Knuckle Cracking Quiz

What did Dr. Donald Unger's study conclude about knuckle cracking and arthritis?

• It only affects the hand that is cracked.

• It causes arthritis in both hands.

• It has no effect on arthritis development.

• It strengthens the knuckles.

What actually causes the sound when you crack your knuckles?

• Bubbles popping in synovial fluid

• Muscles stretching

• Bones rubbing together

• Tendons snapping

What is synovial fluid?

• A type of bone

• Fluid that lubricates joints

• A muscle tissue

• A type of cartilage

How often can you safely crack your knuckles?

• Every 5 minutes

• Every 10 minutes

• Every hour

• Every 15 to 20 minutes

Why is moderation important when cracking knuckles?

• To prevent arthritis

• To keep the bones strong

• To allow gases to dissolve back into the joint fluid

• To avoid muscle strain