The document is a presentation about the sternoclavicular joint and the acromioclavicular joint. It defines the joints, describes their capsule properties and reinforcers like muscles and ligaments. It discusses the movements, physiological importance and common injuries of each joint. The presentation provides details on the anatomy and function of the sternoclavicular and acromioclavicular joints.

1. Welcome
To My
Presentation
Abid Hasan Khan

2. Presented By…
Abid Hasan Khan
Year: 2nd
Session: 2015-16
Department of Physiotherapy
Bangladesh Health Professions Institute
(BHPI),
CRP- Chapain, Savar, Dhaka – 1343.
Abid Hasan Khan

3. Topic
The Sternoclavicular joint &
the Acromioclavicular joint
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4. Contents…
 Definition
 Capsule properties
 Capsule reinforcers-
i)Muscle ii)Ligaments iii)Neurovascular Supply
 Movements of the joint
 Physiological importance
 Injuries of the joint
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5. The Sternoclavicular joint
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6. The Sternoclavicular joint
The Sternoclavicular joint is a saddle
type of synovial joint between the
sternal end of clavicle & the
manubrium of sternum with the
articulation of 1st costal cartilage.
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8. Capsule properties
Strong joint capsule-
Consists of the sternal end of the clavicle, the manubrium
of the sternum & part of the 1st costal cartilage. The
articular surfaces are covered with fibro-cartilage.
The joint is separated into two compartments by a
fibro-cartilaginous articular disc.
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9. Continues….
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10. Capsule reinforcers
Muscle:
 Subclavius muscle :
 Originates at costal cartilage of first rib
 Inserts on inferior aspect of clavicle.
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Ligaments :
There are three major ligaments present in the
Sternoclavicular joint :
 Posterior and anterior sternoclavicular ligament.
 Interclavicular ligament.
 Costoclavicular ligament.
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Neurovascular Supply :
Arterial supply to the sternoclavicular joint is from the
internal thoracic artery and the suprascapular artery.
The veins of the joint follow the major arteries.
The joint is supplied by the medial supraclavicular nerve (C3
and C4) and the nerve to subclavius (C5 and C6).
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13. Continues….
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14. Movements of the joint
The Sternoclavicular joint has a large degree of
mobility. There are several movements that require this
joint involvement :
 Elevation
 Depression
 Retraction
 Protraction
 Rotation
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Movements Muscles
Elevation Upper Trapezius, Levator Scapulae
Depression Lower Trapezius, Pectoralis Minor
Adduction (Retraction) Middle Trapezius, Rhomboids
Abduction (Protraction) Serratus Anterior
Upward Rotation Upper & Lower
Trapezius, Serratus Anterior
Downward Rotation Rhomboids, Pectoralis Minor,
Levator Scapulae
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17. Physiological importance
The Sternoclavicular (SC) joint is
important because it helps to support
the shoulder. The SC joint links the
bones of the arms and shoulder to the
vertical skeleton.
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18. Injuries of the joint
 Dislocation of the clavicle
 Sprains
 Fractures
 Degenarative arthritis
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19. The Acromioclavicular joint
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20. The Acromioclavicular joint
The Acromioclavicular (AC) joint is a
plane type of synovial joint which is a top
joint at the shoulder. It is the junction
between the acromion of scapula and the
clavicle.
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22. Capsule properties
The joint capsule consists of a loose
fibrous layer which encloses the two
articulation surfaces. It also give rise
to the articular disk.
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The joint mainly consists of an
articulation between the acromion of
scapula and the lateral end of
clavicle.
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It has two atypical features :
 The articular surfaces of the joint are lined with
fibrocartilage (as opposed to hyaline cartilage).
 The joint cavity is partially divided by an
articular disc.
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26. Capsule reinforcers
Muscle :
There’s no muscle connects the bones to move the joint.
The Clavicle serves as an attachment for many of the
muscles that act on the joint’s movements. These
include:
 Pectoralis Major (Clavicular head)
 Sternocleidomastoid
 Deltoid
 Trapezius
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Ligaments :
There are three major ligaments present in
the acromioclavicular joint:
 Acromioclavicular ligament
 Conoid ligament
 Trapezoid ligament
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Neurovascular Supply –
Vessels :
The arterial supply to the joint is via two
vessels:
 Suprascapular artery
 Thoraco-acromial artery
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Nerves :
The acromioclavicular joint is innervated by
articular branches of the suprascapular and
lateral pectoral nerves. They both arise
directly from the brachial plexus.
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31. Movements of the joint
The AC joint allows a degree of axial
rotation and anteroposterior movement.
As no muscles act directly on the joint, all
movement is passive, and is initiated by
movement at other joints (such as the
sternoclavicular joint).
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Muscles which move the scapula cause it
to move on the clavicle. Scapular
movements on the chest wall fall into
three groups:
 Protraction and retraction around the
chest wall
 Rotation
 Elevation or depression.
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33. Physiological importance
The AC joint provides the ability to raise
the arm above the head. This joint
functions as a pivot point acting like a
strut to help with movement of the
scapula resulting in a greater degree of
arm rotation.
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34. Injuries of the joint
 Dislocation of the clavicle
 Sprains
 Fractures
 Degenarative arthritis
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35. Abid Hasan Khan

36. Abid Hasan Khan