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The shoulder girdle is comprised of which four joints? - Answer✅✅ Sternoclavicular
(S/C)
Acromioclavicular (A/C)
Glenohumeral (G/H)
Scapulothoracic Articulation (S/T)
Sternoclavicular joint is what kind of joint - Answer✅✅ Complex saddle joint
Increases the congruity of the highly irregular joint surfaces - Answer✅✅
Sternoclavicular joint articular disc
Ligaments of the sternoclavicular joint - Answer✅✅ SC ligament, interclavicular,
Costoclavicular
Achieved by placing the arm down at the side of the body - Answer✅✅ Loose
packed position of the SC joint
Achieved through maximum shoulder elevation, when the GH joint exceeds greater
than 110° of flexion or abduction. The clavicle must upwardly rotate to achieve this. -
Answer✅✅ Closed packed position of the SC joint
, Conditions of the SC joint - Answer✅✅ Osteoarthritis, sprain, dislocation, all are
not that common, clavicular fracture is most likely
With ankylosis of a SC joint shoulder elevation is severely limited to approximately
19° - Answer✅✅ Osteoarthritis
Can be very serious injury may require open reduction surgery - Answer✅✅
Posterior dislocation of SC joint
Most common dislocation, usually occurs due to direct trauma to the side of the
shoulder, such as an impact or a fall, typically benign - Answer✅✅ Anterior
dislocation with superior medial displacement of SC joint
Acromioclavicular joint is what kind of joint? - Answer✅✅ Planer joint with
incongruent surfaces
High degree of variability between individuals and within individuals - Answer✅✅
Articular disc of the AC joint
Ligaments of the AC joint - Answer✅✅ Coracoclavicular ligament comprised of
coronoid and trapezoid ligaments, and AC ligament
Achieved by bringing the GH joint into 90° of abduction - Answer✅✅ AC joint
closed packed position
This position is debatable - Answer✅✅ Loose packed position of the AC joint
Conditions of the AC joint - Answer✅✅ Osteoarthritis, osteolysis, AC joint
dislocation or shoulder separation
Resorption of the subchondral bone of the distal clavicle, can be due to trauma or
repetitive stress - Answer✅✅ Osteolysis
Common mechanism of injury is direct impact to the lateral aspect of shoulder or a
fall on outstretched hand, graded on damage to ligaments and displacement of
clavicle, six types of grades of separation, grades 4 to 6 are variations of grade 3 -
Answer✅✅ AC joint dislocation or shoulder separation
One of the most mobile joints - Answer✅✅ Glenohumeral
The glenohumeral joint is what type of joint - Answer✅✅ Ball and socket joint
The head of the humerus articulates with what. To form the GH joint - Answer✅✅
Glenoid fossa
The GH joint at the glenoid fossa is supported by what - Answer✅✅ Glenoid labum,
ligaments, joint capsule, rotator cuff