What do you mean by SOS, TI and OSI bone strength measurement? Is the bigger the better or the smaller the better? Are there any standard indicators?

The greater the speed of sound (SOS), hardness index (STI) and ultrasonic conduction velocity (SOS), the better. At present, there is no index standard, because the equipment has just been used in China, and there is no standard in this regard, but it is still very meaningful as a clinical application. At present, China has done a lot of related research on bone strength, and clinically it is considered that self-control measurement is of great significance. thank you