Medical News
Creaky Knees? Don’t Just Sit There!
Knee problems are an unfortunate side effect of aging, as inevitable wear and tear causes deterioration. One option for relief is knee replacement surgery, although in many cases exercise can help you manage pain and delay or avoid surgery.
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The demand for knee replacements from those age 45 to 64 has tripled in the past 10 years to more than 254,000 in 2009, the latest year for which statistics are available (“Baby Boomers’ demand, expectations for new knees soar,” USA Today). This increase may be a result of the many baby boomers who have led active lives—skiing, hiking, running, bicycling—and want to stay fit into their older years. While many turn to knee replacement surgery, it often can be delayed or prevented by exercise.
Causes of Knee Problems
Unfortunately, aging is one of the risk factors for developing knee pain. The older we get, the more wear and tear we experience. As the largest joint in the body, one that bears much of the body’s weight when walking and running, the knee is vulnerable to deterioration. A lifetime of exercising and moving takes a toll on cartilage, made worse by the fact that older bodies don’t recover from injuries as quickly as they once did and that we tend to gain weight as we age.
A primary cause of knee pain in older adults is osteoarthritis, which occurs when articular cartilage breaks down around the knee. Cartilage acts as a cushion or shock absorber, and when this padding is lost, bones grind together, causing pain, bone spur formation and decreased motion. Cartilage degeneration can cause chronic joint inflammation, resulting in swelling or stiffness and a loss of flexibility. Over time, this inflammation can further break down cartilage, and if left untreated, cartilage may wear away completely.
Osteoarthritis, which can affect any of the body joints, is one of the five leading causes of disability among older men and women. The risk for disability from this form of arthritis is as great as that from cardiovascular disease (Aging Knee,” Lifebridge Health).
As we age, the ability of cartilage to heal itself decreases, and muscles, in general, may shrink in size by roughly 40 percent, which reduces strength. To compensate, we may put more pressure on muscles in the hips and legs, leaving us more vulnerable to knee pain.
Genetics and gender play a role too. After the age of 50, women are more likely to develop chronic knee pain than men, and the robustness of cartilage you inherited from your parents can mean the difference between more or less cartilage deterioration.
One of the biggest factors for developing osteoarthritis is weight, because the more you weigh, the greater load your knees have to bear. Shedding extra pounds can make a big difference. Every pound of body weight is equal to five extra pounds of force on your knees (“Hip and Knee Replacements on the Rise,” WebMd).
Researchers are investigating other risk factors, including the impact of vitamins C and D deficiency, poor posture or bone alignment, poor aerobic fitness and muscle weakness.
How Surgery Works
Knee replacement surgery is the most common type of joint replacement surgery. During the operation, the surgeon makes an 8- to 12-inch cut in front of the knee, removes the damaged part of the joint from the bones’ surfaces and shapes the surfaces to hold a metal or plastic artificial joint. The artificial joint is attached to the thigh bone, shin and knee cap, either with cement or a special material. When fit together, the attached artificial parts form the joint, relying on the surrounding muscles and ligaments for support and function (WebMD).
Those who get a knee joint replacement stay in the hospital, on average, three to five days and start experiencing dramatic improvement in the use of their knee one month or more after surgery, although most people aren’t walking on their own until six weeks after the surgery.
An emerging procedure, not yet widely used or researched, is minimally invasive surgery, which employs specialized techniques and instruments to enable the surgeon to perform major surgery without a large incision. The smaller incision, 3 to 5 inches, results in less tissue damage by allowing the surgeon to work between the fibers of the quadriceps muscles instead of cutting through the tendon. This method may lead to less pain, decreased recovery time and better motion due to less scar tissue formation.
A downside to knee replacement surgery is the lack of research to determine the implant’s longevity and whether another will be necessary. People are encouraged to talk with their physician about potential future complications.
In many cases, doctors encourage patients with knee problems to try other approaches first, including physical therapy, weight loss, range-of-motion exercises, stretches and devices that offer knee support. Doctors also advise switching to exercises easier on the knee, such as running on a treadmill instead of pavement, and to work out in moderation.
Best Types of Exercise
Knee experts recommend three types of exercise. While stretching helps maintain or increase flexibility and also relieve knee stiffness, strengthening workouts aid in preserving or improving muscle strength, which supports and protects arthritic joints. Aerobic or endurance exercises boost heart function, enhance blood circulation and help control weight. Some studies show that aerobic exercise can reduce swelling in some joints.
Good exercises for osteoarthritis are low-impact, including swimming. Stretching, such as with tai chi or yoga, before and after you exercise is also important.
One way to take pressure off the knees is to pay attention to and strengthen the muscles around the knees, which adds much-needed joint support. To develop surrounding muscles—particularly quadriceps and hamstrings—as well as core muscles—obliques, lower back, upper thigh—WebMD suggests knee extensions, hamstring curls, leg presses and flexibility exercises.
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