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Related Experiment Videos

Excursion of prime wrist tendons

E Horii1, K N An, R L Linscheid

  • 1Department of Orthopedics, Mayo Clinic/Mayo Foundation, Rochester, Minn 55905.

The Journal of Hand Surgery
|January 1, 1993
PubMed
Summary

A new system measures wrist tendon movement and joint angles simultaneously. This allows accurate calculation of wrist tendon moment arms, crucial for understanding wrist biomechanics.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Human Anatomy

Background:

  • Understanding wrist joint biomechanics is essential for diagnosing and treating wrist injuries.
  • Accurate measurement of tendon moment arms is critical for analyzing wrist joint function.

Purpose of the Study:

  • To develop and validate a novel system for simultaneous measurement of wrist tendon excursion and joint rotation angles.
  • To calculate instantaneous moment arms for prime wrist motor tendons.
  • To investigate the influence of forearm rotation on wrist tendon function.

Main Methods:

  • Development of a system utilizing an electric potentiometer and electromagnetic tracking device.
  • Measurement of five prime wrist motor tendons in fresh frozen cadavers.
  • Calculation of tendon moment arms based on the relationship between tendon excursion and joint angular displacement.

Main Results:

  • The developed system provided consistent and accurate calculations of tendon moment arms across various wrist motions.
  • The flexor carpi ulnaris tendon demonstrated the largest moment contribution to the wrist joint.
  • Forearm rotation significantly affected the extensor carpi ulnaris tendon's excursion during flexion-extension and radioulnar deviation.

Conclusions:

  • The novel system enables precise, continuous measurement of wrist kinematics and tendon function.
  • Tendon moment arm calculations are reliable and correlate with anatomical findings.
  • Forearm position plays a significant role in the biomechanical function of specific wrist tendons, particularly the extensor carpi ulnaris.

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