Articular disc of sternoclavicular joint

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  Articular disc of sternoclavicular joint

Articular disc of sternoclavicular joint

The articular disc of the sternoclavicular joint is a fibrocartilaginous structure that plays a crucial role in the function and stability of the sternoclavicular joint. This joint is the only bony articulation between the upper limb and the axial skeleton, connecting the clavicle to the sternum.

Anatomy

The articular disc is a flat, oval-shaped structure that is interposed between the clavicle and the manubrium of the sternum. It divides the sternoclavicular joint into two separate synovial cavities, each lined with a synovial membrane. The disc is attached superiorly to the superior aspect of the clavicle and inferiorly to the first costal cartilage and the manubrium.

Function

The primary function of the articular disc is to enhance the stability of the sternoclavicular joint. It acts as a shock absorber, distributing forces transmitted through the clavicle during movements of the upper limb. The disc also allows for a greater range of motion by accommodating the incongruent surfaces of the clavicle and the sternum.

Clinical significance

Injuries to the articular disc of the sternoclavicular joint can occur due to trauma or degenerative changes. Such injuries may lead to pain, swelling, and instability of the joint. Dislocation of the sternoclavicular joint, although rare, can involve damage to the articular disc and may require medical intervention.

Related pages

• Sternoclavicular joint
• Clavicle
• Manubrium
• Synovial joint
• Fibrocartilage

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