What are extensor tendon zones?
Zone I refers to the area from the DIP joint to the fingertip; zone II encompasses the middle phalanx; zone III refers to the PIP joint; zone IV is over the proximal phalanx; zone V refers to the MP joint; zone VI encompasses the metacarpal and zone VII is over the wrist (see Fig.
How many zones are in the extensor tendon?
The dorsum of the hand, wrist, and forearm are divided into nine anatomic zones to facilitate classification and treatment of extensor tendon injuries.
What is an extensor tendon laceration?
Extensor tendon lacerations occur when an object penetrates the tissues of the hand and severs the tendons on the back of the hand or fingers. This damage may be intentional or accidental, and often involves broken glass, jagged metal, or sharp tools. Mallet Finger refers to a drooping end-joint of a finger.
What are the extensor tendons of the hand?
Extensor tendons are thin tendons located on the back of the hand, just under the skin. These particular tendons allow you to straighten your fingers and thumb and can be injured by a simple cut or jammed finger.
How many extensor tendons are in the thumb?
The tendon most often used as a transfer is one of the two extensor tendons to the index finger. You should discuss the precise details of any planned surgery with your Surgeon.
What is tendon laceration?
Tendon lacerations are an injury to the tendon that most commonly impacts the flexor and extensor tendons of the hand. A cut due to a knife or glass is the most common cause of these types of injuries.
What causes common extensor tendon tear?
Causes of Common Extensor Tendon Origin Rupture Common causes may include: Activity that requires repetitive motion of the forearm such as painting, typing, weaving, gardening, lifting heavy objects, and sports. Overuse of the forearm muscles. Direct trauma as with a fall, work injury, or motor vehicle accident.
Why was no man’s land called that?
Church elders used the term for territories lying uneasily between established parishes. And when the bubonic plague ravaged the country, “no man’s land” could refer to a mass burial ground, where no living person would dare tread.
What are the muscles of the common extensor tendons of the elbow?
The common extensor tendon that originates from the lateral epicondyle of the elbow is directly involved. The extensor carpi radialis brevis (ECRB) and longus, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris come together to form the common extensor tendon.
What are the four zones of extensor tendon injury?
Zones of Extensor Tendon Injuries Zone I • Disruption of terminal extensor tendon Zone V • Disruption over MCP joint of digit or Zone VI • Disruption over the metacarpal • Nerve Zone VII • Disruption at the wrist joint • Must r Zone VIII • Disruption at the distal forearm • Ext
Can a laceration of the extensor tendon be repaired?
For lacerations without associat-ed injury, the extensor tendon canbe repaired emergently or in adelayed primary fashion after irri-gation, debridement, and loose clo-sure of the wound. If the repair isdelayed, it should be performedwithin 7 days, before the tendonends retract or soften.
How is the extensor mechanism of the hand divided?
The extensor mechanism of the hand can be divided into eight zones (Fig. 1) to aid in the evalua- tion and treatment of acute in- juries.13 The even-numbered zones are over bones, and the odd-num- bered zones are over joints.
How does relative motion splint help with extensor tendon injury?
Relative motion splint (yoke splint) positions the involved MCP joint in hyperextension relative to adjacent digits. Indications after zone 4-7 extensor tendon repair. advantages over static immobilization and dynamic splinting increased early active range of motion. decreases strain on tendon and prevents adhesions.