What is the structure of movable joints?
A joint has many parts that work together to allow for movement without pain.
Our joints move because of tendons, ligaments, and muscles. Tendons connect one bone to another, while ligaments connect our muscles to our bones.
These connective tissues keep our joints stable as we move. Without them, our bones wouldn’t stay together, and we’d drop as a pile of bones on the floor.
In each movable or synovial joint, there’s cartilage and synovial fluid.
The cartilage is a specialized connective tissue that acts as a cushion and a shock absorber between bones to lessen the friction as they glide against each other for painless movement.
In addition, synovial fluid is an oily substance that lubricates the joints to reduce friction, allowing both ends of the bones to move against each other smoothly.
When you crack your knuckles or when your knees click when you walk, the sound you hear is from the bubbles in your synovial fluid popping. And by the way, we advise against knuckle cracking. It may lead to some damage in the long run.
Any problem occurring to these parts of a joint’s structure can lead to injury and pain.