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Understanding Knee Cracking: Causes and When to Seek Medical Attention


Like a lot of other people, you might hear your knees pop when you stand up. While these sounds can be concerning, orthopedic experts provide insights into what causes them and when to seek medical treatment.

Cracking, clicking, or popping knees are common, especially as we age. Several factors can contribute to these sounds, including cavitation. 

Another cause can be how the kneecap tracks on the end of the thigh bone. As the kneecap moves, it may encounter a ridge or bump within the cartilage, causing a snap. This is usually normal and not a cause for concern.

When to Be Concerned


While occasional knee cracking is normal, certain symptoms accompanying the sound can indicate more serious issues. If the snapping, crackling, or popping is accompanied by pain, swelling, joint instability, a sensation of something moving inside the knee, or the knees locking up, it’s time to consult a doctor. These symptoms could indicate various conditions, including:

  • Meniscus Tears: Damage to the cartilage that cushions the knee joint.
  • Cartilage Damage: Deterioration of the cartilage lining the knee joint.
  • Arthritis: Inflammation and degeneration of the joint.
  • Thickened Tissue from Injury: Scar tissue or other changes following an injury.
  • Avascular Necrosis: A rare condition where the blood supply to the bone is compromised, leading to bone death and joint collapse.
  • Crepitus: This occurs when cartilage wears down, causing bone surfaces to grind against each other. It can be loud and sometimes felt through the skin, indicating arthritis.

Osteoarthritis is the most common form of arthritis, caused by wear and tear on the protective cartilage on the ends of bones. Dr. Wiznia compares it to the deterioration of tire tread. This condition can lead to crepitus and is more common as we age.

However, not all arthritis is painful or requires surgery. Nonoperative treatments include nonsteroidal anti-inflammatory medications, physical therapy, and injection therapy.

The Role of Exercise

male exercising from home concentrating while squatting with a dumbbell

Cracking and popping tend to occur when rising from low positions, as this movement stresses the kneecap. This stress can be exacerbated by a lack of strength to maintain proper form. Dr. Constance Chu, a professor of orthopedic surgery at Stanford University, emphasizes the importance of strengthening the body and improving movement patterns, even if some arthritis is present.

Research indicates that regular exercise, such as cycling, can prevent and improve symptoms of osteoarthritis. Physical activity helps maintain knee health and function, which is crucial for overall mobility and well-being, especially as we age.

While knee cracking can be unsettling, it’s often harmless. However, if accompanied by pain, swelling, or instability, it’s essential to seek medical advice. Strengthening the knees through exercise and proper movement can help prevent and manage symptoms of arthritis, supporting long-term mobility and health.

Have you experienced knee cracking? What steps have you taken to manage it? Share your experiences and thoughts in the comments below! Your insights could help others understand how to maintain knee health and when to seek medical attention.

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