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CLAVICLE DUHS

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					                               CLAVICLE

LEARNING OBJECTIVES
At the end of lecture the student should be able to :

   • Understand the general and special features of clavicle

   • Know the important attachments on it

   • Appreciate the importance of clavicle in body

   • Understand the causes of clavicle fractures and its importance


INTRODUCTION
   • The clavicle or collar bone receives its name from the Latin clavicula
     ("little key") because the bone rotates along its axis like a key when the
     shoulder is abducted.

   • Long bone.

   • Makes up part of the shoulder girdle.

   • “S” shaped

   • BEAUTY BONE IN FEMALES


THE CLAVICLE
THE CLAVICLE
 • Convex in shape anteriorly near the
   sternal junction.

 • Concave anteriorly on its lateral edge
   near the acromion.




THE CLAVICLE
 • Connects the arm to the body.

 • Located directly above the first rib.

 • Has a rounded medial end and a flattened lateral end.

 • Acts as a strut.

 • Medially, it articulates with the manubrium at the sternoclavicular joint.

 • At its lateral end it articulates with the acromion of the scapula at the
   acromioclavicular joint.


SIDE DETERMINATION
 • The medial 2/3rd is rounded

 • The lateral 1/3rd is flat

 • The undersurface bears a subclavian groove which extends as far as Conoid
   tubercle
DEVELOPMENT
 • First bone to begin the process of ossification during development of the
   embryo (5th - 6th weeks of gestation).

 •   One of the last bones to finish ossification, (21-25 years of age)

 • Intramembranous ossification.



DEVELOPMENT (cont’d)
 • It is ossified from three centers—

 •   Two primary centers, a medial and a lateral, for the body, which appear
     during the fifth or sixth week of fetal life;

 • And a secondary center for the sternal end, which appears about the
   eighteenth or twentieth year, and unites with the rest of the bone about the
   twenty-fifth year.
FUNCTIONS OF CLAVICLE
   • Transmits physical impacts from the upper limb to the axial skeleton

   • Covers the cervicoaxillary canal, through which several important structures
     pass.

   • Serves as a rigid support from which the scapula and free limb are
     suspended.

   • This arrangement keeps the upper limb away from the thorax so that the arm
     has maximum range of movement.



DIFFERENCE ACC. TO GENDER
• In the female,

The clavicle is shorter,thinner, less curved and smoother than in the male.

The acromial end is a little below the level of the sternal end ;

• In the male;

It is on a level with, or slightly higher than, the sternal end.


CLAVICLE-medial and lateral articulations
• Sternoclavicular articulation.




The left shoulder and acromioclavicular joints
ATTACHMENTS




Attachments on clavicle                Muscle/Ligament

Superior surface and anterior border   Deltoid

Superior surface                       Trapezius

Inferior surface                       Subclavius

Inferior surface                       Conoid ligament

Inferior surface                       Trapezoid ligament

Anterior border                        Pectoralis major

Posterior border                       Sternocleidomastoid

Posterior border                       Sternohyoid

Posterior border                       Trapezius




THE CLAVICLE; ATTACHMENTS
THE CLAVICLE; ATTACHMENTS




THE CLAVICLE; ATTACHMENTS


1. Pectoralis major

2. Deltoid

3. Trapezius

4. Sternocleidomastoid

5. Trapezoid Ligament

6. Conoid Ligament

7. Subclavius and clavipectoral fashia

8. Costoclavicular Ligament

9. Sternohyoid

10.Sternal end with articular cartilage

11.Acromial end with articular cartilage
APPLIED ANATOMY,
Common clavicle injuries
  • acromioclavicular dislocation
  • sternoclavicular dislocations
  • clavicle fractures
  • osteolysis
  • degeneration of the clavicle


CLAVICLE FRACTURES
  • Clavicle fractures involve approximately 5% of all fractures seen in hospital
    emergency admissions.

  • It is most often fractured in the middle third of its length at the junction of its
    lateral with its intermediate third, that is to say, at the junction of the two
    curves, for this is its weakest part.

  • Children and infants are particularly prone to it.

  • Fall on an outstretched arm.

  • Medial end is lifted upwards by the pull of sternocleidomastoid.

  • Lateral end is pulled downwards by the weight of the arm and effect of
    gravity.
CLAVICLE FRACTURES




CLAVICLE FRACTURES
SYMPTOMS OF FRACTURED CLAVICLE
 • Pain, particularly with upper extremity movement
 • Swelling
 • Referred pain: dull to extreme ache in and around clavicle area,
   including surrounding muscles

				
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posted:8/18/2011
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