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Finger flexor rigidity in the healthy population.

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This study measured flexor tendon rigidity in healthy hands using ultrasound, establishing a reference scale. Findings reveal differences in tendon rigidity based on hand dominance, finger, and sex, aiding trigger finger research.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • The precise role of hand flexor tendons in trigger finger remains unclear.
  • Understanding normal flexor tendon properties is crucial for diagnosing and treating hand pathologies.
  • Ultrasound offers a non-invasive method to assess tendon biomechanics.

Purpose of the Study:

  • To quantify flexor tendon rigidity in the first pulley region of healthy hands.
  • To establish a normative rigidity scale for digital flexor tendons.
  • To provide a baseline for comparing tendon rigidity in trigger finger patients.

Main Methods:

  • Ultrasound elastography and color Doppler were used to measure flexor tendon rigidity.
  • 35 healthy volunteers were assessed across different fingers, sexes, and age groups.
  • Rigidity was quantified in kilopascals (kPa) below the A1 pulley.

Main Results:

  • Normal flexor tendon rigidity ranged from 233.1 to 962.8 kPa (average 486.42 kPa).
  • Dominant hand flexor tendons exhibited greater rigidity.
  • Significant differences were observed between thumb and other finger tendon rigidity, and in males, the dominant ring finger tendon was stiffer.

Conclusions:

  • A normative scale for flexor tendon rigidity in the hand was established using ultrasound.
  • This scale provides a valuable reference for comparing tendon properties in conditions like trigger finger.
  • Tendon rigidity is influenced by hand dominance, specific finger, and sex, offering insights into biomechanical variations.