Below are links to three discussions from this forum with info on vibrations platforms for osteoporosis, including the expensive Marodyne device, which has not received FDA clearance in the U.S. (Full disclosure: I do not own a vibration plate and currently do not plan to purchase one.)
1. https://connect.mayoclinic.org/discussion/has-anyone-used-the-marodyne-device-to-stimulate-bone-growth/ (I found the attachments in @rola's comment at https://connect.mayoclinic.org/comment/916741/ quite helpful)
2. https://connect.mayoclinic.org/discussion/does-anyone-have-info-re-maradyne-a-low-intensity-vibration/
3. https://connect.mayoclinic.org/discussion/whole-body-vibration-for-osteoporosis/