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The noise is usually caused by one of three things:
1. The cartilage in the knee has worn a bit or pieces have chipped off due to injury or wear. This creates an uneven surface, which creates a noise as the rough pieces pull over each other.
2. The sack that holds fluid around the knee becomes inflamed, tight, or develops scar tissue. This can be from use or injury.
3. The kneecap is not aligning correctly, and scrapes as it pulls into position when you bend the leg.
Two of these can be treated or improved, depending on severity, with a shot of cortisone into the knee. The other can be improved with special exercises to get the knee to pull into the correct position, a physical therapist or doctor will show you the exercises which will be customized depending on which way your kneecap is pulling.
All of these require a visit to a sports medicine doctor, and at minimum an x-ray, to rule out other causes that might cause noise but be more serious and need more aggressive treatment or surgery.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoA knee may make a crunching sound if the cartilage has worn away. Also, if you have inflammation around the knee, it may sound like crunching when bending the leg.
Wiki User
∙ 10y agoOnly a Doctor can tell you why YOUR knees do this. However, the sound is normally caused by roughening (or lack) of cartilage in the joint.
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