Joint Cracking

Cavitation of Synovial Fluid

The most common type of cracking. When the joint capsule is stretched, pressure inside drops, dissolved gases (CO2, N2) form bubbles that burst with a characteristic click. Painless, not accompanied by swelling. The click can only be repeated after 15-20 minutes (time for gas to redissolve). A 2015 study (real-time MRI) confirmed: finger cracking does not cause osteoarthritis.

Snapping of Ligaments and Tendons

Tendon snapping over a bony prominence. Typical for hip ("snapping hip" — iliotibial tract over greater trochanter), shoulder (long head of biceps), knee (synovial plica). Painless in normal cases.

Hypermobility

In people with increased ligament elasticity (up to 15% of population), joints crack more often. Related to collagen characteristics. If no pain or instability — no treatment required.

Crepitus in Osteoarthritis

Coarse grinding felt by hand on the joint during movement. Cause — friction of damaged cartilage surfaces and exposed bone. Characteristic of Knee Osteoarthritis (Gonarthrosis), Hip Osteoarthritis (Coxarthrosis), shoulder osteoarthritis. Accompanied by pain, morning stiffness, limited motion.

→ Knee Osteoarthritis Treatment

Cracking in Chondromalacia Patellae

Grinding and crepitus when bending the knee — especially when climbing stairs, squatting. Cartilage on the posterior surface of the patella softens and breaks down. More common in young women and athletes.

→ Chondromalacia Treatment

Clicks with Meniscus Tear

Mechanical clicks and knee locking during movement. Damaged meniscus fragment gets caught between joint surfaces. Pain on squatting, inability to fully extend the leg.

→ Meniscus Treatment

Neck Cracking with Pain

Osteoarthritis of facet and uncovertebral joints of the cervical spine. Cracking on head turns and tilts with pain and limitation. X-ray shows osteophytes, narrowed joint spaces.

→ Facet Joint Syndrome Treatment

Shoulder Clicks

With labrum damage (Labral Tear), SLAP injury, instability. Click in certain arm positions. With impingement — painful arc with crepitus.

→ Shoulder Instability Treatment

Hip Joint Cracking

"Snapping hip" (coxa saltans): external (ITB), internal (iliopsoas muscle), intra-articular (labrum damage, loose bodies). If painless — observation. With pain — MRI.