"I recommend to my patients to return to what [they] love to do," he said. However, he advises obese patients to consider weight loss.
Study author Lombardi said it's rewarding to follow up with patients after their surgery.
"To see these patients with crippling arthritis in the knee be able to walk and move again -- it's amazing," he said. "We can restore them back to a very active and pain-free lifestyle."
Data and conclusions presented at meetings are typically considered preliminary until published in a peer-reviewed medical journal.
The American Academy of Orthopaedic Surgeons has more about knee replacement.
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