Elbow Lecutre Flashcards
What is the humeroulnar articulation comprised of
The medial lip of the trochlea and the trochlear notch of the ulna
What is referenced as teh “true elbow joint”
Humeroluna articulation
What is the humeroulnar articulation of the trochlea
The concave on the medial lateral surface and convex on the AP surface
What is the humeroulnar articulation of the ulnar
Convex on the medial lateral surface and concave on the AP surface
How does the trochlea and ulna move for flexion and extension
Concave ulna(trochlear notch) moving on convex trochlea (humerus) AP
Roll and glide anterior for flexion and posterior for extension
During weight bearing activities how much does the humeroulnar articulation support the weight
40%
How does the trochlea angle in the humerolunar articulation to allow for more flexion and room for the biceps brachii
Angles forwards 45°
What kind of joint is the humeroradial joint
Uniaxial hinge joint
What is the humeroradial comprised of
Head of the radius and the capitellum of the distal humerus
How is the humeroradial articulation on the lateral aspect of the elbow
Concave radial head and the convex capitellum of the humerus
Tubercle/groove on the lateral lip of the trochlea of the humerus capitellum
What happens during flexion and extension at the humeroradial articulation
Flexion: radial head glides anteriorly into the radial fossa (concave on convex)
Extension: glides posteriorly
During weight bearing activities how much does the humeroradial articulation joint support
60%
What does the proximal radioulnar joint consist of
The radial head , AL ring , radial fossa of the ulna
What is supporting the radial head proximally
Annular ligament
Where does the annular ligament attach
Posterior radial notch of the ulna
What is the articulation of the proximal radioulnar articulation
Convex radial head articulates with the concave radial notch of the ulna
What is the movement of the proximal radioulnar joint
Radius moving on the ulna so convex on concave so role and glide in opposite
What is the movement of the proximal radioulnar joint movement during supination
Rolls posterior/laterally
Glides anteriorly
(Thinks where ur thumb is going and that’s the way the bone will roll)
What is the movement of the proximal radioulnar joint movement during pronation
Roll anteriorly/medially
Glides posterior
How does the ulna move with pronation and supination at the proximal radioulnar joint
Pronation: lateral/posterior
Supination: medial/anterior
What is a complex structure consisting of a central band and several additional accessory bands that are inconsistently present across cadaver specimens.
Interrrosseous membrane (aka medial radioulnar joint)
What maintains joint space between he ulnar and radius during rotational movements
IOM
What is the central brand of the IOM essential for
Distribution of loads and communication between the PRUJ to the distal radioulnar joint
When is the PEAK STRAIN to the IOM central band
During neutral forearm rotation
