Also RA and OA. From surgery for left knee replacement, through physio (in rehab, then at-home, then 2x per week) took three months to complete recovery. Surgery for me also involved considerable bone rebuilding as so much erosion had occurred that replacement joint wouldn't fit. Ouch. Did involve pain at beginning, but physio went smoothly. No complications and no problems whatsoever in the 7 years since. Yeah!!