Non-surgical outcomes among older adults after total joint replacement.

This study is looking at what happens to older adults' memory, mood, and quality of life after they have a hip or knee replacement. While joint replacement surgery is very common and generally very successful at reducing pain, some patients notice changes in their thinking or emotional wellbeing afterwards. Researchers want to understand how often this happens, what predicts it, and how well the brain's natural reserve can protect against these effects. You may be eligible if: - You are 50 years of age or older - You are having your first (primary) total hip or knee replacement, OR you are a partner, close friend, or sibling of someone who is - You are proficient in English You may NOT be eligible if: - You are having revision surgery, partial replacement, or another type of joint surgery - You have a neurological condition likely to affect thinking (e.g. dementia, multiple sclerosis) - (For controls) You have had invasive surgery in the last 6 months or have surgery planned in the next 6 months Talk to your doctor about whether this trial might be right for you.