Brain fog after hip or knee replacement: how common and how long?
NCT ID NCT03147937
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This study follows 505 adults aged 50 and older who are having hip or knee replacement surgery. Researchers use a simple online card-game test to measure changes in memory, attention, and thinking before and up to 4.5 months after surgery. The goal is to find out how many people experience lasting cognitive decline and what factors might increase that risk.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- What this could lead to
- If successful, this could help identify who is at risk for long-term thinking problems after surgery and point toward ways to prevent them.
- What could go wrong
- This is an observational study, not a treatment trial. It measures changes but does not test any intervention, so it cannot directly improve outcomes.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Sunnybrook Health Sciences Centre
Toronto, Ontario, M4N 3M5, Canada
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