for weightlifters, especially those with shoulder instability, to prevent injury.

Related Experiment Videos

Last Updated: Jun 16, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Area of Science:

  • Sports Medicine
  • Orthopedics
  • Biomechanics

Background:

  • Weightlifting exercises, such as military presses, carry inherent risks.
  • Improper exercise form can overwhelm shoulder muscles, leading to acute injuries.
  • Behind-the-neck variations pose a particular risk for shoulder joint instability.

Purpose of the Study:

  • To highlight a case of bilateral anterior shoulder dislocation during seated behind-the-neck military presses.
  • To analyze the biomechanical factors contributing to shoulder injury in this exercise.
  • To recommend safer exercise alternatives for weightlifters.

Main Methods:

  • Case report of a young male weightlifter.
  • Analysis of the exercise mechanics of seated behind-the-neck military presses.
  • Review of literature on shoulder injuries in weightlifting.

Main Results:

  • The patient sustained bilateral anterior shoulder dislocation during the exercise.
  • The behind-the-neck movement increases the risk of shoulder instability and dislocation.
  • Shoulder muscles may be unable to stabilize the joint under load in this position.

Conclusions:

  • Seated behind-the-neck military presses can cause serious shoulder injuries like dislocation.
  • Weightlifters, particularly beginners or those with pre-existing shoulder instability, should avoid this exercise.
  • Frontal military presses are a safer alternative, minimizing the risk of posterior shoulder movement and injury.