The knees are the most easily injured part of the body. The largest and most complicated joint, the knee is used for everything from standing up, sitting, to walking, running, etc. It's a weight-bearing joint that straightens, bends, twists and rotates. All this motion increases your risk of acute or overuse knee injuries.

Knee pain accounts for approximately one third of musculoskeletal problems seen in primary care settings. This complaint is most prevalent in physically active patients, with as many as 54 percent of athletes having some degree of knee pain each year.1 Knee pain can be a source of significant disability, restricting the ability to work or perform activities of daily living.

Knee pain is an extremely common complaint, and there are many causes. It is important to make an accurate diagnosis of the cause of your symptoms so that appropriate treatment can be directed at the cause. If you have knee pain, some common causes include:

Knee pain is commonly caused by doing too much too soon when you haven't exercised for a long period of time - especially high-impact aerobics; walking, running or jumping on hard surfaces or uneven ground; excessive running up and down stairs (When you walk upstairs you are putting pressure on your knees that is equivalent to four times your body weight, when running up the stairs it can be eight times your body weight).

Knee osteoarthritis is a common cause of knee pain. The risk increases with age. Osteoarthritis is a form of arthritis involving degeneration of the cartilage. Exercise is vital to maintain strength and flexibility of muscles supporting the knee, which reduces the stress on the knee joint.


Common Knee Symptoms

Popping

Popping and snapping within the knee is quite common, and often not a symptom of any particular problem. When the pops or snaps are painless, there is usually no problem--the bigger concern is when these sounds are associated with pain. A pop is often heard or felt when a ligament, such as the ACL, is torn.
Crunching/Grinding

A sense of grinding or crunching is most often associated with bone grinding against bone once the cartilage is worn away.
Knee arthritis typically affects patients over 50 years of age. It is more common in patients who are overweight, and weight loss tends to reduce the symptoms associated with knee arthritis. There is also a genetic predisposition to this condition, meaning knee arthritis tends to run in families.

Possible Complications of Surgery

Serious complications may occur with any surgical procedure. These include but are not limited to: problems with anesthesia, cardiovascular problems including heart attack, vascular problems including thrombus, bronchopulmonary problems including emboli, genitourinary problems, and gastrointestinal problems. Certain additional complications related to joint replacement surgery in particular may include but are not limited to: bleeding problems, blood clots in the legs and/or lungs, wound healing problems, damage to nerves and blood vessels, limb length discrepancy, bone erosion or abnormal bone formation.

Complications may require medical intervention including additional surgery and, in rare instances, may lead to death. Your doctor should discuss these potential complications with you.

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