What causes pain when bending the knee

Some middle-aged friends may have a question, that is, they feel pain when bending their knees. This symptom can be divided into several reasons. It may be bone hyperplasia, calcium deficiency, or degenerative changes in the knee joint. It is recommended to go to a regular hospital for examination and diagnosis of the specific cause.

1. Osteophyte

Also known as proliferative osteoarthritis, osteoarthritis (OA), degenerative joint disease, senile arthritis, and hypertrophic arthritis, it is a disease caused by the degeneration and degradation of soft tissues such as cartilage, intervertebral discs, ligaments, etc. that constitute the joints, the formation of bone spurs on the edges of the joints, synovial hypertrophy, etc., resulting in bone destruction, secondary bone hyperplasia, leading to joint deformation, and when subjected to abnormal loads, causing symptoms such as joint pain and limited movement.

2. Degenerative Disease of the Knee Joint

Also known as osteoarthritis of the knee, this is a strain disease of the knee joint. The root cause is the degeneration of the knee joint function, or simply a decline in function. Since the knee joint is the largest and most complex joint in the human body, the articular surface relies on the synovial fluid in the joint for lubrication and nutrition to keep the joint able to move freely. Therefore, the degeneration of the knee joint first causes the degeneration and wear of the articular cartilage, which leads to the inward shift of the force line when the lower limbs bear weight. Therefore, the cartilage on the inside of the joint wears more severely, which can cause symptoms such as knee pain, swelling, difficulty in flexion and extension, inability to squat, and increased pain when going up and down stairs.

3. Meniscus injury

Common clinical manifestations after meniscus injury include localized pain, joint swelling, snapping and locking, quadriceps atrophy, weak legs, and definite tenderness in the knee joint space or meniscus.