The easiest way to think of hyaluronic acid injections is that they help replace the joint's natural fluid, which is otherwise lost in osteoarthritis. Hyaluronic acid injections don't "cure" osteoarthritis. It is sort of like changing the oil in your car. Or, another way to think of hyaluronic acid injections is that they pave the pot-holes in the joint.

When hyaluronic acid injections are effective, the pain reduction typically lasts for six months to a year. If the pain recurs, the...