Knee pain is a common complaint that affects people of all ages. Knee pain may be the result of an injury, such as a ruptured ligament or torn cartilage. Medical conditions — including arthritis, gout and infections — also can cause knee pain.
Many types of minor knee pain respond well to self-care measures. Physical therapy and knee braces also can help relieve pain. In some cases, however, your knee may require surgical repair.
The location and severity of knee pain may vary, depending on the cause of the problem. Signs and symptoms that sometimes accompany knee pain include:
- Swelling and stiffness
- Redness and warmth to the touch
- Weakness or instability
- Popping or crunching noises
- Inability to fully straighten the knee
Knee pain can be caused by injuries, mechanical problems, types of arthritis and other problems.
A knee injury can affect any of the ligaments, tendons or fluid-filled sacs (bursae) that surround your knee joint as well as the bones, cartilage and ligaments that form the joint itself. Some of the more common knee injuries include:
- ACL injury.
- Torn meniscus
- Knee bursitis
- Patellar tendinitis
Some examples of mechanical problems that can cause knee pain include:
- Loose body
- Iliotibial band syndrome
- Dislocated kneecap
- Hip or foot pain
Types of arthritis
Although it’s not always possible to prevent knee pain, the following suggestions may help ward off injuries and joint deterioration:
- Keep extra pounds off. Maintain a healthy weight; it’s one of the best things you can do for your knees. Every extra pound puts additional strain on your joints, increasing the risk of injuries and osteoarthritis.
- Be in shape to play your sport. To prepare your muscles for the demands of sports participation, take time for conditioning.
- Practice perfectly. Make sure the technique and movement patterns you use in your sports or activity are the best they can be. Lessons from a professional can be very helpful.
- Get strong, stay flexible. Weak muscles are a leading cause of knee injuries. You’ll benefit from building up your quadriceps and hamstrings, the muscles on the front and back of your thighs that help support your knees. Balance and stability training helps the muscles around your knees work together more effectively.
And because tight muscles also can contribute to injury, stretching is important. Try to include flexibility exercises in your workouts.
- Be smart about exercise. If you have osteoarthritis, chronic knee pain or recurring injuries, you may need to change the way you exercise. Consider switching to swimming, water aerobics or other low-impact activities — at least for a few days a week. Sometimes simply limiting high-impact activities will provide relief.
When to see a doctor
Call your doctor if you:
- Can’t bear weight on your knee or feel as if your knee is unstable or gives out
- Have marked knee swelling
- Are unable to fully extend or flex your knee
- See an obvious deformity in your leg or knee
- Have a fever, in addition to redness, pain and swelling in your knee
- Have severe knee pain that is associated with an injury
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