tailieunhanh - báo cáo hóa học:" Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion | Journal of Orthopaedic Surgery and Research BioMed Central Open Access Technical Note Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion Michael J Bey Stephanie K Kline Scott Tashman and Roger Zauel Address Henry Ford Health Systems Department of Orthopaedics Bone and Joint Center E R 2015 2799 W. Grand Blvd Detroit MI 48202 USA Email Michael J Bey - bey@ Stephanie K Kline - brock@ Scott Tashman - tashman@ Roger Zauel - zauel@ Corresponding author Published 4 September 2008 Received 8 May 2008 Journal of Orthopaedic Surgery and Research 2008 3 38 doi 1749-799X-3-38 Accepted 4 September 2008 This article is available from http content 3 1 38 2008 Bey et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Accurately measuring in-vivo motion of the knee s patellofemoral PF joint is challenging. Conventional measurement techniques have largely been unable to accurately measure three-dimensional in-vivo motion of the patella during dynamic activities. The purpose of this study was to assess the accuracy of a new model-based technique for measuring PF joint motion. Methods To assess the accuracy of this technique we implanted tantalum beads into the femur and patella of three cadaveric knee specimens and then recorded dynamic biplane radiographic images while manually flexing and extending the specimen. The position of the femur and patella were measured from the biplane images using both the model-based tracking system and a validated dynamic radiostereometric analysis RSA technique. Model-based tracking was compared to dynamic RSA by computing measures of bias precision .