Acoustic Transmission in Normal Human Hips: Structural Testing of Joint Symmetry
An acoustical technique has been developed for the measurement of structural symmetry of the hip joints. A mild vibratory force was applied to the sacrum and sound signals were picked up at both hips by a pair of microphones installed in two stethoscopes. These stethoscope–microphone assembles were calibrated to achieve a difference in relative sensitivity of less than 0.2 dB. The relative transmission of sound signals was analysed and compared between both hips by a dual-channel signal analyser. Twenty-seven healthy adults, 20 healthy pre-school children and 19 normal neonates were tested. Results from these three groups showed high coherence of the sound signals and that the discrepancy between both hips was smallest in the frequency range of 200–315 Hz. For normal neonates, the sound signals maintained a high coherence (γ2>0.97) and small discrepancy (D
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Postprint version. Published in Medical Engineering & Physics, Volume 25, Issue 10, 2003, pages 811-816.
© Medical Engineering & Physics 2003, IPEM. Published by Elsevier Ltd.
Kwong, K., Huang, X., Cheng, J., & Evans, J. (2003). Acoustic Transmission in Normal Human Hips: Structural Testing of Joint Symmetry. Medical Engineering & Physics, 25(10), 811–816. https://doi.org/10.1016/S1350-4533(03)00113-9