gms | German Medical Science

14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT)

17.06. - 21.06.2019, Berlin

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Stimulated Grip Strength Testing: Validation of Novel Method for Functional Assessment

Meeting Abstract

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  • presenting/speaker Philip Hanwright - Johns Hopkins University School of Medicine, Baltimore, United States
  • Jennifer Rath - Johns Hopkins University School of Medicine, Baltimore, United States
  • Nicholas Von Guionneau - Johns Hopkins University School of Medicine, Baltimore, United States
  • Thomas Harris - Johns Hopkins University School of Medicine, Baltimore, United States
  • Karim Sarhane - Johns Hopkins University School of Medicine, Baltimore, United States
  • Stephen Kemp - University of Michigan School of Medicine, Ann Arbor, United States
  • W. P. Andrew Lee - Johns Hopkins University School of Medicine, Baltimore, United States
  • Ahmet Hoke - Johns Hopkins University School of Medicine, Baltimore, United States
  • Paul Cederna - University of Michigan School of Medicine, Ann Arbor, United States
  • Sami Tuffaha - Johns Hopkins University School of Medicine, Baltimore, United States

International Federation of Societies for Surgery of the Hand. International Federation of Societies for Hand Therapy. 14th Triennial Congress of the International Federation of Societies for Surgery of the Hand (IFSSH), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT), 11th Triennial Congress of the International Federation of Societies for Hand Therapy (IFSHT). Berlin, 17.-21.06.2019. Düsseldorf: German Medical Science GMS Publishing House; 2020. DocIFSSH19-1485

doi: 10.3205/19ifssh1395, urn:nbn:de:0183-19ifssh13952

Veröffentlicht: 6. Februar 2020

© 2020 Hanwright et al.
Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). Lizenz-Angaben siehe http://creativecommons.org/licenses/by/4.0/.

Gliederung

Text

Objectives/Interrogation: Accurate and reliable assessment of functional recovery remains a challenge. Grip strength testing is a validated method for measuring function of the median nerve-innervated extrinsic digital flexors. Because the rat must be dangled by the tail to elicit grasp of the force transducer bar, this method is limited by behavioral variability and poor control of the vector and speed of distraction. Isometric tetanic force testing (ITFT) is accurate and reliable but does not allow for serial in vivo measurements. Combining aspects of these methods, we developed a novel technique for functional assessment in which grip strength is measured with percutaneous electrical stimulation of the median nerve to elicit grasping via isometric, tetanic contraction of the extrinsic digital flexors. We hypothesize that stimulated grip strength testing (sGST) provides greater accuracy and reliability than volitional grip strength testing (vGST) and similar quality data as ITFT with the added benefit of allowing for serial in vivo measurements (Figure 1 [Fig. 1]).

Methods: Function in both the right and left forelimbs was measured with sGST, vGST, and ITFT (n=10 rats), with the assumption that a perfect test would produce an average ratio (L/R) approaching one.

Results and Conclusions: sGST is more accurate than vGST in measuring side-to-side equivalence (p<0.05) and demonstrates comparable side-to-side equivalence as ITFT, but with less variability in measurements (Figure 2 [Fig. 2]). It is less technically demanding and time-consuming than ITFT and requires less expensive equipment to perform.