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The ECU tendon, or extensor carpi ulnaris, is one of the major wrist tendons. It is on the ulnar side of the wrist, the same side as the small finger. The tendon starts on the back of the forearm and crosses the wrist joint directly on the side.   

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Source: Verywell Health

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  • American Society for Surgery of the Hand
  • AO Trauma
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  • The J. Robert Gladden Orthopaedic Society
  • American Board of Orthopaedic Surgery