Musculoskeletal UE Flashcards
Shoulder complex is comprised of
SC, AC (prevents humerus from upward displacement & holds scapula with clavicle), GH (ant, post, joint capsule, labrum & long head of bicep), Scapulothoracic (pseudo joint)
When the GH joint is dislocated (forward), the labrum (anterior/inferior portion) is torn away from the fossa. The pathology is coined what?
Bankart Lesion
Shoulder flexion or abduction comes from what structures (and how much)?
GH joint (120deg) & scapulothoracic (60deg)
Name structures that help facilitate upward rotation of scapula during arm elevation
Traps, serratus anterior
Name structures that help facilitate downward rotation of scapula during arm extension
Rhomboids, levator, pec minor
Name structures that help facilitate scapula protraction
serratus ant & pec minor
Name structures that help facilitate scapula retraction
rhomboids, mid & low traps
What are the open & closed pack positions for the shoulder?
Open = full abd w/ ext rot Closed = 45deg abd 30deg horz add in scap plane
What is the GH capsular patterns?
Ext rot > (more restricted) abd > int rot
Ischemia of the deep flexor muscles in the forearm can cause this type of contracture, permanently shortening the involved muscles
Volkmann’s
FOOSH can result in a fracture of the distal radius or commonly referred to as this?
Colles’ fracture
What’s the most active muscle in grasping objects?
ECRB
What is the action, spinal innervation and nerve supply of the infraspinatus?
- horizontal abduction, abduction, ER
- suprascapular nerve
- C5, C6 (brachial plexus trunk)
What is the action, spinal innervation and nerve supply of the subscapularis?
- abduction, adduction (w/arm at side IR)
- subscapular nerve
- C5, C6 (posterior cord)
What is the action, spinal innervation and nerve supply of the supraspinatus?
- abduction
- suprascapular nerve
- C5, C6