the shoulder Flashcards
Arthrokinematics of the glenohumeral joint(abduction and medial/ adduction and lateral)
- Roll in the direction of the
movement - Slide in the opposite direction
Arthrokinematics of the glenohumeral joint(pure flexion and extension)
- Spin around the axis
perpendicular to the joint
what is the main role of the rotator cuffs
The rotator cuff’s main role is to
provide the fine tuning of the
GHJ movement to keep the
humeral head centrally located in
the glenoid fossa
elevation and abduction force couple
- Deltoid’s pull is upwards, helping
the roll but superiorly displacing
the humeral head - Supraspinatus’ pull is medial,
helping the roll but without
superior displacement - Subscapularis, infraspinatus and
teres minor’s pulls are
inferomedial, creating the slide to
prevent the superior displacement
what are the functions of the elbow
Orientate hand in space
* Transmit force through upper limb
* Open chain eg; throwing
* Closed chain eg; pushing open a door
movements of the elbow/ forearm
flexion
extension
pronation radius crosses over
supination radius pivots back to being side by side
joints of the elbow and forearm
- Humeroulnar joint
- Humeroradial joint
- Proximal radioulnar joint
- Distal radioulnar joint
Humeroulnar joint
- Between Trochlea of humerus
and Trochlear notch of ulnar - Hinge joint
Humeroradial joint
- Between Capitulum of
humerus and Fovea of radius - Pivot joint – a bit like a mini
ball & socket
Radioulnar joints
Both pivot joints that allow the
radius to rotate around the ulnar for
supination and pronation
Proximal = Radial head and radial
notch of the ulna
Distal = Ulnar head and ulnar notch
of the radius
medial vs lateral rotation during abduction
in medial rotation their is less abduction due too the tuberosity is closer in the joint
in lateral rotation their is more abduction
levers at the elbow
