Extensor Carpi Ulnaris (ECU) Tendon

The ECU tendon is on the back of the wrist on the small finger side. The ECU tendon is a common source of wrist pain, as there are many problems that can affect it.

The ECU tendon can get pinched in its tunnel or sheath. This is similar to DeQuervain's tendinitis, or trigger finger. ECU

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