Radio Ulnar Joint-Prasath

7/29/2019 Radio Ulnar Joint-Prasath

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BY Prasath


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They are classified into three types:

1. Superior radioulnar joint

2. Middle radioulnar joint

3. Inferior radioulnar joint


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Type - Pivot type of synovial joint


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Middle Radio Ulnar joint is formedmy the interosseous membrane

which connects the radius and ulna. The fibers run downwards from

radius to ulna

The direction of Oblique cord isopposite to that of interosseousmembrane.


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Functions of interosseous

membrane:

1. It binds the radius ulna to eachother

2. It provides attachments to manymuscles

3. It transmits forces applied to the

radius to the ulna. Radius is theimportant bone in wrist joint andulna is the main bone in elbow joint


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Its a pivot type of synovial joint


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There are two movements they are supinationand pronation


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Its a rotatory movement in the forearm aroundthe vertical axis .

In semi flexed elbow the palm is turned

upwards is called as supination This movement takes place in both inferior and

superior radioulnar joint

The vertical axis moves forwards and mediallyduring supination

As a result of this movement the axis isdisplaced medially


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Supination is more powerful than pronationdue to its antigravity movement

It is responsible for all screwing movment E.g. tightening nuts and bolds

It is brought about by supinator and biceps

brachii.


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Its a rotatory movement in the forearm around thevertical axis

In semi flexed elbow the palm is turneddownwards is called as pronation

The vertical axis moves backwards and laterallyduring pronation

As a result of this movement the axis is displacedlaterally

It is brought about by pronator quadratus andpronator teres


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Tennis elbow:

Abrupt pronation with full extended elbow

and lead to pain and tenderness over the lateralepicondyle

Cause:

1. Sprain of radial collateral ligament2. Tearing of fibers of extensor carpi radialis

brevis


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Students elbow or miners elbow:

It is characterized by effusion into the bursa

into the subcutaneous posterior surface ofolecranon

E.g. students in lecture support their head for

sleeping with their hands with flexed elbows Golfers elbow:

It is micro trauma of medial epicondyle ofhumerus

If the carrying angle is more(normal 13 degree)cubitus valgus ulnar nerve may get stretchedleading to the weakness of intrinsic muscles


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Radio Ulnar Joint-Prasath