Opposition Transfer Using the Extensor Indicis Muscle and the Extensor Pollicis Brevis Tendon

Area of Science:

• Orthopedic surgery
• Hand surgery
• Reconstructive surgery

Background:

• Severe carpal tunnel syndrome (CTS) can lead to thenar muscle atrophy and thumb opposition dysfunction.
• Reconstruction of thumb opposition is crucial for restoring hand function.

Purpose of the Study:

• To introduce a novel surgical technique for thumb opposition reconstruction using extensor pollicis brevis and extensor indicis proprius tendons.
• To compare the efficacy of this novel technique with the traditional Camitz technique.

Main Methods:

• A comparative study involving patients with severe CTS and thumb opposition dysfunction.
• Surgical reconstruction using either the novel tendon transfer technique or the Camitz technique.
• Assessment of pre- and postoperative palmar abduction angle, thumb-ring finger opposition angle, and Kapandji score.
• Statistical analysis using repeated measures ANOVA and Mann-Whitney U test.

Main Results:

• The novel technique resulted in significant postoperative improvements in palmar abduction angle, thumb-ring finger opposition angle, and Kapandji score.
• Thumb-ring finger opposition angle was significantly superior in the novel technique group compared to the Camitz technique group.
• The novel technique demonstrated high efficacy in improving thumb pronation.

Conclusions:

• The novel tendon transfer technique is a promising and effective method for thumb opposition reconstruction in severe CTS.
• This technique offers stable thumb opposition without the need for a pulley, unlike the Camitz technique.
• Further research with larger sample sizes is recommended to validate these findings.