Mallet thumb (MRI)
Pain and loss of extension in the IP joint of the thumb after collision with an opponent in a handball game. No specific signs on radiographs of the thumb.
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Signal increase and discontinuity of the distal slip of the extensor pollicis longus (EPL) tendon near its insertion at the base of the 1st distal phalanx.
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These lesions are normally treated conservatively. MRI can be used to localise the ends of the ruptured tendon.