Shoulder and Upper Arm Pathologies Flashcards
What three other joints augment the motion of the GH joint?
Sternoclavicular joint
acromioclavicular joint
the movement between the scapula and thorax
T/F A change in the mobility or function in the AC, SC, and movement between the scapula and the thorax increases the function at the GH joint.
Fals, It will decrease the function a the GH joint
SC Joint
Sternoclavicular Joint
Where does the proximal portion of the clavicle meet on the sternum?
Meets at the manubrium and a portion of the first costal cartilage
SC Joint is a gliding joint that allows 3 degrees of freedom of motion…which are??
- Elevation and Depression
- Protraction and Retraction
- Internal and External Rotation
Where does the SC joint axis lie?
It lies lateral to the joint itself
What enhances the overall stability of the SC Joint?
The presence of a fibrocartilaginous disk
T/F The SC Joint is one of the most dislocated joints.
False, It has the poorest boney stability of all major joints, but its strong ligamentous structure and protected location makes it one of the least dislocated joints.
T/F The SC Joint is surround by a synovial membrane.
True
What ligaments support the SC Joint?
Anterior and Posterior SC ligaments, The Costoclavicular ligament, and the Interclavicular ligament.
What qualities does the sternoclavicular disk have that are similar to another structure in the body?
The menisci of the knee, functions as a shock absorber.
Where does the upper and lower portions of the disk attach too?
Upper portion - Clavicle
Lower portion - Manubrium and 1st costal cartilage
What is the function of the Sternoclavicular disk?
The disk divides the joint into two articular cavities, one between the disk and clavicle and the other between the disk and manubrium.
The synovial membrane is reinforced by what ligaments?
The Anterior and Posterior SC Ligaments
What are the functions of the Anterior and Posterior Sternoclavicular Ligaments?
Anterior Fibers resist posterior displacement of the clavicle on the manubrium.
Posterior Fibers resist anterior displacement of the clavicle on the manubrium.
What is the function of the Costoclavicular Ligament?
It serves as an axis of clavicular elevation/depresion and protraction/retraction.
What ligament joins the two SC joints together?
Interclavicular ligament
What is the function of the Interclavicular ligament?
- It resists downward movement of the clavicle
2. Assists in dissipating force across the entire upper extremity.
What is another name for the costoclavicular ligament?
Rhomboid ligament
What is the function of the Costoclavicular ligament?
Posterior fibers - limit elevation & medial movement of clavicle.
Anterior fibers - resist clavicular elevation from the superior pull of the sternoclidomastoid and sternohyoid muscles & limits medial translation of clavicle.
The distal end of the clavicle meets the scapula where?
At the Acromion Process forming the Acromioclavicular joint (AC joint)
The AC joint is a synovial joint and allows a gliding articulation between the __________ and ________, capable of 3 degrees of freedom of movement, each around an oblique axis:
Why this articulation?
Acromion process, clavicle
1. Internal and External Rot around a vertical axis
2. Upward and Downward Rot around an axis perpendicular to the plane of the scapula
3. Anterior and Posterior scapular tipping around a horizontal axis.
This articulation allows for the motion necessary to maintain the relationship between the scapula and the clavicle in the early and late stages of the GH joint’s ROM.
The AC joint is surrounded and supported by?
Surrounded by a synovial membrane
supported by the AC ligament and the Coracoclavicular ligament, which suspends the scapula from the clavicular
How many portions of the AC ligament are there?
2
The superior and inferior portions of the AC ligament function to…
maintain continuity between the articulating surfaces of the acromion and clavicle.
