Shoulder Girdle Flashcards
what is the concept of dynamic stability? (mobility and structure)
- greatest mobility of any joint
- not structurally very stable
what is the scapular resting position?
- 30 degree scaption plane
- 20 degree anterior tilt
describe the structure of the humeral head
30 degree retroversion in line with the scaption plane
describe the orientation of the scapula and clavicle
- 30-35 scaption plane
- 20 degree clavicle
what would be the result if our humerus didn’t have a 30 degree retroversion?
our curls would be IR 30 deg
which joint improves available shoulder ROM
STJ
which joint maintains favorable deltoid and RC muscle LT relationships?
STJ
which joint provides stability for overhead work and allows for UE shock absorption?
STJ
which joint permits elevation of the body with UE weight bearing
STJ
how are the scapular motions named?
for the glenoid movement
name and describe the disorder that the kid from stranger things has
Cleidocranial Dysplasia/Dysostosis - partially missing clavicle leads to excellent mobility and severely limited stability
what is the only joint that truly connects the UE with the thorax? describe the joint
SCJ - strong ligamentous structure causes the clavicle to fx before dislocation of the joint
How many degrees of freedom at the SCJ? what are the motions?
3 degrees of freedom
- elevation/depression
- protraction/retraction
- posterior rotation
what is the shape of the SCJ?
saddle
describe the SCJ arthokinematics of elevation/depression
- convex on concave - sup roll/inf glide
- convex on concave - inf roll/sup glide
describe the SCJ arthrokinematics of retraction
concave on convex - post roll/slide
what are the two major functions of the ACJ
- key to the alignment of the glenoid
- contributes to scap elevation and up rotation for overhead acts
how many degrees of freedom at the ACJ and what are the motions?
3 degrees of freedom
- up/down rotation
- IR/ER - horizontal plane
- A/P tilting - sagittal plane
scapular winging is noted in which ACJ movement
IR/ER - horizontal plane movement
scapular tipping is noted in which ACJ movement?
A/P tipping - sagittal plane movment
describe scapular upward rotation at the SCJ and ACJ
SC elevation and AC up rotation
describe scapular elevation at the SCJ and ACJ
SC elevation and AC down rot
describe scapular protraction at the SCJ and ACJ
SC protraction and AC IR
what are the major scapular elevators?
UT, levator, rhomboids
what are the major scapular depressors?
- low traps and lats
- pec minor and subclavius
what movement helps you push up out of a chair?
scapular depressors reverse action concentric
what are the major scapular protractors?
serratus anterior
what are the major scapular retractors?
Mid trap, rhomboids, low trap
what are the four force coupling muscles that provide scapular upward rotationa and GH abduction?
UT, LT, SA, Delt
what are the 5 major force coupling muscles for scapular downward rotation with GH adduction?
rhomboids, lats, teres major, infraspinatus, posterior delt
what are the major muscle groups utilized in a seated push up - up phase? (3)
- everything is concentric reverse action
- scap depressors
- GH flexors
- GH adductors
what are the major muscle groups utilized in a seated push up - down phase? (3)
- everything is eccentric reverse action
- scap depressors
- GH flexors
- GH adductors
what are the major muscle groups utilized in an up-phase pull up? (5)
- everything is concentric reverse action
- scap retractors
- scap down rotators
- scap depressors
- GH extensors
- GH adductors
what are the major muscle groups utilized in a down-phase pull up? (5)
everything is eccentric reverse action
- scap retractors
- scap down rotators
- scap depressors
- GH extensors
- GH adductors
what are the major muscle groups utilized in a down-phase push up? (4)
everything is eccentric reverse action
- scap protractors
- scap up rotators
- GH flexors
- GH horizontal addcutors
what are the major muscle groups involved in an up-phase push up? (4)
everything is concentric reverse action
- scap protractors
- scap up rotators
- GH flexors
- GH horizontal adductors
what are the major muscle groups involved in reaching back for the wheels in a wheel chair? (6)
everything is concentric normal action
- scap retractors
- scap downward rotators
- GH extensors
- GH IRs
- GH horizontal abductors
- GH abductors
what are the major muscle groups involved in pushing wheels in a wheel chair? (6)
everything is concentric normal action
- scap protractors
- scap upward rotators
- GH flexors
- GH ERs
- GH horizontal adductors
- GH adductors
what are the major muscles involved in advancing crutches? (4)
everything is concentric normal action
- scap protractors
- scap upward rotators
- GH flexors
- GH horizontal adductors
what are the major muscles involved in elevating oneself on crutches without advancement? (3)
everything is concentric reverse action
- scap depressors
- GH flexors
- GH adductors
what are the major muscle groups involved in advancement with crutches? (4)
everything is reverse action, but muscle action varies
- scap retractors - concentric
- scap depressors - isometric
- GH extensors - concentric
- GH adductors - isometric
