I had knee surgery in 2015 and sometimes and only thing that helps is sitting on the corner of my hot tub and letting the jets full on in my hot tub hit my knee. Of course my husband supports me.
Other times ice helps.
When your up to it you should go and give a wet tests on Bullfrog, hot springs, Jacuzzi, sundance and Marquee...
For RA both Ice and Heat or Heat and Ice combo punch works good...I really love the lounger, others hate it...