In vivo application of an optical segment tracking approach for bone loading regimes recording in humans: A reliability study

Peng-Fei Yang, Maximilian Sanno, Bergita Ganse, Timmo Koy, Gert-Peter Brüggemann, Lars Peter Müller, Jörn Rittweger

Publikation: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung

Abstract

This paper demonstrates an optical segment tracking (OST) approach for assessing the in vivo bone loading regimes in humans. The relative movement between retro-reflective marker clusters affixed to the tibia cortex by bone screws was tracked and expressed as tibia loading regimes in terms of segment deformation. Stable in vivo fixation of bone screws was tested by assessing the resonance frequency of the screw-marker structure and the relative marker position changes after hopping and jumping. Tibia deformation was recorded during squatting exercises to demonstrate the reliability of the OST approach. Results indicated that the resonance frequencies remain unchanged prior to and after all exercises. The changes of Cardan angle between marker clusters induced by the exercises were rather minor, maximally 0.06°. The reproducibility of the deformation angles during squatting remained small (0.04°/m-0.65°/m). Most importantly, all surgical and testing procedures were well tolerated. The OST method promises to bring more insights of the mechanical loading acting on bone than in the past.

OriginalspracheEnglisch
ZeitschriftMedical Engineering Physics
Jahrgang36
Ausgabenummer8
Seiten (von - bis)1041–1046
Seitenumfang6
ISSN1873-4030
DOIs
PublikationsstatusVeröffentlicht - 03.06.2014

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