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Anterior interosseous syndrome is a medical condition in which damage to the anterior interosseous nerve (AIN), a distal motor and sensory branch of the median nerve, classically with severe weakness of the pincer movement of the thumb and index finger, and can cause transient pain in the wrist (the terminal, sensory branch of the AIN innervates the bones of the carpal tunnel).
Illustration of an Ankle Stirrup Splint Finger splint. Ankle stirrup – Used for the ankles. [2] Finger splints – Used for the fingers. A "mallet" or baseball finger is a rupture of the extensor tendon and sometimes including a fracture. While surgery may be necessary such an injury may heal if placed in a finger splint. [3] Nasal splint [4]
A mallet finger, also known as hammer finger or PLF finger or Hannan finger, is an extensor tendon injury at the farthest away finger joint. [2] This results in the inability to extend the finger tip without pushing it. [3] There is generally pain and bruising at the back side of the farthest away finger joint. [3]
These are especially concerning, as it may indicate a complete tear of the extensor digitorum tendon. If left untreated, this may lead to permanent DIP extensor lag (inability to fully straighten the finger). [8] A variation of the jammed finger where the extensor tendons on the back of the fingers are damaged is known as 'mallet finger'. [9]
If patients do have median nerve palsy, occupational therapy or wearing a splint can help reduce the pain and further damage. Wearing a dynamic splint, which pulls the thumb into opposition, will help prevent an excess in deformity. This splint can also assist in function and help the fingers flex towards the thumb.
The theory is that the radial nerve becomes irritated and/or inflamed from friction caused by compression by muscles in the forearm. [1]Some speculate that radial tunnel syndrome is a type of repetitive strain injury (RSI), but there is no detectable pathophysiology and even the existence of this disorder is questioned.
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