What is the reason for joint claps or pops or snap .. when u suddenly move the joint there is popping sound what is called and what the reason for it
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joint popping sound when moving suddenly called crepitus causes cavitation gas bubbles synovial fluid tendon snapping normal vs concerning signs
Bailey and Love's Short Practice of Surgery 28th Edition
Page 511
GradeResponse
The sound is commonly called joint cracking/popping, and medically it is often called crepitus (especially if it is repetitive or grating).
Most sudden, painless pops are due to one of these:
-
Cavitation (gas bubble release)
Small gas bubbles in synovial fluid form/collapse when pressure changes in the joint, causing a pop.
This is the common “knuckle crack” type sound and is usually harmless. -
Tendon or ligament snapping over bone
A tendon can move across a bony prominence and make a snap/pop.
Example: snapping hip is often from iliotibial band or psoas tendon moving over bone (Bailey & Love, p. 511). -
Rough joint surfaces
In arthritis or cartilage wear, the sound may be more grinding/crunching (pathologic crepitus).
Usually normal if:
- No pain
- No swelling
- No locking/giving way
- Full normal movement
Get checked if:
- Pain with popping
- Swelling, warmth, or stiffness
- Joint locks/catches
- Recent injury
- Sound is new and worsening
So in short: the name is usually crepitus/joint popping, and the most common reason is gas bubble cavitation or tendon snapping, often benign when painless.
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