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A comparative analysis of streaming potentials in vivo and in vitro

✍ Scribed by Dr. Mark W. Otter; Vincent R. Palmieri; Dadong D. Wu; Kristin G. Seiz; Laura A. MacGinitie; George Van B. Cochran

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
971 KB
Volume
10
Category
Article
ISSN
0736-0266

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✦ Synopsis

Abstract

Streaming potentials (SPs) measured in vivo at a specific site on intact cortical bone (canine tibia) have been compared with measurements from the same site in vitro, tested as an excised bone strip soaked in Hank's balanced salt solution. The amplitude of SPs per periosteal strain in vitro was larger in 13 tibias than in vivo (by an average X6.5 at 1 Hz), but values per transcortical strain difference were similar. In vitro, SP magnitudes rose more sharply to an asymptotic value as a function of bending frequency than did in vivo signals, possibly because of a difference in the internal state of canaliculi and/or Haversian systems. Similarly, SP response to step‐loading decreased to zero more slowly with time in vitro than in vivo. Difficulties encountered in preliminary measurements due to electrical shunting through electrolyte and soft tissues suggest the need for caution in using both in vivo and in vitro SP measurements to extrapolate to electric field strengths on the cellular level.

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