12 elbow joint

7/26/2019 12 Elbow Joint

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You may call me

Dr. Vohra


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Elbow Radioulnar & Wrist Joints


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Bones involved are


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Elbow Joint

TypeHinge type of synovial oint!rticulationB"# the trochlea $ capitulum of humerus

$ trochlear notch of ulna $ head of the radius


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%ibrous &apsuleThe fibrous capsule completely encloses the oint. 'ts anterior and posterior

parts are thin and wea() but collateral ligaments strengthen its sides.

The fibrous capsule is attached to the pro*imal margins of the coronoid

and radial fossae anteriorly) but not +uite to the superior limit of the

olecranon fossa posteriorly.

Distally the fibrous capsule is attached to the margins of the trochlear

notch) the anterior border of the coronoid process) and the annular

ligament.

,ynovial membrane-ines the internal surface of the fibrous capsule

-igaments-ateral ligamentedial ligament


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-ateral ligament /radial collateral0's triangular ligament) its ape* is attached pro*imally to the lateralepicondyle of the humerus and its base blends with the annular ligament of

the radius


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edial ligament /ulnar collateral0't is composed of anterior and posterior bands /parts0) which are connected

by a thinner) relatively wea( obli+ue band.

'ts ape* is attached to the medial epicondyle of the humerus.

The strong cord1li(e anterior part is attached to the tubercle on the coronoidprocess of the ulna and the wea(er fan1li(e posterior part is attached to the

medial edge of the olecranon.

The ulnar nervepasses posterior to the medial epicondyle and is closely

applied to the ulnar collateral ligament.
http://download.videohelp.com/vitualis/med/uppnn.htmhttp://download.videohelp.com/vitualis/med/uppnn.htm


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ovements $ muscles

of the Elbow oint

This oint can befle*ed or e*tended

%le*ion is produced by the

brachialisand brachioradialis

muscles) but the main fle*or is

the brachialis. #hen the

forearm is supinated) the

biceps brachii muscle also

fle*es this oint2 when it is

pronated) the pronator teresdoes.

The main e*tensor of the elbow

oint is the triceps brachii muscle.

3ravity and the anconeus muscleassist with this movement.
http://download.videohelp.com/vitualis/med/mmarm.htmhttp://download.videohelp.com/vitualis/med/mmarm.htm


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Blood supply of the Elbow oint


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4elations of the elbow ointAnteriorly: Brachialis) tendon of biceps) mediannerve $ brachial artery

Posteriorly: Triceps a small bursa

Medially: 5lnar nerve

Laterally: &ommon e*tensor tendon $ supinator

6erve supply

The oint is supplied by the branches of median)ulnar) musculocutaneous $ radial nerves


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&arrying angle of the Elbow oint


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4adioulnar

JointThe radius and ulnaarticulate with each other

at their pro*imal and

distal ends at synovial

oints) called the pro*imal

and distal radioulnar

oints. These articulations

are the pivot type of

synovial oint that

produces pronation and

supination.


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!rticulation

The radial head articulates with the radial notch of the ulna.The head of the radius is held in position by the strong annular

/annular0 ligament)

%ibrous &apsuleThe fibrous capsule enclosing the oint is continuous with the fibrouscapsule of the elbow oint

,ynovial membraneThe deep surface of the annular ligament is lined with synovial

membrane. &ontinues above with elbow oint

-igamentsThe annular ligament is attached to anterior $ posterior margins of

radial notch. 't is continuous with the capsule of the elbow oint. 't is

not attached to radius

7ro*imal radioulnar oint


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ovementspronation and supination of

the forearm

4elationsAnteriorly: ,upinator $ radial nerve

Posteriorly: ,upinator $ common e*tensor tendon

Medially: 5lnar nerve

Laterally: &ommon e*tensor tendon $ supinator

6erve supplyThe oint is supplied by the branches of median)

ulnar) musculocutaneous $ radial nerves


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Distal radioulnar ointType7ivot type of synovial oint

!rticulationHead of the ulna $ ulnar notch of radius

&apsuleThe capsule encloses the oint but deficient superiorly

-igaments#ea( anterior $ posterior ligaments strengthen the oint!rticular discTriangular fibrocartilaginous) separates the cavity of the distal radioulnaroint from the cavity of the wrist oint. 5nites the radius $ ulna

,ynovial membrane-ines the capsule

6erve supply!nterior interosseous $ deep branch of radial nerves

ovement,upination $ pronation


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Distal radioulnar oint


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Type't is a condyloid type of synovial oint

!rticulationdistal end of the radius and the articular disc above $ scaphoid) lunate $

tri+uetral bones below

&apsuleThe capsule encloses the oint $ is attached above to the distal ends

of radius $ ulna below to the pro*imal row of carpal bones

-igaments

!nterior $ posterior ligaments strengthen the capsule the medial isattached to the styloid process of ulna $ to the tri+uetral bone. The

lateral ligament is attached to the styloid process of radius $ to the

scaphoid bone

#rist oint /radiocarpal0


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,ynovial membrane-ines the capsule $ attached to the margins of the articular

surfaces. The oint cavity does not communicate with that of distal

radioulnar oint or with the oint cavities of intercarpal oints

6erve supply!nterior interosseous $ deep branch of radial nervesovementThe movements of adduction) abduction) fle*ion) e*tension and

circumduction are possible.

4otation of the wrist oint is impossible because the articular surfaces are

ellipsoid in shape2 however) pronation and supination of the hand

compensate for the absence of this movement

&ont.#rist oint /radiocarpal0


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Fractures of the wrist (e.g., Colles' fracture)

involving the distal end of the radius are the

most common type of fracture in personsover 50 years of age


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12 elbow joint

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