Biking, Walking Best for New Knees - Medline Plus

The thousands of Americans who undergo knee replacement surgeries each year may want to put away their tennis rackets and get back on their bikes, a new study shows.

An estimated 478,000 total knee replacement surgeries, called total knee arthoplasties (TKAs), are done in the United States each year, according to the researchers. In the surgery, the original joint is replaced by one made of various materials, such as plastic and metal.

Surgeons typically advise patients to resume physical activity when they are able. But advice about which activity is best has been subjective, D'Lima said. So, his team decided to measure forces on the knee while patients took part in a variety of exercises...