Upper limb

Acromioclavicular capsule & articular disc

Capsula articularis et discus acromioclavicularis

Origin

Lateral clavicle rim

Insertion

Medial acromial margin; contains an incomplete wedge-shaped fibrocartilaginous disc

Function

Encloses the AC joint plane and provides intra-articular shock absorption and congruence

Innervation

Suprascapular and axillary nerves

Movement & chain

Multi-axial gliding and micro-rotation during shoulder girdle kinematics

Palpation

Palpable directly over the superior shoulder joint line

Clinical

AC joint osteoarthritis with subacromial spurring; post-traumatic disc degeneration.

Segmental innervation

C5–C6

In clinical practice

Ultrasound-guided AC joint injection and manual mobilization

Region in the model

Upper limb