Hemorrhagic stroke and ischemic stroke risk is ~4% higher within 2 weeks of total hip replacement surgery. A hemorrhagic stroke is brought on by bleeding in the brain, while an ischemic stroke is brought on by arterial blockage. Total hip replacement is extremely common in the United States. Around 1 million hip replacement surgeries are done around the world every year, 300,000 in the United States alone.
Stroke, November 2012