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Triggering after partial tendon laceration

M M al-Qattan1, J C Posnick, K Y Lin

  • 1Division of Plastic Surgery, University of Toronto, Ontario, Canada.

Journal of Hand Surgery (Edinburgh, Scotland)
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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Tendons can bunch up after injury, causing triggering. This bunching often resolves naturally during healing, but sometimes forms a flap if not incorporated.

Area of Science:

  • Orthopedics
  • Biomedical Engineering
  • Veterinary Medicine

Background:

  • Tendon injuries can lead to functional impairments like triggering.
  • The mechanisms behind triggering and associated pathologies, such as tendon flap formation, require further elucidation.
  • Understanding the natural healing process of tendons is crucial for developing effective treatment strategies.

Purpose of the Study:

  • To investigate the mechanisms of triggering and tendon flap formation following partial flexor digitorum profundus tendon lacerations in sheep.
  • To observe the natural healing process without surgical repair or immobilization.
  • To determine the relationship between tendon fiber bunching and the development of triggering and flap formation.

Main Methods:

  • A transverse laceration of 50% width was created in the flexor digitorum profundus tendons of adult sheep hind limbs.

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  • No surgical repair or post-operative immobilization was applied.
  • Tendon healing and the development of triggering/flap formation were studied at various intervals post-injury.

    • Main Results:

    • Triggering was primarily caused by the bunching of tendon fibers proximal or distal to the laceration site, not scar formation.
    • In most cases, the bunched tendon fibers were incorporated into the healing process, leading to spontaneous resolution of triggering.
    • Failure of this incorporation resulted in the formation of a tendon flap in two instances.

    Conclusions:

    • Tendon fiber bunching is the primary cause of triggering after partial tendon lacerations.
    • Spontaneous resolution of triggering is possible through the incorporation of bunched fibers into the healing tendon.
    • Tendon flap formation is a potential complication when fiber incorporation fails.