Because it has had an additional load as a result of the weakness of the surrounding muscles, which are supposed to help the joint and ligaments bear part of the weight on them.

- Because you simply no longer use it as before, the muscle that is not used extensively, the body weakens and dismantles it, reducing the blood supply to it.

Or due to a lack of collagen production due to age, or due to a deficiency of vitamin D and magnesium, or due to a lack of vitamin C in the diet.

The best way to increase the blood supply to the joint and the surrounding muscles is to exercise, and to take sulfur in the form of methyl sulfite methane. More blood to the joint means more minerals and vitamins, more collagen protein, and more immune cells.

Therefore, when bodybuilders exercise without heating the muscle by delivering more blood to it, they are exposed to injuries.