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Thumb Function and Electromyography Result after Modified Camitz Tendon Transfer.

Claire Marie Durban1, Bernard Antolin1, Chung Ying Sau1

  • 1* Division of Hand and Foot Surgery, Department of Orthopaedics and Traumatology, Queen Mary Hospital, Hong Kong, S.A.R., China.

The Journal of Hand Surgery Asian-Pacific Volume
|August 5, 2017
PubMed
Summary

The modified Camitz opponensplasty effectively restores thumb function in severe carpal tunnel syndrome patients. The palmaris longus (PL) muscle appears to augment abductor pollicis brevis (APB) recovery, enhancing grip strength.

Keywords:
Carpal Tunnel SyndromeHand FunctionMedian Nerve ElectromyographyModified Camitz Opponensplasty

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Area of Science:

  • Orthopedic Surgery
  • Hand Surgery
  • Reconstructive Surgery

Background:

  • Opponensplasty techniques aim to restore thumb function.
  • Modified Camitz opponensplasty is a surgical technique combined with carpal tunnel release.
  • This procedure supports thumb abduction during abductor pollicis brevis (APB) muscle recovery.

Purpose of the Study:

  • To assess abductor pollicis brevis (APB) and palmaris longus (PL) muscle recovery and activity after modified Camitz opponensplasty.
  • To evaluate thumb opposition and abduction function post-surgery.

Main Methods:

  • Review of 21 patients with severe carpal tunnel syndrome who underwent modified Camitz opponensplasty.
  • Evaluation of thumb function using Van Wetter Apogee test, Kapandji index, tripod pinch, and power grip.
  • Electromyography (EMG) for APB recovery assessment and ultrasonography for PL activity evaluation.

Main Results:

  • Twenty patients achieved 80% of contralateral thumb abduction height; 13 had a good Kapandji index.
  • Significant improvements in grip and tripod pinch strength were observed.
  • Palmaris longus (PL) activity correlated with abductor pollicis brevis (APB) recovery, suggesting a synergistic role even with full APB recovery.

Conclusions:

  • Modified Camitz opponensplasty is a viable surgical option for severe carpal tunnel syndrome.
  • The procedure effectively improves thumb function and strength.
  • The palmaris longus tendon may play a crucial role in augmenting thumb function post-surgery.