Publisher DOI: 10.1302/0301-620X.94B3.27550
Title: Telemetric assessment of bone healing with an instrumented internal fixator : a preliminary study
Language: English
Authors: Seide, Klaus 
Aljudaibi, M. 
Weinrich, N. 
Kowald, B. 
Jürgens, Christian 
Müller, Jörg 
Faschingbauer, M. 
Issue Date: 1-Nov-2011
Publisher: American Orthopaedic Association
Source: Journal of Bone and Joint Surgery - Series B 3 (94 B): 398-404 (2012)
Abstract (english): 
In an interdisciplinary project involving electronic engineers and clinicians, a telemetric system was developed to measure the bending load in a titanium internal femoral fixator. As this was a new device, the main question posed was: what clinically relevant information could be drawn from its application? As a first clinical investigation, 27 patients (24 men, three women) with a mean age of 38.4 years (19 to 66) with femoral nonunions were treated using the system. The mean duration of the nonunion was 15.4 months (5 to 69). The elasticity of the plate-callus system was measured telemetrically until union. Conventional radiographs and a CT scan at 12 weeks were performed routinely, and healing was staged according to the CT scans. All nonunions healed at a mean of 21.5 weeks (13 to 37). Well before any radiological signs of healing could be detected, a substantial decrease in elasticity was recorded. The relative elasticity decreased to 50% at a mean of 7.8 weeks (3.5 to 13) and to 10% at a mean of 19.3 weeks (4.5 to 37). At 12 weeks the mean relative elasticity was 28.1% (0% to 56%). The relative elasticity was significantly different between the different healing stages as determined by the CT scans. Incorporating load measuring electronics into implants is a promising option for the assessment of bone healing. Future application might lead to a reduction in the need for exposure to ionising radiation to monitor fracture healing. ©2012 British Editorial Society of Bone and Joint Surgery.
ISSN: 2044-5377
Journal: Journal of Bone and Joint Surgery - Series B 
Institute: Mikrosystemtechnik E-7 
Document Type: Article
More Funding information: Deutsche Gesetzliche Unfallversicherung
Bundesministerum für Bildung und Forschung
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