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proximal & distal RU joints - Coggle Diagram
proximal & distal RU joints
structure
proximal RU joint
articulating surfaces include:
ulnar radial notch
annular lig
head of radius
humeral capitulum
ulna radial notch
is located on lateral aspect of proximal ulna below the trochlea notch
annular lig
is att to ant & post part of notch & encircles head of radius
distal RU joint
articulating surfaces include:
ulna notch of radius
articuar disc
head of ulna
ulna notch
is located at distal end of radius
articuar disc
is att to ulna styloid process & ulna head
ulna head
is convex & covered with articular cartilage
the proximal & distal radioulnar joints are mechanically linked, therefore, motion at one joint is always accompanied by motion at the other joint
ligaments
proximal RU joint
is reinforced by:
interosseous membrane
annular ligament
quadrate ligament
oblique cord
distal radioulnar joint
is reinforced by:
interosseous membrane
dorsal radioulnar ligament
palmar radioulnar ligament
muscles
pronator teres
pronator quadretes
supinator
biceps brachii
functions
supination
pronation
plane
transverse plane
axis
longitudinal axis/Y
supination
supinator
O- lateral epicondyle of humerus, n lat aspect of ulna
I- radius *
biceps brachii
0-80 or 0-90 degrees
pronation
pronator teres
O- humeral head-medial epicondyle of humerus
O-ulna head- coronoid process of ulna
I-by common tendon to lat side of radius
pronator quadratus
O-distal portion of ulna
I- distal portion of radius
0-80 or 0-90 degrees
functioal activities of EJ
joints & muscles of the elbow are used in:
dressing
eating
carrying
lifting
hammering nails
sports like tennis, golf, basketball n baseball
drinking
injuries
compression injuries
falling on the hand when elbow is in extended position(closed packed position of elbow)
may result in
fracture of radial head, neck, or both
if the weight is transmitted towards the radial side
& sometimes reults in the
fracture of coronoid process,
olecranon process or both
if the weight is transmitted towards the ulna side
tennis elbow
is also known as
lateral
epichondyllitis
is characterised by pain & tenderness on the lateral side of the elbow
usually related inflammation of the common extensor tendons of forearm
l
ateral koh ai gengossa tennis kulheveynee
golfer's elbow
is also known as
medial
epicondylitis
is characterised by pain & acute tenderness on the medial side of the elbow
it effects the common flexor origin
medial aa kaireega ai baindhaigen golf kulheveynee