title: [Assessment of bone healing during callus distraction by an automatic torsional stiffness metering system].
abstract: The present article describes a newly developed device for the quantitative assessment of torsional in vivo stiffness of regenerating bone under callus distraction. Both the design and function of this device, and its use during bony consolidation are discussed. The device exhibited an accuracy of +/- 18% for stiffness under 0.1 Nm/degree, and +/- 5% stiffness above 0.1 Nm/degree. The average accuracy was +/- 14%. The data scatter for the stiffness measurement ranged between +/- 1.43% and +/- 7.68% (average: +/- 3.99%). The precision of a test machine was between +/- 0.01% and +/- 11.3% (average: +/- 3.65%). The method has the following advantages over existing methods for investigating healing: 1. no need to dismantle the external fixation for measurement; 2. preservation of the bone axis with minimal risk of misalignment during the bone healing process; 3. minimal technical requirements, with easy, noninvasive measurement; 4. no exposure to X-radiation.
authors.affiliation: Orthopädische Klinik der Medizinischen Hochschule Hannover.
authors.forename: F
authors.initials: F
authors.lastname: Thorey
authors.forename: H
authors.initials: H
authors.lastname: Windhagen
authors.forename: D
authors.initials: D
authors.lastname: Linnenberg
authors.forename: O
authors.initials: O
authors.lastname: Nölle
authors.forename: O
authors.initials: O
authors.lastname: Maciejewski
authors.forename: C
authors.initials: C
authors.lastname: Spies
mesh_terms: D001861:Bone Regeneration / Q000502:physiology*; D004867:Equipment Design; D016267:External Fixators; D006801:Humans; D008838:Microcomputers; D019857:Osteogenesis, Distraction / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012984:Software; D013718:Tensile Strength; D013977:Tibia / Q000503:physiopathology; D014102:Torsion Abnormality; D016474:Weight-Bearing / Q000502:physiology
vernacular_title: Erfassung der Knochenheilung während der Kallusdistraktion durch ein automatisiertes torsionales Steifigkeitsmesssystem.