Degenerative Joint Disease: Stages and Options

Degenerative joint disease is the clinical name for osteoarthritis: the gradual loss of the cartilage that covers the ends of bones inside a joint. It is the reason most hip and knee replacements are performed, and the reason most of them could have been scheduled a year earlier or a year later without anything dramatic changing.

Understanding where you are on that curve is what makes the decision rational instead of anxious.

What is actually happening

Articular cartilage is a smooth, slippery surface a few millimetres thick. It has no blood supply and no nerve endings, and it does not regenerate meaningfully once damaged.

As it thins:

• The joint space on an X-ray narrows — that gap is the cartilage
• The bone underneath thickens and responds by growing spurs at the margins
• The lining of the joint becomes inflamed and produces extra fluid
• Eventually bone contacts bone, which is where the pain becomes constant

The cartilage itself has no nerves. The pain comes from the bone, the lining and the surrounding structures reacting to the loss of it.

The stages, and what each one means for you

Early

On the X-ray: minimal narrowing, perhaps a small spur. What you feel: stiffness after sitting, an ache after unusual activity, nothing on an ordinary day. What helps: this is the stage where strengthening, weight management and activity adjustment do most of their work. Nothing here calls for surgery.

Moderate

On the X-ray: definite narrowing, spurs at the margins. What you feel: pain with most walking, stiffness in the morning that eases in half an hour, difficulty with stairs. What helps: continued strengthening, anti-inflammatories used sensibly, injections. A good programme at this stage can hold the line for years.

Advanced

On the X-ray: severe narrowing, bone changes beneath the surface. What you feel: pain most days, walking distance noticeably reduced, sleep sometimes disturbed. What helps: the same measures, giving progressively less relief for shorter periods. This is where replacement enters the conversation.

End-stage

On the X-ray: bone on bone, no joint space left. What you feel: pain at rest and at night, your day planned around the joint, a limp you cannot correct. What helps: joint replacement is the treatment that resolves this. Nothing else restores the surface.

A caution worth keeping: X-ray stage and symptoms correlate imperfectly. People with bone-on-bone films sometimes walk comfortably, and people with moderate films sometimes suffer badly. The film informs; your function decides.

What works before surgery, and what does not

Worth doing:

• Strengthening the muscles around the joint. The most consistently effective non-surgical measure there is.
• Weight management. Each kilogram lost removes several times that in load across the knee with every step.
• Activity substitution. Cycling and swimming maintain fitness without the impact.
• Anti-inflammatories, within the limits your doctor sets.
• Corticosteroid injections, for a flare — effective, temporary, not to be repeated indefinitely.

Worth being realistic about:

• Supplements. Widely used; the evidence is weak at best.
• Hyaluronic acid injections. Helpful for some patients, unimpressive in trials overall.
• Arthroscopy for arthritis. Tidying up an arthritic knee does not treat the arthritis, and in degenerative knees it generally does not help.

When replacement becomes the answer

Surgeons weigh a combination rather than any single item:

• Pain at rest and at night
• Function lost in ways you can name — stairs, shoes and socks, walking distance
• Imaging showing the joint surface is gone, ideally on weight-bearing films
• Conservative treatment exhausted, with injections giving less relief each time
• The balance tipped: the recovery from an operation now costs less than another year as you are

For the knee, that operation is total or partial knee replacement, US$ 11,500 all-inclusive. For the hip, total hip replacement, US$ 15,000. Both figures are fixed in writing before you travel, and every price we charge is on our price list.

What replacement does and does not do

It reliably removes arthritic pain and restores function. Most patients stand the day of surgery and walk with support within days.

It does not make a joint better than new, it does not fix pain coming from elsewhere — a hip problem blamed on the knee, a back problem blamed on the hip — and implants have a working life measured in decades rather than forever. Those are reasons to time the decision well, not reasons to avoid it.

Frequently asked questions

Is degenerative joint disease the same as osteoarthritis?

Yes. The two terms describe the same process of cartilage loss and the bone’s response to it.

Can cartilage grow back?

Not in any meaningful way in an adult joint. Treatment aims to reduce load, control inflammation and maintain the muscle that protects the joint — or, at the end, to resurface it.

Will exercise make it worse?

The right exercise makes it better. High-impact loading of an already painful joint is unhelpful; strengthening and low-impact conditioning are among the most effective treatments available.

How do I know it is time?

When pain is present at rest, when your day is organised around the joint, and when the treatments that used to work have stopped working. That combination, with imaging to match, is the threshold most surgeons use.

What to do next

If you are somewhere on this curve and unsure where, a weight-bearing X-ray and a conversation usually settle it. Send your imaging and a short description of what the joint stops you doing, and a surgeon will tell you what stage it is at and whether replacement is the right operation yet — in writing, before you commit to anything.