With hypermobility, ligamentous laxity can produce tight, achy muscles and may lead to early onset of arthritis. Instability, on the other hand, can be a serious, even life-threatening condition. It usually results from significant trauma or from certain diseases like rheumatoid arthritis (not the degenerative type of arthritis otherwise referred to on this page). In clinical instability, the excessive motion of the vertebrae can cause pressure on nerves and the spinal cord leading to serious neurological problems. Hypermobility is not clinical instability. Furthermore, a person with a hypermobile spine does not usually go on to develop clinical instability.
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