Normally, the bones, ligaments, and muscles of a joint work together to support the various parts of the joint in their correct positions while also allowing the full range of motion of the joint.
In joint instability, there is lack of support, with the result that the joint may not move correctly or may be dislocated easily.
In shoulder instability, for example, the shoulder joint feels abnormally loose, and there may also be symptoms such as tingling, numbness, or weakness in the arm. In extreme cases, the shoulder may dislocate.
Treatment may involve physical therapy and anti-inflammatory medication or surgery to stabilize or repair the joint. If the joint has dislocated, it will need to be manipulated back into position.

Othere related diseases

LIGAMENT SPRAINS
Ligaments are bands of tissue that hold bones together at a joint. They are not very stretchy and are prone to tearing, especially when subjected to sudden forc...

METATARSALGIA
Pain in the ball of the foot—metatarsalgia— is commonly due to excessive pressure on the ball of the foot from high-impact sports, poorly fitting footwear, ...

MUSCLE CRAMPS
Sudden muscle spasms in which a muscle or group of muscles becomes hard, painful, and tight often occur during physical exercise. Another common cause is sittin...

MUSCLE STRAINS AND TEARS
Muscle injuries range from a mild strain (sometimes referred to as pulling a muscle), in which the muscle fibers are overstretched, to a complete tear.
Str...

MYASTHENIA GRAVIS
In myasthenia gravis, the immune system attacks the receptors in muscles that receive nerve signals, resulting in muscle weakness.
The condition is sometim...

NERVOUS DISORDERS