Sternoclavicular Joint

Question 1

SC joint

Answer 1

only direct attachment of the upper limb to the axial skeleton

Question 2

the joint is:

Answer 2

saddle-shaped synovial joint between the proximal clavicle and the clavicular notch of the manubrium of the sternum and 1st costal cartilage
with a fibrous articular disc is interposed between the joint surface

Question 3

degrees of freedom?

Answer 3

3 degrees of freedom

Question 4

physiologic motions

Answer 4

elevation/depression
protraction/retraction
axial rotation

Question 5

elevation

Answer 5

distal clavicle elevates (proximal clavicle depresses)

Question 6

depression

Answer 6

distal clavicle depresses (proximal clavicle elevates)

Question 7

protraction

Answer 7

BOTH ENDS move anteriorly

Question 8

retraction

Answer 8

BOTH ENDS move posteriorly

Question 9

axial rotation

Answer 9

clavicle rotates about its long axis

most rotation is posterior

Question 10

sternal articular surface

Answer 10

large and convex in the coronal plane

small and concave in the sagittal plane

Question 11

clavicular notch

Answer 11

shallow and concave in coronal plane

small and convex in the sagittal plane

Question 12

Ligamentous Support of the SC

Answer 12

Sternoclavicular Ligaments
Interclavicular Ligament
Costoclavicular ligament

Question 13

Sternoclavicular Ligaments

Answer 13

attach from the clavicular notch to the medial end of the clavicle

• anterior limits posterior rotation and retraction
• posterior limits anterior rotation and protraction

Question 14

Interclavicular ligament

Answer 14

runs along the jugular notch attaching to the medial ends of both clavicles
-limits clavicular depression
“hold shoulder up”

Question 15

costoclavicular ligament

Answer 15

runs from the medial clavicle to the 1st rib and associated costal cartilage and manubrium of sternum
- limits clavicular elevation

Question 16

the clavicle must:

Answer 16

elevate and rotate for normal upper limb elevation

Question 17

sensory innvervation to the SC joint is by way of:

Answer 17

subclavius and supraclavicular nerves

C3-C4 ventral rami

Question 18

SC arthrokinematcis

Answer 18

clavicular elevation/ depression
clavicular protraction/ retraction
clavicular roation

Question 19

Clavicular elevation

Answer 19

convex clavicular head rolls superiorly and glides inferiorly on disc

Question 20

Clavicular depression

Answer 20

convex head rolls inferiorly and glides superiorly

Question 21

Clavicular retraction

Answer 21

concave articular surface of clavicle rolls and slides POSTERIORLY on the convex surface of the sternum

Question 22

Clavicular protraction

Answer 22

rolls and slides ANTERIORLY on the sternum

Question 23

Clavicular rotation

Answer 23

convex head spins of the concave clavicular notch