Good results, however, are in the eye of the patient, according to Luks.
"It doesn't matter if a physical therapist says someone can bend their knee so many degrees," said Luks. "I base success on when a patient walks into my office and says, 'Thank you -- I'm happy -- I can do the things I want to do.' That's success."
For more on knee replacements, visit the Patient Education Institute at the U.S. National Institutes of Health.
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