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Extensor Carpi Ulnaris Tendonitis

synonyms:Extensor Carpi Ulnaris Tendonitis, ECU tendonitis

ECU Tendonitis ICD-9

  • 727.05 (other tenosynovitis of hand and wrist)

ECU Tendonitis Etiology / Epidemiology / Natural History

ECU Tendonitis Anatomy

  • The ECU is maintained in its groove by the extensor retinaculum, the linea jugata and the ECU subsheath.
  • ECU subsheath = 2cm stout fibroosseous tunnel encircling the ECU in the ulnar groove.
  • linea jugata = soft tissue band running from the proximal medial border of the ulnar styloid and inserting on the extensor retinaculum.
  • In full suppination the ECU is a wrist extensor. In full pronation the ECU produces ulnar deviation.

ECU Tendonitis Clinical Evaluation

  • Tenderness along the sixth dorsal compartment / ECU
  • Pain increased by resisted ulnar deviation and forced radial deviation.
  • Common in rowing and racquet sports

ECU Tendonitis Xray / Diagnositc Tests

  • P/A and lateral wrist xrays usually normal.

ECU Tendonitis Classification / Treatment

  • Acute: cock-up wrist splint, nsaids, acitivity modification.
  • Subacute (patients who have failed acute management): Corticosteriod injection 6th dorsal compartment.
  • Chronic (patients who have 2 or more injections): Surgical release can be considered, but associated pathology must be ruled out first. (Kip PC, J Hand Surg 1994;19Am:599)

ECU Tendonitis Associated Injuries / Differential Diagnosis

ECU Tendonitis Complications

  • ECU dislocation / subluxation

ECU Tendonitis Follow-up Care

ECU Tendonitis Review References

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