why does my knee hurt when i bend it

Being active is one of the best things you can do for your joints and the rest of your body. But injuries can happen, and they often involve the knees. Some of the most common problems are sprained ligaments, meniscus tears, tendinitis, and runner's knee. If you have an old knee injury that wasnБt properly treated, it may flare up now and then or hurt all the time. Several other things can also cause knee pain, such as:
Bursitis: A bursa is a sac that holds a small amount of fluid thatБs under the skin above your joint. It helps prevent friction when the joint moves. Overuse, falls, or repeated bending and kneeling can irritate the bursa on top of your kneecap. That leads to pain and swelling. Doctors call this prepatellar bursitis. You may also hear it called ''preacher's knee. " Dislocated kneecap: This means that your kneecap slides out of position, causing knee pain and swelling. Your doctor may call this Бpatellar dislocation. Б IT (iliotibial) band syndrome: The iliotibial (IT) band is a piece of tough tissue that runs from your hip down to the outer part of your knee. When you overdo activity, it can become inflamed over time. That causes pain on the outer side of the knee. ItБs common among runners when going downhill. Meniscal tear: Sometimes, a knee injury can cause cartilage to rip. These rough edges can get stuck in the joint, which causes pain and swelling. Many times, people will have the sensation of БcatchingБ in the joint when they are active.


Osgood-Schlatter disease: This condition happens when youБre young, when bones and other parts of the knee are still changing. It can cause a painful bump below the knee, where a tendon from the kneecap connects to the shin. Overdoing exercise, and irritation at a point on the bottom of your knee called the tibial tubercle, often make this area hurt. The ache may come and go over time. It's especially common in teenage boys and girls. Osteoarthritis: This is the Бwear and tearБ type of arthritis. ItБs a top cause of knee pain after age 50. This condition causes the knee joint to ache or swell when youБre active. Joints affected by osteoarthritis can also be stiff early in the day. Patellar tendinitis: This means you have inflammation in the tendon that connects the kneecap to the shinbone. Tendons are tough bands of tissue that connect muscles to your bones. When you overdo exercise, they can become inflamed and sore. You may also hear it called БjumperБs kneeБ because repetitive jumping is the most common cause. Patellofemoral pain syndrome: Muscle imbalance, tightness, and alignment problems of the legs usually cause this condition. It causes knee pain and occasional Бbuckling,Б meaning your knee suddenly canБt bear your weight. ItБs not due to an injury. It's more common for women than for men. Knee pain when bending is a common problem.


Forces up to seven times body weight can go through the knee as it bends, so it comes as no surprise that it is such a widespread problem. The pain may start suddenly after an injury, or gradually come on over time depending on the cause. There are a number of different causes of knee pain when bending, but they are generally all result from a problem with one (or more) of the structures in or around the knee affecting how it moves. This changes how the forces travel through the different parts of the knee and can result in too much pressure going through certain parts, which causes pain. Here we will start by looking at what is going on in the knee as it moves, different types of pain when bending, the most common causes of knee pain when bending and treatment options. The knee is a hinge joint, which means its main movement is bending and straightening (aka flexion and extension). As the knee moves, a number of things are happening: 1) They work in pairs with one relaxing and the other contracting (tightening) to allow the movement e. g. to bend your knee you hamstrings contract and you quads relax These structures all need to work together properly to allow for smooth, pain-free movement. Problems in any of these areas can lead to knee pain when bending. For example, if there is muscle weakness or ligament instability, the bones may move slightly out of position causing them to catch or grind on other structures in the knee.


This should come as no surprise when we realise how large the forces going through different parts of the knee. For example, when bending the knee to climb stairs, a force approximately three times body weight goes through the knee. When squatting down the force is even greater at seven times body weight and when jumping, a huge force ten times body weight goes through part of the knee. So letБs look at the most common causes of knee pain when bending. The is a special, extra thick layer of cartilage that lines the knee joint to provide cushioning and protection to the knee. It also helps to transmit the forces through the knee correctly. Meniscus tears are a common cause of knee pain when bending. Arthritis means Бinflammation of a jointБ and affects millions of people worldwide. There are over 200 different types of arthritis, but the one that most commonly causes knee pain when bending is osteoarthritis The best treatment will depend on the under lying cause of your knee pain when bending. You will find loads more information on the different conditions we have looked at including loads of great treatment advice by using the links above. Here we have looked at the most common causes of knee pain when bending, but almost any problem with the knee can result in pain as you move it. If none of these is sounding quite right, visit the section for more help work out what is wrong with your knee.

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