yogabook / joints / sternoclavicular joint
Contents
Image: Sternoclavicular joint from ventral view(Linkmap)
Sternoclavicular joint
The sternoclavicular jointis the only true joint that connects the upper extremity to the trunk. The joint is a ball-and-socket joint and has an intervertebral disc; the clavicle can move in this joint in the frontal and transverse planes and can rotate. Stabilizing ligaments are the anterior sternoclavicular ligament, posterior sternoclavicular ligament, interclavicular ligament and costoclavicular ligament. The first sternocostal joint lies below this joint. Movements in the sternoclavicular joint are always accompanied by movements in the acromioclavicular and scapulothoracic joints.
Articulating bones
Intervertebral disc (Discus articularis)
The fibrocartilaginous discus articularis sternoclavicularis lies between the articulating bones sternum (here its manubrium) and clavicle, which form a saddle joint due to their shape, but which functionally corresponds more to a ball-and-socket joint due to the discus.
Movements
Due to the discus articularis between the bones, three dimensions of movement of the clavicle in relation to the sternum are possible: in the transverse plane, in the frontal plane and rotation of the clavicle around the longitudinal axis.
Ligaments
Interclavicular ligament
The interclavicular ligament connects both sternal ends of the clavicles. It thus limits the depression of the shoulder blades.
Images:
Linkmap: Sternoclavicular joint
Linkmap: Sternum, ligaments
Anterior sternoclavicular ligament
The anterior sternoclavicular ligaments are broad ligaments that extend on both sides from the anterior parts of the incisura clavicularis at the sternal end of the clavicle diagonally caudal-medial to the sternal manubrium. The ligament is partially covered by the pars sternalis of the sternocleidomastoid. Dorsally, it is connected to both articular surfaces, the articular disc and the capsule. It secures the clavicle against dorsal translation(retraction).
Images:
Linkmap: Sternoclavicular joint
Linkmap: Sternum, ligaments
Posterior sternoclavicular ligament
The posterior sternoclavicular ligaments are ligaments that run from the dorsal parts of the sternal end of the clavicle diagonally caudally-medially to the sternal manubrium. Ventrally, it is connected to the discus articularis and the two articular surfaces. The sternohyoid and sternothyroid lie dorsally. It secures the clavicle against ventral translation(protraction).
Images:
Linkmap: Sternoclavicular joint
Linkmap: Sternum, ligaments
Costoclavicular ligament
The ligament connects the underside of the clavicle and the upper side of the first rib and thus secures the clavicle against cranial translation(elevation).
Images:
Linkmap: Sternoclavicular joint
Linkmap: Sternum, ligaments
Linkmap: Sternum, ligaments
Linkmap: Clavicle
Pathology
Some diseases of the joint: Dislocations are rare, but fractures of the clavicle have an effect on the joint. Arthroses are also rare, causing pain mainly during lateral abduction from approx. 80°. The sternoclavicular joint is less frequently affected by rheumatic diseases.
Tests
Tests of the sternoclavicular joint
Tests of the movement directions
Tests of the spanning muscles
Pictures
Manubrium sterni in section and plan view with joints (image links to linkmap)
