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Updated: Jan 15, 2026

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Forearm Extensor Tendon Fractional Lengthening: An Anatomic Feasibility Study.

Alex Sarosi1, Diala Burjak2, Peter J Taub1

  • 1Division of Plastic and Reconstructive Surgery, Mount Sinai Medical Center, New York, NY.

The Journal of Hand Surgery
|October 9, 2025
PubMed
Summary
This summary is machine-generated.

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Fractional tendon lengthening (FL) is challenging in forearm extensors due to limited muscle-tendon overlap. Most extensor muscles have insufficient areas for safe FL, suggesting alternative methods are needed.

Area of Science:

  • Anatomy
  • Orthopedic Surgery
  • Biomechanics

Background:

  • Fractional tendon lengthening (FL) is a common flexor tendon surgical technique.
  • The feasibility of FL for forearm extensor muscles is not well-established.
  • Understanding extensor muscle-tendon anatomy is crucial for surgical planning.

Purpose of the Study:

  • To evaluate the anatomy of forearm extensor muscles.
  • To analyze the muscle-tendon overlap extent in extensors.
  • To identify safe zones for performing fractional tendon lengthening (FL).

Main Methods:

  • Dissection of nine adult cadaver forearms.
  • Definition and measurement of muscle-tendon overlap zones.
  • Calculation of the useful zone (UZ) for FL, excluding distal areas.
Keywords:
Cadaverextensor musclefeasibility studyfractional lengtheningtendon

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Main Results:

  • Significant variability in the useful zone (UZ) was observed across forearm extensor muscles.
  • Wrist extensors like extensor carpi ulnaris had larger UZs (5.1 cm) compared to extensor carpi radialis brevis (0.6 cm) and longus (0.1 cm).
  • Finger extensors showed varied UZs, with extensor pollicis longus (5 cm) and extensor digitorum communis (3.6 cm) having larger zones than extensor indicis proprius (1.7 cm).

Conclusions:

  • The available area for fractional tendon lengthening (FL) in forearm extensors is highly dependent on individual muscle anatomy and varies significantly.
  • Most forearm extensor muscles possess limited musculotendinous junction areas suitable for free lengthening.
  • Surgeons should consider alternative tendon lengthening techniques for extensor reconstruction due to anatomical limitations.