Abstract
Knee-joint sounds or vibroarthrographic (VAG) signals contain diagnostic information related to the roughness, softening, breakdown, or the state of lubrication of the articular cartilage surfaces. Objective analysis of VAG signals provides features for pattern analysis, classification, and noninvasive diagnosis of knee-joint pathology of various types. We propose parameters related to signal variability for the analysis of VAG signals, including an adaptive turns count and the variance of the mean-squared value computed during extension, flexion, and a full swing cycle of the leg, for the purpose of classification as normal or abnormal, that is, screening. With a database of 89 VAG signals, screening efficiency of up to 0.8570 was achieved, in terms of the area under the receiver operating characteristics curve, using a neural network classifier based on radial-basis functions, with all of the six proposed features. Using techniques for feature selection, the turns counts for the flexion and extension parts of the VAG signals were chosen as the top two features, leading to an improved screening efficiency of 0.9174. The proposed methods could lead to objective criteria for improved selection of patients for clinical procedures and reduce healthcare costs.
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Acknowledgments
This work was supported by the Doctoral Program Foundation of the Ministry of Education of China under Grant No. 20060013007 awarded to Y. F. Wu, and by the University of Calgary in the form of a “University Professorship” awarded to R. M. Rangayyan. R. M. Rangayyan is a Visiting Professor at the Beijing University of Posts and Telecommunications. We thank Yachao Zhou and Xiaoxuan Zhu for technical assistance and review of this paper.
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Rangayyan, R.M., Wu, Y. Analysis of Vibroarthrographic Signals with Features Related to Signal Variability and Radial-Basis Functions. Ann Biomed Eng 37, 156–163 (2009). https://doi.org/10.1007/s10439-008-9601-1
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DOI: https://doi.org/10.1007/s10439-008-9601-1