Why do I experience knee pain when bending?

Pain when bending the knee is a common problem, and the vast majority of middle-aged and elderly people have experienced this unpleasant experience. Knee pain when bending should not be ignored as it may be a precursor to various physical conditions. Meniscal injury, knee bursitis, cruciate ligament injury, rheumatoid arthritis, etc. can all cause patients to feel pain when bending their knees. In order to obtain an accurate diagnosis when seeking medical attention, you should actively pay attention to the symptoms and manifestations of knee pain when bending.

Why do I experience knee pain when bending

1. The causes of knee pain when bending

Diseases such as osteoarthritis, meniscus tear, knee bursitis, ligament injury, and tendonitis can cause pain when bending the knee. Excessive knee use or heavy physical labor can also lead to knee pain. Here are some common symptoms of knee pain when bending.

Patellofemoral syndrome refers to the pain caused by abnormal joint surfaces between the patella and femur, resulting in abnormal patellar trajectory and increased friction during movement. Patellar pain syndrome is mainly characterized by anterior knee joint pain, which can be located above, below, or around the patella. When patients go up and down stairs, squat or kneel, sit for a long time, or run, the pain will be more pronounced.

Iliotibial tract syndrome (ITBS) is a disease that causes lateral knee pain. It is caused by inflammation of the iliotibial tract (ITB), a tough fascial band that extends from the pelvis to the knee.
Long distance running enthusiasts and cycling enthusiasts are a high-risk group for iliotibial tract syndrome. This type of group will involve a large amount of knee flexion and extension movements during exercise, which can cause symptoms such as swelling and pain on the lateral side of the knee joint and stiffness of the knee joint.

Patellar tendinitis is a tendon disease that affects the connection between the patella and tibia. The function of the patellar tendon is to assist muscle activity during calf movements. The characteristic of patellar tendinitis is persistent pain and inflammation, leading to weakened tendons and a tearing sensation. The most common cause of patellar tendinitis is overuse, especially in sports involving excessive jumping and running. Patellar tendinitis usually causes swelling, stiffness, and persistent fever and pain below the patella.

The meniscus is located between the femur and tibia, helping to cushion the joint and stabilize it. Meniscal tear refers to the tearing of the C-shaped cartilage in the knee joint. Meniscal tear may be caused by sudden knee torsion or direct pressure applied to the knee. The middle-aged and elderly population is a high-risk group for meniscus tear due to their degenerative weakness.

Osteoarthritis is a chronic disease that affects the cartilage of joints. Cartilage is a smooth and elastic tissue that helps bones move smoothly during movement. Osteoarthritis can lead to cartilage wear, causing pain, stiffness, and swelling when you bend or squat. Osteoarthritis is the most common joint disease that affects any joint in the body, particularly in areas such as the knee, buttocks, fingers, and spine.

Beck’s cyst is a fluid filled cyst located in the popliteal fossa behind the knee. It is also known as a popliteal cyst. Beck’s cyst is usually caused by increased pressure within the knee joint, such as due to arthritis or meniscus tear. Shell cysts can cause swelling, pain, stiffness, and reduced range of motion in the posterior part of the knee.

2. How to prevent knee pain during bending?

3. When do I need to see a doctor for knee pain

Not all knee pain requires immediate medical assistance. The vast majority of mild knee pain problems can be addressed through self-regulation. Common minor sprains or impact pain can be treated urgently with ice compress. Apply ice for 6-8 hours before using hot compress to accelerate blood flow in the painful area of the knee and promote self repair of knee damage.

If your knee pain persists for a long time, or if you experience severe pain when bending your knee, then you should seek medical treatment immediately. Persistent fever and redness in the knee area are clear signals of inflammation in the area, which cannot self repair in the short term and requires medication treatment.

It is particularly important to accurately describe the pain area and sensation of the knee when you go to a medical institution. This can allow your supervising doctor to accurately determine the type and severity of your pain and adopt the correct knee pain treatment plan. We suggest that you check the article — Knee Pain Location Chart: Understanding the Source and Location of Knee Pain.

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