We developed a new ultrasonic evaluation system for articular cartilage using the maximum magnitude (MM) from ultrasonic analysis.
Maximum magnitude values were taken from unfiltered magnitude maps.
Correlations were observed between the maximum magnitude and the proteoglycan content from biochemical findings, and the maximum magnitude and the aggregate modulus from biomechanical findings.
To gain in-depth insights into the fundamental role played by compressive strain, we show in Figure 6, right, Δμ magnitudes, which derive from the maximum magnitude of the Δμ signals displayed in Figure 3, as a function of the bulk RPt Pt or the strain.
From a biomechanical point of view, the maximum magnitude was related to the aggregate modulus from the mechanical properties of the articular cartilage.
From an acoustic point of view, the maximum magnitude is a modification of the echo reflection from the cartilage surface, and hence differences in the surface reflection indicate significant alterations in the acoustic impedance among degenerated cartilage samples.
According to this study, the maximum magnitude was shown to reflect the proteoglycan content from biochemical analysis, the aggregate modulus from biomechanical analysis and the decrease in Safranin-O staining of the cartilage surface from histological analysis.
For comparison, the absolute maximum estimate Mmax-GEV = 9.57 ± 0.86 has a scatter more than twice that of the 90% quantile Q0.90,gev(10) of the maximum magnitude over the next 10 years beginning from 2007.
It takes about 24 hours for the star to go from its minimum to maximum magnitude.
