Acromioclavicular joint

Acromioclavicular joint: Anatomy & FunctionAnatomy, functions, innervation and blood supply of the thoracic joints
~ 2-3 min

The scapula is connected to the clavicle by the acromioclavicular joint (articulatio acromioclavicularis).

Acromioclavicular joint (articulatio acromioclavicularis)
Acromioclavicular joint (articulatio acromioclavicularis)

This joint is formed between the acromial facet (facies articularis acromialis) and the acromial end of the clavicle (extremitas acromialis claviculae).

Acromial facet (facies articularis acromialis)
Acromial facet (facies articularis acromialis)
Acromial end of the clavicle (facies articularis clavicularis)
Acromial end of the clavicle (facies articularis clavicularis)

The joint capsule is attached along the edge of the articular surfaces, it is dense and fibrous.

According to the classification, the joint is plane, multiaxial, simple, and combined (with a sternoclavicular joint (articulatio sternoclavicularis)).

The range of motion in the joint is insignificant, it is carried out around three axes. The main motion is the raising of the hand.

Notably, raising to the horizontal line is carried out in the shoulder joint, and above the horizontal line — due to movement around the sagittal axis in the sternoclavicular joint (articulatio sternoclavicularis). The scapula also rotates during this motion.

If the clavicle moves around the anterior-posterior axis, then the shoulder girdle shifts up or down. If the clavicle moves around the vertical axis, the shoulder girdle shifts anteriorly or posteriorly.

The ligamentous apparatus of the joint is composed of several ligaments:

  • The acromioclavicular ligament (ligamentum acromioclaviculare), connecting the acromion and the acromial end of the clavicle.

    Acromioclavicular ligament (lig. acromioclaviculare)
    Acromioclavicular ligament (lig. acromioclaviculare)
    Acromioclavicular ligament (lig. acromioclaviculare)
    Acromioclavicular ligament (lig. acromioclaviculare)
    Acromioclavicular ligament (lig. acromioclaviculare)
    Acromioclavicular ligament (lig. acromioclaviculare)
  • The coracoclavicular ligament (ligamentum coracoclaviculare),

    Coracoclavicular ligament (lig. coracoclaviculare)
    Coracoclavicular ligament (lig. coracoclaviculare)
    Coracoclavicular ligament (lig. coracoclaviculare)
    Coracoclavicular ligament (lig. coracoclaviculare)

    which consists of the trapezoid ligament (ligamentum trapezoideum) and the conoid ligament (ligamentum conoideum).

    Trapezoid ligament (lig. trapezoideum)
    Trapezoid ligament (lig. trapezoideum)
    Trapezoid ligament (lig. trapezoideum)
    Trapezoid ligament (lig. trapezoideum)
    Conoid ligament (lig. conoideum)
    Conoid ligament (lig. conoideum)
    Conoid ligament (lig. conoideum)
    Conoid ligament (lig. conoideum)

    The additional structures of the joint include the articular disc (discus articularis) in 1/3 of the cases.

    The following vessels and nerves take part in the blood supply and innervation of the joint.

  • Arteries: acromial branches of the thoraco-acromial artery (rr. acromiales a. thoracoacromialis), suprascapular artery (a. suprascapularis)

  • Veins: thoraco-acromial vein (v. thoracoacromialis), suprascapular vein (v. suprascapularis)

  • Nerves: supraclavicular nerves (nn. supraclaviculares)

Dictionary

Acromioclavicular joint

Acromioclavicular joint
art. acromioclavicularis
Scapula
scapula
Clavicula
clavicula
Acromial facet
facies articularis acromialis
Acromial end
facies articularis clavicularis
Sternoclavicular joint
art. sternoclavicularis
Acromioclavicular ligament
lig. acromioclaviculare
Coracoclavicular ligament
lig. coracoclaviculare
Trapezoid ligament
lig. trapezoideum
Conoid ligament
lig. conoideum
Articular disc
discus articularis
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