DocumentCode :
333127
Title :
Linear modelling and Fourier spectroscopy of stress-relaxation in the cervical spine
Author :
Holmes, Andrew D. ; Fang, Jing
Author_Institution :
Dept. of Orthopaedic Surgery, Hong Kong Univ., Hong Kong
Volume :
5
fYear :
1998
fDate :
28 Oct-1 Nov 1998
Firstpage :
2509
Abstract :
Single joints of the cervical spine were subject to axial compressive loads and the load relaxation recorded for 15 minutes. Isochronal plots of stress against strain were plotted for each specimen and showed high linear correlation coefficients (>0.955). Accordingly, a linear model was chosen and fitted to data obtained from a fuller range (3 hours) of the complete relaxation curve. The relaxation times extracted from this model were approximately 10 minutes and 5 hours. Fourier transform of the relaxation curve allows the storage modulus and the loss modulus of the relaxation spectrum to be shown separately as functions of frequency. Fourier analysis shows that the cervical spine has a wide and smooth distribution of relaxation times. Examination of the higher frequency components of the relaxation in the region of 1 to 20 Hz show the loss modulus to be almost flat and tending towards zero. This work shows that while the disc is capable of dissipating a large proportion of the applied strain energy, it can only do this slowly, and the discs of the cervical spine are inefficient as `shock absorbers´ of axial loads
Keywords :
Fourier transform spectroscopy; biomechanics; orthopaedics; physiological models; stress relaxation; 1 to 20 Hz; 15 min to 5 h; applied strain energy; axial compressive loads; cervical spine; higher frequency components; isochronal plots; linear correlation coefficients; linear modelling; loss modulus; relaxation time; shock absorbers; storage modulus; Capacitive sensors; Compressive stress; Data mining; Fourier transforms; Frequency; Orthopedic surgery; Shock absorbers; Spectroscopy; Spine; Viscosity;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, 1998. Proceedings of the 20th Annual International Conference of the IEEE
Conference_Location :
Hong Kong
ISSN :
1094-687X
Print_ISBN :
0-7803-5164-9
Type :
conf
DOI :
10.1109/IEMBS.1998.744955
Filename :
744955
Link To Document :
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