What type of joint is the sternoclavicular joint?

It is a saddle-type synovial joint. It is formed between the medial end of the clavicle, the superolateral angle of the manubrium sterni, and the adjacent part of the first costal cartilage.

What ligaments stabilize the sternoclavicular joint?

The joint is stabilized by several ligaments: anterior and posterior sternoclavicular ligaments (anterior is stronger), interclavicular ligament (T-shaped, spans both clavicles), and costoclavicular ligament (anchors clavicle to first rib, a key stabilizer).

What movements does the sternoclavicular joint allow?

It permits movement of the pectoral girdle, including elevation, depression, protraction, retraction, and limited rotation of the clavicle. These are essential for shoulder girdle mobility.

How is the sternoclavicular joint protected from dislocation?

Dislocation is rare due to its strong ligaments and an incomplete articular disc that prevents displacement. The costoclavicular ligament also helps prevent backward displacement.

What is the role of the costoclavicular ligament?

It anchors the inferior clavicle to the first rib and costal cartilage. It acts as a strong stabilizer and transmitter of weight from the upper limb.

Why are clavicle fractures more common than sternoclavicular joint dislocations?

Falls on outstretched hands often transmit force along the clavicle, causing fractures near its middle and lateral third junction. The SC joint's strong ligaments and disc make dislocation less likely.

How is weight transmitted through the sternoclavicular joint?

Weight from the upper limb travels from the scapula to the clavicle, then to the sternum via the SC joint. Some force is diverted to the first rib through the costoclavicular ligament.

Sternoclavicular Joint Anatomy – Ligaments & Dislocation

❓ Frequently Asked Questions