3b. Shoulder Flashcards
in the lat scap where should the AC joint be
in the entre of the HOH
in the lat scap where should the coronoid point
point superiorly
what are the 5 things that should be checked in a shoulder view such as AP shoulder
lung/pleura ribs clavicle scapula humerus
what does a lipohaemarthrosis in the shoulder look like
fluid level in front of acromion
what are the 3 shoulder dislocations and order them from most to least common
anterior - most
posterior
inferior - least
where is the humeral head displaced in an anterior shoulder dislocation
HOH displaced anteriorly, inferiorly and medially
below the coracoid
what does it mean when the HOH is locked in an ant dislocation
HOH impaled on glenoid rim
what are 2 injuries that accompany ant shoulder dislocations
bankarts and hill sachs
what does the HOH look like in a posterior dislocation of the shoulder
loss of articulation with the glenoid fossa
what is the inferior dislocation for the shoulder and what does it look like
form of anterior dislocation with hyper abduction of the arm
HOH inf to glenoid
what is a hill sach lesion and what does it look like
compression fracture of the posterolateral articular surface of the HOH
what causes the hill sach lesion
ant dislocation of gleno humeral joint when HOH passes over the edge of the ant glenoid fossa
what is the bankarts lesion
avulsion of the anteroinferior glenoid labrum which occurs with ant dislocation
what is the greater tuberosity fracture
avulsion of the greater tuberoscity
what is the AC joint separation judged by in terms of lines
should be horizontal line under distal end of clavicle in the plane with the AC joint
what are the normal AC joint distance
0.3-0.8cm
what is the normal distance for the coracoclavicular ligament
1-1.3cm
what are the 3 grades for AC joint inuries
1, 2 and 3 with 3 being most severe
what is seen in the rotator cuff tear (old injury) and what does the HOH look like
HOH migrates superiorly and lightbulb sign
flattening of the undersurface of the acromion
why is the HOH in a lightbulb sign for the rotator cuff tear old injury
Greater tuberosity has prominence but when there is lack of tension where supraspinatus attaches, lose prominence of greater tuberosity so get lightbulb instead while in AP view
where is the typical calcification of supraspinatus seen
just superiorly to the greater tuberosity of humerus where tendon inserts
what are the 2 soft tissue structures that can be calcified in the shoulder
supraspinatus tendon and subscapularis
what displacement does the middle 1/3 clavicle # have and why
upwards displacement of medial fragment due to sternocleidomastoid muscle pulling it superiorly and lateral fragment is pulled downward by weight of the limb
what are 2 characteristics of scapular neck and glenoid fractures
extra-articular and impacted often
