What osteoarthritis is
Osteoarthritis involves the whole joint: the cartilage thins and its surface roughens, the underlying bone thickens and remodels, the joint lining becomes intermittently inflamed, and the muscles around the joint weaken. It is an active process, which is the important part — active processes can be influenced.
The most commonly affected joints are the knee, the hip, the base of the thumb, the small joints of the fingers, and the spine. Symptoms are typically gradual: stiffness that is worst for the first half hour of the morning, pain that comes on with use, and a joint that grumbles the day after activity it is not conditioned for.
Why the X-ray is not the answer
Radiographic arthritis and painful arthritis overlap far less than people expect. A great many people walk around with substantial joint space narrowing and no pain at all, and plenty of painful joints look unimpressive on film.
So the examination leads: what the joint’s range is, where it is tender, how it swells, what strength is available around it, and — most usefully — what you have stopped being able to do. Imaging answers specific questions and confirms the picture. It does not set the treatment plan by itself.
Treatment
Joint injections. Corticosteroid injections reduce inflammation and pain, and are genuinely useful. They are used here deliberately and with a purpose attached: the window of reduced pain is when the strengthening work becomes possible, and that is what makes the improvement outlast the injection.
PRP. Platelet-rich plasma, prepared from your own blood, aims to support the joint’s own repair environment rather than only suppress inflammation. The evidence is most encouraging in mild-to-moderate knee osteoarthritis and thinner in severe disease. You will be told honestly which group your joint is in and what that means for expected benefit.
Loading and strengthening. The least glamorous and most effective part. Muscle around a joint absorbs load the joint would otherwise take. Weight, where it is relevant, changes the forces across a knee or hip by a multiple of itself.
Activity modification that keeps you doing what matters to you, rather than a list of things to stop.
The approach here
Dr. D’Alessio is board-certified in Physical Medicine & Rehabilitation and was Chief Resident in PM&R at Mount Sinai Hospital. PM&R exists to restore function without operating, and that is the frame applied to arthritis: not “how do we numb this joint”, but “what has this joint stopped letting you do, and what gets that back”.
Where a joint is genuinely end-stage and a replacement is the right answer, you will be told that plainly.