I have not ridden since my TKR's since I no longer have horses. But I used to own horses and rode for 30 years til we all geriatric-ed out.
Assuming you have a normal recovery, I can't image any problems with recreational riding. You may need a mounting block for a taller horse until your leg gets back overall flexibility, depending on which side the surgery was on. Once on the horse though, there should be no difference in how you use your legs.