Exam 2- shoulder Flashcards
what are the 4 articulation of the shoulder
- Glenohumeral joint
- Acromioclavicular joint
- Sternoclavicular joint
- Scapulothoracic joint
what bones make up the schoulder
- sterum
- clavicial
- scap
- humerous
what are some bony structures of the sterum
- manubrium
- clavicular facest
- body
- costal faceets
- xiphoid provess
what are some feature of the clavicle shaft
- it has a curved shaft
- Medially - convex
- laterally- concave
what is the orientation of the clavicle
- slightly above horizontal
- ~20 degrees posteriro to the frontal plane
what are the important structure of the scapula
- 3 angles
- 3 borders
- anterior surface
- posterior surface
what are the 3 angles of the scapula
- inferior
- superiro
- lateral
what are the 3 borders of the scapula
- medial
- axillary
- subscapular
what is in the anterior of the scap
subscapular fossa
what is in the posterior of the scap
- supraspinatus fossa
- infraspinatus fossa
- spine
what does the scap articulat with
humerus at the glenoid fossa and the posterolateral thorax
what are the motions of the glenoid fossa
4 degrees upward
35 degrees anteriorly
so what does the scapula lay on
the scapular plane
what are some bony process of the scapula
- supra/ infra glenoid trubercles
- corocoid process
- acromion
what shape is the head of the humerous
convex head
what is the angle of inclination of the humerous
135 degrees
what is the retroversion of the humerous
30 degrees
what are some bony spot on the top half of the humerous
anatomic neck crests deltoid tuberosity lesser tub greater tub radial groove
what are the joints that need to be considered with shoulder movement
SC, AC, ST, GH
- fx as a series of kinematic links
- ALL must work together
what is the scapulohumeral rhytm of shoulder abduction
2: 1 for every 3 degrees
- -180 degrees = GH( 120 degrees) + St (60 degrees)
what degree is the scapular path in shoulder abduction
60 degrees
what makes up the 60 degrees of the scapular path in shoulder abduction
AC x SC = 60 degrees
how much does the clavicle retract in shoulder abduction
15 degrees
How does the shoulder tilt and rotate when in abduction
There will be posterior tilt and external rotation and this will be determined by AC x SC
How will the clavicle rotate when the shoulder is abducted
20 – 35 degrees in rotating at the Ac joint
How will the humerus rotate when the shoulder is abducted
It will externally rotate at about 45 degrees
-Greater tubercle vs acromion
What way would abduction arthrokinematics roll and slide with convex on concave rule
Superior roll
Inferior slide
What makes up the sternoclavicular joint
- Medial end of clavicle e
- Sternal clavicular facet
- Superior border of the first rib
What is the fx of the ( basilar joint) sternoclavicular
Links the appendicular skeleton with the axial skeleton
What type of joint is the sternoclavicular joint
Saddle joint
What makes up the joint capsule of the SC
Anterior SC ligament
Posterior SC ligament
What are some other connective tissue of the SC joint
- Interclavicular lig
- Costoclavicular lig
- Articular disc