Rheumatoid Arthritis & Joint Replacement — A Different Kind of Arthritis

How rheumatoid arthritis differs from osteoarthritis

Most patients who come to me for joint replacement have osteoarthritis — the mechanical wear and tear of cartilage over time. Rheumatoid arthritis (RA) is a fundamentally different condition, and understanding the difference matters enormously for how we approach treatment.

Osteoarthritis is a mechanical problem. Rheumatoid arthritis is an immune problem. In RA, the body's own immune system attacks the lining of the joint — the synovium — causing chronic inflammation that gradually destroys cartilage, bone, and soft tissue. This inflammation can affect multiple joints simultaneously, often in a symmetrical pattern — both knees, both wrists, both shoulders.

The destruction in RA can be rapid and severe, often affecting patients at a much younger age than osteoarthritis. And because the underlying disease is systemic, joint replacement in an RA patient requires a very different level of planning and coordination than in a standard osteoarthritis patient.

When does rheumatoid arthritis require joint replacement?

Not all RA patients will need joint replacement. Modern disease-modifying drugs (DMARDs) and biologic medications have transformed the management of RA and can significantly slow joint destruction when started early.

Joint replacement becomes necessary when:

• Joint destruction has progressed despite medical management.
• Pain is severe and constant despite optimal rheumatological treatment.
• Function is significantly impaired — the patient cannot perform basic daily activities.
• X-rays show advanced joint space loss and structural damage.

The decision to proceed with surgery is always made in close coordination with the patient's rheumatologist, who manages the underlying disease and advises on the safe management of RA medications around the time of surgery.

Why joint replacement in RA patients is more complex

In my experience, rheumatoid arthritis patients require more careful overall planning than standard osteoarthritis patients. The reasons are multiple and all significant:

Poorer bone quality

Chronic inflammation and long-term steroid use — common in RA management — reduce bone density. This makes implant fixation more technically demanding and increases the risk of bone-related complications during and after surgery.

Higher infection risk

Many RA patients take immunosuppressant medications — DMARDs, biologics, and steroids — that reduce the immune system's ability to fight infection. Infection is one of the most serious complications of joint replacement, and in immunosuppressed patients, the risk is meaningfully higher. Careful pre-operative planning, antibiotic protocols, and coordination on medication timing are all essential.

More severe deformity

RA can cause significant joint deformity — valgus deformity of the knee, severe bone erosion, and soft tissue contractures that would not be present in a typical osteoarthritis case. Correcting these deformities during surgery requires a higher level of surgical experience and sometimes specialised implants.

Multiple joint involvement

RA patients may need joint replacement in more than one joint — and the sequence in which joints are replaced matters. Replacing a knee when the hip on the same side is severely affected may not provide the expected relief, because the patient cannot fully load the new knee with a painful hip above it. Surgical planning in RA must consider the whole patient, not just the individual joint.

Managing RA medications around surgery

This is one of the most important conversations I have with RA patients before surgery. Several RA medications need to be adjusted or temporarily stopped before joint replacement to reduce infection risk — but stopping them too early can cause a disease flare that worsens the joint and the patient's overall condition.

The timing of medication changes is managed in close coordination with the rheumatologist. Biologics are typically stopped one dosing cycle before surgery. Methotrexate may be continued or stopped depending on the individual patient's situation. Steroids require careful management to avoid adrenal crisis around the time of anaesthesia.

This coordination is non-negotiable. It is one of the reasons that RA joint replacement should be performed by a surgeon with specific experience in this patient population.

Outcomes of joint replacement in rheumatoid arthritis

When performed correctly in the right patient at the right time, joint replacement for rheumatoid arthritis delivers excellent outcomes. Pain relief is often dramatic — particularly because RA patients frequently have very high levels of pain before surgery.

Recovery requires patience. RA patients may take longer to rehabilitate than osteoarthritis patients, partly because of muscle weakness from chronic disease and partly because of the more complex surgery that may have been required. But the functional gains are real and meaningful.

Many of my RA patients describe joint replacement as the single most significant improvement in their quality of life — more so than any medication they have taken.

Consulting for joint replacement with rheumatoid arthritis

If you have rheumatoid arthritis and are considering joint replacement, bring your rheumatologist's latest clinic letter and a complete list of your current medications to the consultation. The assessment will include a review of your X-rays, your current disease activity, your medication history, and your overall fitness for surgery.

Frequently Asked Questions