A study on the use of the Osstell apparatus to evaluate pedicle screw stability: An in-vitro study using micro-CT

Daisuke Nakashima, Ken Ishii, Morio Matsumoto, Masaya Nakamura and Takeo Nagura

PLOS ONE, 2018, vol. 13, issue 6, 1-16

Abstract: Pull-out force and insertion torque have not been generally used as intraoperative measures for the evaluation of pedicle screw stability because of their invasiveness. On the other hand, resonance frequency analysis is a non-invasive and repeatable technique that has been clinically used in dentistry to evaluate implant stability e.g. by the Osstell apparatus. In this study, the characteristics of the implant stability quotient (ISQ) value obtained by the Osstell apparatus in the field of spinal surgery were investigated. Biomechanical test materials simulating human bone were used to provide a comparative platform for evaluating each fixation strength measure, including pull-out force, insertion torque, and the ISQ value. To perform pull-out force measurement and to repeat pedicle screw insertion and removal, loosening was artificially created, and its effect was investigated. The grade of loosening was quantified on a micro-CT image after pedicle screw removal. In the comparison of the 3 fixation strength measures, the correlations of the ISQ value with the pull-out force (R2 = 0.339 p

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0199362

DOI: 10.1371/journal.pone.0199362

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