Fiberoptic measurement of tendon forces is influenced by skin movement artifact

Ahmet Erdemir, Andrew J. Hamel, Stephen Jacob Piazza, Neil Sharkey

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Fiberoptic cables have previously been used for tendon force measurements in vivo. To measure forces in the Achilles tendon, a cable is passed mediolaterally through the skin and tendon, transverse to the loading axis. As the tendon is loaded, its fibers compress the cable and modulate the intensity of transmitted light, which can be related to tendon force by an in situ calibration. The relative movement between skin and tendon at the cable entry and exit sites may cause error by bending the cable and thus altering transducer output. Cadaver simulations of walking were conducted to compare fiberoptic measurements of Achilles tendon forces to known loads applied to the tendon by actuators attached in series. Force measurement errors, which were high when the skin was intact (RMS errors 24-81% peak forces), decreased considerably after skin removal (RMS errors 10-33% peak forces). The fiberoptic transducer is a useful tool for measurement of tendon forces in situ under natural loading conditions when skin can be removed, but caution should be exercised during in vivo use of this technique or under circumstances where skin is in contact with the fiberoptic cable at the insertion and exit sites.

Original languageEnglish (US)
Pages (from-to)449-455
Number of pages7
JournalJournal of Biomechanics
Volume36
Issue number3
DOIs
StatePublished - Mar 1 2003

Fingerprint

Tendons
Artifacts
Skin
Cables
Achilles Tendon
Transducers
Force measurement
Cadaver
Calibration
Walking
Measurement errors
Light
Actuators
Fibers

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

Cite this

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abstract = "Fiberoptic cables have previously been used for tendon force measurements in vivo. To measure forces in the Achilles tendon, a cable is passed mediolaterally through the skin and tendon, transverse to the loading axis. As the tendon is loaded, its fibers compress the cable and modulate the intensity of transmitted light, which can be related to tendon force by an in situ calibration. The relative movement between skin and tendon at the cable entry and exit sites may cause error by bending the cable and thus altering transducer output. Cadaver simulations of walking were conducted to compare fiberoptic measurements of Achilles tendon forces to known loads applied to the tendon by actuators attached in series. Force measurement errors, which were high when the skin was intact (RMS errors 24-81{\%} peak forces), decreased considerably after skin removal (RMS errors 10-33{\%} peak forces). The fiberoptic transducer is a useful tool for measurement of tendon forces in situ under natural loading conditions when skin can be removed, but caution should be exercised during in vivo use of this technique or under circumstances where skin is in contact with the fiberoptic cable at the insertion and exit sites.",
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Fiberoptic measurement of tendon forces is influenced by skin movement artifact. / Erdemir, Ahmet; Hamel, Andrew J.; Piazza, Stephen Jacob; Sharkey, Neil.

In: Journal of Biomechanics, Vol. 36, No. 3, 01.03.2003, p. 449-455.

Research output: Contribution to journalArticle

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