A dose of corticosteroid (a type of cortisone) may be injected into the joint space to provide a long-lasting, anti-inflammatory effect.
A thick gel called hyaluronan (aka hyaluronic acid or hyaluronate) may be injected into the joint space to serve as a shock-absorber.
An inflamed joint is tapped to drain excess fluid relieving pain and pressure.
Needle aspiration is easily performed during an office visit.
A diagnosis of osteoarthritis is usually confirmed by x-ray before planning a joint injection.
Viscoelastic supplementation can help restore proper biomechanics of the knee. A viscous gel is injected to lubricate joints and to offset the effects of cartilage wear.
Hyaluronan can be expediently administered in a single injection.
Hyaluronan can be administered in series of injections for a cumulative cushioning effect.
Functional improvements in walking, running, standing, and stair climbing are most noticeable after the initial 2 weeks, but it may take up to 4 or 6 weeks to feel the full benefits.
The therapeutic effects of reduced pain, ease of movement, and enhanced performance in sports and exercise tolerance usually last for at least 6 months on average, and sometimes even longer.
Hyaluronan injections may serve to postpone or even to prevent the need for future joint replacement surgery.
