acromioclavicular joint

Question 1

joint classification

Answer 1

synovial plane joint

Question 2

axes of movement

Answer 2

3

Question 3

articular surfaces

Answer 3

lateral end of clavicle
anteromedial lip of acromion process of scapula

Question 4

features of articular surfaces

Answer 4

clavicle convex
acromion concave
surfaces covered in fibrocartilage
wedge shaped intra articular disc

Question 5

feature of joint capsule

Answer 5

loose, fibrous capsule attaching to joint margins

Question 6

ligaments

Answer 6

superior AC
inferior AC
coracoclavicular (conoid, trapezoid)

Question 7

function of superior AC ligament

Answer 7

thickening of joint capsule

Question 8

function of inferior AC ligament

Answer 8

thickening of joint capsule

Question 9

feature, origin, insertion, function of conoid part of coracoclavicular

Answer 9

fan shaped
coracoid process -> conoid tubercle on inferior clavicle
restricts forwards movement of scapula

Question 10

feature, origin, insertion, function of trapezoid part of coracoclavicular

Answer 10

flat, quadrilateral band
stronger than conoid
superior surface coracoid process -> trapezoid line on inferior clavicle
restricts backwards movement of clavicle

Question 11

elevation at SC and AC joint

Answer 11

SC 60
AC 15

Question 12

depression at SC and AC joint

Answer 12

SC 60
AC 15

Question 13

protraction and SC and AC joint

Answer 13

SC 35
AC minimal

Question 14

retraction at SC and AC joint

Answer 14

SC 35
AC minimal

Question 15

lateral rotation at SC and AC joint

Answer 15

SC 60
AC 30

Question 16

medial rotation at SC and AC joint

Answer 16

SC 60
AC 30