The condition known as de Quervain tenosynovitis, a stenosing tenosynovitis that affects the EPB and APL, was first described by Fritz de Quervain in 1895. These synovial sheaths traverse through the fibroosseous tunnels formed by the extensor retinaculum at the level of the distal radioulnar joint (DRUJ), organized in six distinct anatomic compartments. As the tendons near and course over the wrist, they are covered by synovial sheaths formed from the outer layer of each individual tendon ( Fig. The tendons originate in the forearm and course across the wrist to insert on their target of motion. Furthermore, anatomic prominences, osseous deformities related to prior fracture, and bony changes caused by osteoarthritis can result in tendon attrition and eventual rupture. Because of their superficial location, isolated tears of any of these tendons can occur as a result of lacerations, crush injuries, burns, and bites. Tenosynovitis may also result from an inflammatory process or infection. Injury to these tendons is often the result of repetitive trauma and overuse and most commonly presents as tendinosis and tenosynovitis. Nine major extensor tendons are located at the dorsal aspect of the wrist. MRI of the wrist is commonly performed to evaluate individuals with wrist pain, allowing detailed anatomic evaluation and accurate characterization of wrist abnormalities, including those involving the dorsal extensor wrist tendons.
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