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Design Considerations of a Fiber Optic Pressure Sensor Protective Housing for Intramuscular Pressure Measurements

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Abstract

Intramuscular pressure (IMP), defined as skeletal muscle interstitial fluid pressure, reflects changes in individual muscle tension and may provide crucial insight into musculoskeletal biomechanics and pathologies. IMP may be measured using fiber-optic fluid pressure sensors, provided the sensor is adequately anchored to and shielded from surrounding muscle tissue. Ineffective anchoring enables sensor motion and inadequate shielding facilitates direct sensor-tissue interaction, which result in measurement artifacts and force-IMP dissociation. The purpose of this study was to compare the effectiveness of polyimide and nitinol protective housing designs to anchor pressure sensors to muscle tissue, prevent IMP measurement artifacts, and optimize the force-IMP correlation. Anchoring capacity was quantified as force required to dislodge sensors from muscle tissue. Force-IMP correlations and non-physiological measurement artifacts were quantified during isometric muscle activations of the rabbit tibialis anterior. Housing structural integrity was assessed after both anchoring and activation testing. Although there was no statistically significant difference in anchoring capacity, nitinol housings demonstrated greater structural integrity and superior force-IMP correlations. Further design improvements are needed to prevent tissue accumulation in the housing recess associated with artificially high IMP measurements. These findings emphasize fundamental protective housing design elements crucial for achieving reliable IMP measurements.

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Abbreviations

COD:

Coefficient of determination

IMP:

Intramuscular pressure

IMPmax :

Maximum intramuscular pressure

IMPmin :

Minimum intramuscular pressure

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Acknowledgments

This work was supported by the National Institutes of Health through the National Institute of Child Health and Human Development (R01HD31476), the National Institute of Arthritis and Musculoskeletal and Skin Diseases (T32AR56950), the National Institute on Aging (F30AG050390), as well as the National Science Foundation Graduate Research Fellowship (1255833) and Mayo Graduate School. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health or the National Science Foundation. Shanette Go thanks the Mayo Clinic Medical Scientist Training Program for fostering an outstanding environment for physician–scientist training.

Conflict of Interest

The authors declare that they have no conflicts of interest.

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Author notes

    Authors and Affiliations

    1. Mayo Graduate School, Mayo Clinic, Rochester, MN, USA

      Shanette A. Go, Elisabeth R. Jensen & Loribeth Q. Evertz

    2. Mayo Medical School, Mayo Clinic, Rochester, MN, USA

      Shanette A. Go

    3. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA

      Duane A. Morrow & Kenton R. Kaufman

    4. Department of Orthopaedic Surgery, University of California at San Diego, La Jolla, CA, USA

      Shawn M. O’Connor, Samuel R. Ward & Richard L. Lieber

    5. Department of Bioengineering, University of California at San Diego, La Jolla, CA, USA

      Shawn M. O’Connor, Samuel R. Ward & Richard L. Lieber

    6. Veterans Affairs San Diego Healthcare System, University of California at San Diego, La Jolla, CA, USA

      Richard L. Lieber

    7. Rehabilitation Institute of Chicago, Chicago, IL, USA

      Richard L. Lieber

    Authors
    1. Shanette A. Go
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    Correspondence to Kenton R. Kaufman.

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    Associate Editor Thurmon E. Lockhart oversaw the review of this article.

    Shanette A. Go and Elisabeth R. Jensen have contributed equally to this work.

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    Go, S.A., Jensen, E.R., O’Connor, S.M. et al. Design Considerations of a Fiber Optic Pressure Sensor Protective Housing for Intramuscular Pressure Measurements. Ann Biomed Eng 45, 739–746 (2017). https://doi.org/10.1007/s10439-016-1703-6

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    • DOI: https://doi.org/10.1007/s10439-016-1703-6

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