What Is the Glenohumeral Joint?

The glenohumeral joint is a synovial connection between the humeral head and the scapula, including the hemispheric humeral articular surface and the acetabulum of bone and soft tissue. The surface motion of the joint is mainly rotation.

Glenohumeral joint

The glenohumeral joint is a synovial connection between the humeral head and the scapula, including the hemispheric humeral articular surface and the acetabulum of bone and soft tissue. The surface motion of the joint is mainly rotation.
Chinese name
Glenohumeral joint
Missing point
Unstable
Main sport
Spin
Features
flexible
The glenohumeral joint is a synovial connection between the humeral head and the scapula, including the hemispheric humeral articular surface and the acetabulum of bone and soft tissue. The surface motion of the joint is mainly rotation.
The narrow shoulder joint is the glenohumeral joint. In addition to the glenohumeral joint (narrow shoulder joint) described above, the broad shoulder joint also includes the acromioclavicular joint, sternoclavicular joint, interscapular chest wall connection, subacromial structure (second shoulder Joints) and coracoclavicular connections. The end of the scapula is the glenoid, forming the glenohumeral joint with the humeral head; the scapula extends upwards, forming a top structure on the shoulder joint called the acromion; the scapula forms a coracoid process on the anterior and medial side of the shoulder joint.
The glenohumeral joint is the largest and most flexible joint in the human body. It can perform forward flexion, extension, adduction, abduction, internal rotation, external rotation, and circular movements. Although its structural characteristics ensure its Flexibility, but its solid stability is worse than other joints, it is the most unstable joint in the body's large joints. The most common is anterior-inferior dislocation of the shoulder joint, because the acromion, coracoid process and coracoid ligament connected to it above the shoulder joint can prevent the dislocation of the humeral head. The muscles, tendons and joint capsule fibrous layers are healed at the front, back, and upper part of the shoulder joint, increasing its firmness. Only the lower part of the anterior capsule has no muscle and tendon enhancement, which is a weak area of the shoulder joint. Therefore, when the upper limb is abducted, under external force or falling, if the upper limb is abducted and extended to the ground, the humeral head can break through the weak area before and below the joint capsule and move out to the front of the scapula, causing anterior dislocation of the shoulder joint. At this time, the affected shoulder collapsed and lost its rounded bulge, forming a so-called "square shoulder". The range of motion of the shoulder joint under normal conditions is: 180 ° forearm lift, 45 ° adduction, 90 ° abduction, 60 ° external rotation, 90 ° forward flexion, 45 ° extension, 90 ° internal rotation, plus the shoulder joint The activity is based on the sternoclavicular joint as the fulcrum and the clavicle as the lever, so the range of motion of the shoulder joint can be increased by the activity of the "shoulder-thoracic joint".

IN OTHER LANGUAGES

Did this article help you? Thanks for the feedback Thanks for the feedback

How can we help? How can we help?