ECU Synergy Test

Published July 2, 2026 Read time 1 min read Readers 2
ECU Synergy Test

What is the "ECU Synergy Test" used for?

  • This test is used to diagnose extensor carpi ulnaris tendinitis.

How to perform the "ECU Synergy Test"?

  • The patient sits with the arm supported on a table with the elbow flexed 90 degrees and the wrist in neutral. 
  • The examiner grasps the patient’s thumb and long fingers with one hand and palpates the extensor carpi ulnaris tendon with the other hand. 
  • The patient then isometrically abducts the thumb against resistance.
  • The extensor carpi ulnaris and flexor carpi ulnaris will contract to stabilize the wrist

What is the positive result?

  • Pain along the dorsal ulnar aspect of the wrist is considered a positive test.