Humerus articular surface is covered by what kind of cartilage?
Hyaline
Humerus head is retroverted how many degrees?
20-30
Longitudinal axis of head of humerus is how many degrees from axis of neck?
135
Orientation of glenoid fossa places true abduction at how many degrees anterior to frontal plane?
30
Sternoclavicular joint is convex when? and concave when?
Convex: superior/inferior
Concave: anterior/posterior
Sternoclavicular joint articulations are covered with what type of cartilage?
Fibocartilage
Acriomoclvacilar is what kind of joint?
Plane joint
GH Capsule attaches medially where? Laterally where?
Medially: glenoid margin, glenoid labrum, coracoid process
Laterally: humeral anatomical neck and 1 cm on shaft
Attachments of coracohumeral ligaments
Base of coracoid process to greater and lesser tubercle of humerus
Primary function of coracohumera liament?
- Reinforce biceps tendon
2. Reinforce superior capsule to prevent caudal disolocation
What is the coracohumeral ligament taut?
ER
Why is coracoacormial ligament not a true ligament?
Connects two points of same bone?
Glenohumeral ligaments - what are they? (3)
Superior middle and inferior
Where are the 3 glenohumeral ligaments
Anterior glenohumeral joint
What is the function of the glenohumeral ligament?
Reinforce anterior glenohumeral capsule
Where is the transverse humeral ligament?
Over the top of the bicepital groove
Function of transvere humeral ligament
Retinaculum for long biceps tendon
What kind of cartilige is the glenoid labrum?
Fibrocarilaginous
Where does the labrum attach?
Superioraly, inferiorly and long head of biceps tendon superiorly
Primary shoulder burs a is what? Where is it?
Subacromial - btwen deltoid and capsule. Under acromion and coracoacromial ligament and between supraspinatis tendon.
At what degree of shoulder elevation does ER occur? Why?
75 degrees, prevents compression of greater tubercle against acromion
Scapulohumeral rhythm: 1st 30-60 degrees elevation occurs where?
GH join
What percent of total movement is GH and what is ST?
120 glenohumeral, 60 ST
