Related Experiment Video
Updated: Aug 14, 2026
10:10
Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
[Spontaneous shoulder dislocation by posterior primary humeral notch: two case reports]
1Service d'Orthopédie-Traumatologie, Hôpital Général, rue du Faubourg-Raines, 21000 Dijon.
Summary
Two cases of spontaneous anterior shoulder dislocation were analyzed. A posterior bone defect was identified as the causal mechanism in both instances, suggesting it
Area of Science:
- Orthopedics
- Traumatology
- Radiology
Background:
- Spontaneous anterior shoulder dislocation is a rare condition.
- Etiology is often multifactorial, involving intrinsic and extrinsic factors.
Observation:
- Two patients presented with spontaneous anterior shoulder dislocation.
- Both cases revealed a posterior bone defect as the primary cause.
Findings:
- Posterior bone defects are a significant, previously underemphasized, factor in anterior shoulder instability.
- This finding challenges traditional understanding, highlighting the role of bone morphology.
Implications:
- Constitutional factors predisposing to shoulder dislocation should encompass posterior bone defects.
- Radiographic evaluation for posterior bone defects is crucial in diagnosing shoulder instability.
- This may lead to revised diagnostic criteria and treatment strategies for shoulder dislocations.
Related Concept Videos
01:23Muscles 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...
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
01:31Muscles 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...
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...