For treatment of flexor tendon injuries, the flexor aspect of the hand is divided into five zones
Zone I extends from the tip of the finger to the middle of middle phalanx. Its contains only flexor digitorum profundus. [see below] Injuries in zone I would produce cut to flexor digitorum profundus only.
Zone II extends from the middle of the middle phalanx to distal palmar crease. It contains both flexor tendon superficialis and flexor tendon profundus. It has been called “No Man’s Land” or “No Man’s Zone” because repair in this zone is very difficult.
Both the tendons are interwoven and surrounded by a number of pulleys in this zone
It extends from distal palmar crease to the distal edge of flexor carpal ligament. It is also called lumbrical zone because of the presence of lumbricals in this zone.
It is the zone under the carpal ligament
This zone is proximal to wrist joint
In case of thumb the third zone is very small. See below.
These zones are important from treatment point of view of flexor tendon injuries.
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