Shoulder Joint Lecture #1

What range of the glenohumeral joint is considered adduction in the frontal plane?

0 degrees (frontal plane)

How much movement is expected in glenohumeral adduction in a transverse plane?

135 degrees Also known as flexion

What range of the glenohumeral joint is considered extension? (sagittal plane)

40-60 degrees posteriorly

How much movement is expected in glenohumeral abduction in a transverse plane?

45 degrees (movement backwards of the arm, like when stretching the chest muscles) Also known as extension

How much movement is expected in glenohumeral internal and external rotation?

70-90 degrees

What range of the glenohumeral joint is considered flexion? (sagittal plane)

90 to 100 degrees anteriorly

What range of the glenohumeral joint is considered abduction in the frontal plane?

90-95 degrees (lateral, frontal plane)

What is more common, anterior/anteroinferior glenohumeral dislocations or posterior glenohumeral dislocations?

Anterior or anteroinferior glenohumeral subluxations and dislocations are common Posterior dislocations are rare.

Why is the glenohumeral joint frequently injured?

Antomical design- shallowness of the glenoid fossa, laxity of ligamentous structure, lack of strength and endurance muscles.

Don't forget to Study key bony landmarks of scapula, humerus.

Don't forget to Study key bony landmarks of scapula, humerus.

Pair the following movements together based on if they occur at the same time- flexion abduction adduction extension

Flexion occurs with adduction Extension occurs with abduction

What is the anatomic name for the shoulder joint? (HH)

Glenohumeral joint

What is the landmark for motion in the shoulder joint?

Humerus

Which rotator cuff muscle is the strongest? Which is the weakest?

Strongest- Subscapularis Weakest- infraspinatus

Which rotator cuff muscle doesn't rotate? (HH)

Supraspinatus

What is the 2nd line of defense in the Glenohumeral joint?

The Glenoid labrum

What is glenohumeral internal rotation deficit?

The difference in internal rotation range of motion between individual's throwing and nonthrowing shoulders (This was the exercise where Gary had the guys lay on the table on their side, touch there chin to their shoulder, then try to push their arm all the way down to see how far it would go)

The _____, _____ and ______ serve as attachments for shoulder joint muscles

The scapula, clavicle, and humerus

T/F Scapula movement usually occurs with movement of the humerus

True

The shoulder joint is attached to the axial skeletion via the _______ at the _________

clavicle at the SC joint

What is GIRD?

glenohumeral internal rotation deficit

What kind of joint is the Glenohumeral joint?

multi-axial ball and socket joint (enarthrodial)

What are the 4 rotator cuff muscles? (SITS)

supraspinatus, infraspinatus, teres minor, subscapularis