Hello doctor, My mom is 49 years old and is having weight around 79kg. She has both knees osteoarthritis. She is not able to walk freely and has immense pain on both knees as well as below knees calf muscle. While going on small stairs even 2,3 stairs, She is having problems and requiring support with both hands. She is taking shelcal xt, jointace c2+, thynorm 25. She is also wearing joint knee caps in both legs. Is there any cure to this apart from surgery ? She had also taken kenacort 1ml on her left knee 3 weeks back but she didn't even feel any relief after that.  She is having also very less bone density i.e. T score is -2.64. I was thinking of buying an air bike or exercise cycle for her with the thought it will help in the mobility of her knees joints and lubrication of joints. Please advise us. Thanks.