Extensor Tendon Anatomy Hand

Zone i disruption of terminal extensor tendon distal to or at the dip joint of the fingers and ip joint of the thumb epl mallet finger. A flexor tendon injury can cause loss of flexion.

Extensor Tendons Injury And Deformity

Understanding of and familiarity with the extensor anatomy of the hand and ﬁngers by the radiologist is crucial for better assessment of pathologic conditions with mr imaging and optimization of this mo dality as a diagnostic tool.

Extensor tendon anatomy hand. Zone ii disruption of tendon over middle phalanx or proximal phalanx of thumb epl zone iii. Rheumatoid arthritis ra is the most common underlying etiology of tendon rupture in the hand and wrist. Ten years later he described the process of attritional rupture of the digital extensor tendons in the rheumatoid hand with which his name has become associated.

Extensor denotes their action which is to extend or open flat joints in the hand. Extensor tendons are just under the skin. Thank you for rating.

Zones of extensor tendon injuries. Extensor tendon injuries and tenosynovitis represent clinical situations in which knowledge of this anatomy is use. They can be injured by a minor cut or jamming a finger which may cause the thin tendons to rip from their attachment to bone.

Extrinsic denotes their location outside the hand. Please vote below and help us build the most advanced adaptive learning platform in medicine. Extensor tendons are thin tendons located on the back of the hand just under the skin.

The ability to flex the fingers consists of a system of flexor muscles in the forearm and their tendons are inserted into the bones of the fingers. If not treated it may be hard to straighten one or more joints. These particular tendons allow you to straighten your fingers and thumb and can be injured by a simple cut or jammed finger.

The extensor tendon compartments of the wrist are six tunnels which transmit the long extensor tendons from the forearm into the hand. The 6 extensor compartments of the wrist and intrinsic muscles of the hand comprise 23 musculotendinous units. They lie next to the bone on the back of the hands and fingers and straighten the wrist fingers and thumb figure 1.

Each tunnel is lined internally by a synovial sheath and separated from one another by fibrous septa. The extrinsic extensor muscles of the hand are located in the back of the forearm and have long tendons connecting them to bones in the hand where they exert their action. They are located on the posterior aspect of the wrist.

The extensor tendon system of the wrist hand and fingers is more complex than the flexor tendon system.

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