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If you've been complaining about knee pain, you're not alone. Millions of Americans are living with the nagging problem.

Seventy-year-old Marlene Haselbauer's right knee recently gave out and left her with pain and discomfort. It turned out to be arthritis, which ultimately led Haselbauer to have knee replacement surgery.

"Upwards of 90 to 100 million people a year in this country deal with some sort of form of arthritis and some sort of pain associated with arthritis, so by far it is the most common," orthopedic surgeon Dr. Jeff Geller said.

Knee problems can range from sprains and swelling to challenges as severe as arthritis where the cartilage in the knee joint wears out. Doctors say if you experience pain, swelling, or are limping for longer than a few weeks, get it examined.

"Listen to your body. If your knee starts to hurt, don't overdo it. Typically, keeping yourself active and keeping the muscles in the legs reasonably strong with some sort of light exercise really goes a long way to help protect the knees," Geller said.