I broke my back after a fall back in January(I just started riding again last month) and here's what I did with my horse do I could still spend time with him...
-groom or bathe him
-take him on walks outside
-I would grab a lunch or a snack or a book/homework and I would just sit on a chair by my horses stall while I eat or did my work, I think he liked just having me near him
-I also taught my horse acouple few tricks and did some bonding exercises/Liberty stuff