Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Use of embedded strain gages for the in-vitro study of proximal tibial cancellous bone deformation during knee flexion-extension movement: development, reproducibility and preliminary results of feasibility after frontal low femoral osteotomy | Sobczak et al. Journal of Orthopaedic Surgery and Research 2011 6 12 http content 6 1 12 JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH TECHNICAL NOTE Open Access Use of embedded strain gages for the in-vitro study of proximal tibial cancellous bone deformation during knee flexion-extension movement development reproducibility and preliminary results of feasibility after frontal low femoral osteotomy 1 1 2 2 2 Stéphane Sobczak Patrick Salvia Pierre-Michel Dugailly Philippe Lefevre Véronique Feipel Serge Van Sint Jan1 Marcel Rooze1 2 3 Abstract Background This paper reports the development of an in-vitro technique allowing quantification of relative not absolute deformations measured at the level of the cancellous bone of the tibial proximal epiphysis CBTPE during knee flexion-extension. This method has been developed to allow a future study of the effects of low femoral osteotomies consequence on the CBTPE. Methods Six strain gages were encapsulated in an epoxy resin solution to form after resin polymerisation six measurement elements ME . The latter were inserted into the CBTPE of six unembalmed specimens just below the tibial plateau. Knee motion data were collected by three-dimensional 3D electrogoniometry during several cycles of knee flexion-extension. Intra- and inter-observer reproducibility was estimated on one specimen for all MEs. Intra-specimen repeatability was calculated to determine specimen s variability and the error of measurement. A varum and valgum chirurgical procedure was realised on another specimen to observed CBTPE deformation after these kind of procedure. Results Average intra-observer variation of the deformation ranged from 8 to 9 mean coefficient of variation MCV respectively for extension and flexion movement. The coefficient of multiple correlations CMC ranged from to for flexion and extension. No phase shift of maximum strain peaks was observed. Inter-observer MCV averaged 23 and 28 for flexion and .
