Pectoral Girdle Fractures

Published on 16/04/2015 by admin

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Last modified 16/04/2015

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20 Pectoral Girdle Fractures

Anatomy of the Pectoral Girdle

image

Shoulder Bones and Ligaments

image

Clavicle

Clavicle

• Parts and landmarks: sternal end/facet, impression for costoclavicular ligament, shaft (body), conoid tubercle, trapezoid line, subclavian groove, acromial end/facet

Scapula

• Parts: glenoid fossa (cavity) supraglenoid tubercle, infraglenoid tubercle, neck, coracoid process, suprascapular notch, superior border, superior angle, medial border, inferior angle, lateral border, subscapular fossa, spine, acromion, supraspinous fossa, infraspinous fossa

Pectoral Girdle and Shoulder Joints

• Sternoclavicular joint

image Synovial, with articular disc (dual axes of movement)
image Extremely strong: only joint attaching upper-limb girdle to the axial skeleton

• Acromioclavicular (AC) joint

image Synovial, gliding/plane
image Supported by acromioclavicular ligament
image Acts as a pivot point to increase range of arm motion (raise arm over head)

• Glenohumeral joint (also covered in Chapter 21, Humerus Fractures)

image Synovial, ball and socket with labrum
image Basis for upper limb positioning and transmission of forces to pectoral girdle
image Involved in glenoid fractures (intraarticular)
image Biceps (long) tendon inserts on supraglenoid tubercle
image Triceps (long) tendon inserts on infraglenoid tubercle

Ligaments

• Coracoclavicular ligament

image Very strong, two-part
image Shares forces between clavicle and scapula
image Trapezoid: nearly horizontal, attaches to conoid tubercle and superior surface of coracoid
image Conoid: nearly vertical inverted triangle, attaches to coracoid root
image Parts may be separated by bursa.
image Base for supporting scapula and upper limb on the clavicular “strut”

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