My sister-in-law has had both knee joints and a hip replaced, albeit at different times. Order was knee, hip, knee. She’s on a waiting list for her other hip, has been since before the start of COVID. She’s now well into her 80s, uses a walking stick when walking on hard surfaces outdoors, but still manages to do some of her own housework, plus potters about in her garden for hours. She found, prior to each surgery, that painkillers (can’t remember what, but it wasn’t Paracetamol) and daily physio helped and still does to relieve the pain.