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The TFCC (triangular fibrocartilage complex) is a ligamentous/cartilage like complex similar to the meniscus of the knee located on the ulnar side of the wrist.
http://yanyanxu.com/wp-content/uploads/2008/01/trifibcc.gif
Hx: ulnar sided wrist pain following trauma and associated with activity related mechanical symptoms such as clicking.
PE: tenderness to palpation distal to ulnar head or at ulnar styloid . Tenderness against resisted radial deviation.
Plain film may show ulnar styloid avulsion or injury to carpal structures.
Refer to hand/wrist surgeon
Splint in ulnar gutter of long arm spica
MRI or arthrogram are studies of choice.
http://www.cobalthealth.co.uk/MImageGen.ashx?image=%2Fmedia%2F12951%2Fwrist-tfcc-tear-big.jpg&width=170&crop=true