Many people with Rheumatism know: it rarely remains a pure inflammation of the joints. Often, over the years, a secondary osteoarthritis – i.e., joint wear caused by Rheumatoid Arthritis is triggered. The large joints such as hip and knee are particularly affected. This blog explains in detail how the disease develops, what symptoms are typical, and why in the final stage often only an endoprosthesis (hip replacement or knee replacement) helps.

What does secondary osteoarthritis mean in rheumatism?

Osteoarthritis refers to the wear of the articular cartilage. In primary osteoarthritis, age and overloading are the main factors. In secondary osteoarthritis, on the other hand, another underlying disease is present.

Rheumatoid Arthritis is a chronic inflammatory autoimmune disease that leads to the destruction of the synovial membrane, cartilage, and bone. The persistent inflammation results in severe joint damage over the years. This combination of inflammatory rheumatism and degenerative wear distinguishes secondary osteoarthritis from classical osteoarthritis.

How does osteoarthritis develop through Rheumatoid Arthritis?

Inflammation as a trigger

The synovial membrane is permanently inflamed and releases enzymes that break down cartilage tissue.

Bone damage and erosions

In rheumatism, the bone edges are literally "eaten away". As a result, the joint loses stability.

Malalignment and instability

Damaged ligaments and bones lead to varus or valgus malalignment, which puts additional stress on the cartilage.

Combination of inflammation and wear

Typically, patients experience both inflammatory pain and osteoarthritis pain – a particularly burdensome combination.

Hip joint - secondary osteoarthritis in rheumatism

Symptoms

• Groin pain that can radiate to the leg
• Resting pain and load-bearing pain
• Limited mobility, especially internal rotation
• Progressive leg length discrepancy

Consequences

Hip osteoarthritis in Rheumatoid Arthritis often progresses faster than in primary osteoarthritis. Those affected lose their mobility early and require assistive devices.

Knee joint - secondary osteoarthritis in rheumatism

Symptoms

• Pain when walking, standing up or climbing stairs
• Recurring swelling due to synovitis
• Axial deviations (X- or O-legs)
• Significant movement restrictions

Special feature

In the knee , malalignments are often pronounced, making surgical treatment more difficult.

When is an endoprosthesis (hip replacement, knee replacement) necessary?

When conservative therapies such as physiotherapy, medication or injections are no longer sufficient, it is referred to as the end stage of osteoarthritis. Typical signs are:

• Persistent pain, even at rest
• Massive limitation in everyday life
• Radiologically detectable joint destruction
• Malalignment and instability

In this phase, only an artificial joint (hip replacement or knee replacement) helps.

Special features in surgeries of rheumatic patients

Patients with rheumatoid arthritis are different from arthrosis patients without rheumatism:

• Bone quality: Often osteoporosis → decision for cemented prostheses
• Soft tissues: Weakened capsule and ligaments require special surgical techniques
• Medications: Immunosuppressants increase the risk of infection → close coordination with rheumatology
• Complication risks: Wound healing disorders and infections are more common than in primary arthrosis

Results after hip and knee replacement in rheumatism

Despite the challenges, studies show:

• Pain decreases significantly after a prosthesis
• Mobility and quality of life improve
• Risks are slightly increased, but can be minimized in specialized centers

Post-treatment and rehabilitation

The rehabilitation after an endoprosthesis needs to be individually adjusted for rheumatism:

• Early mobilization to prevent muscle atrophy
• Adapted training due to multi-joint involvement
• Close rheumatological monitoring
• Special wound checks due to increased risk of infection

Why specialized centers are important

Patients with secondary osteoarthritis need experienced surgeons who are familiar with the peculiarities of Rheumatoid Arthritis .

• Experience with complex cases
• Availability of special implants
• Interdisciplinary collaboration with rheumatologists
• Individually adapted rehabilitation

Frequently Asked Questions (FAQ) on secondary osteoarthritis in Rheumatoid Arthritis

1. What is secondary osteoarthritis?

Secondary osteoarthritis occurs when an underlying disease – such as Rheumatoid Arthritis – damages the articular cartilage and bones. It differs from primary osteoarthritis, which is usually caused by age and wear.

2. How common is osteoarthritis in Rheumatoid Arthritis?

Very common. Studies show that almost all patients with long-standing rheumatism eventually develop secondary osteoarthritis – especially in the hip and knee.

3. What symptoms indicate secondary osteoarthritis?

Typical symptoms are:

• Pain during exertion and at rest
• Joint swelling and stiffness
• Movement restrictions
• Malalignment such as X- or O-legs

4. Why are the hip and knee particularly affected?

These large joints bear the entire body weight. In rheumatoid arthritis , they are additionally heavily stressed by inflammation and malalignment.

5. How does osteoarthritis in rheumatoid arthritis differ from normal osteoarthritis?

The secondary osteoarthritis progresses more rapidly and combines inflammatory pain with degenerative pain. This makes it particularly burdensome.

6. What therapies are helpful in the early stage?

• Medications against inflammation (rheumatoid therapy, painkillers)
• Physiotherapy and exercise therapy
• Assistive devices such as orthotics or walking aids
• Joint-friendly sports (e.g. swimming, cycling)

7. When is an artificial joint necessary?

If the pain is persistent, mobility is severely limited, and conservative therapies no longer help, a hip or knee prosthesis is the only option.

8. Are surgeries riskier for patients with rheumatism?

Yes, due to osteoporosis, weakened soft tissues, and medication, the risk of infections and wound healing disorders is slightly higher. However, in specialized centers, these risks can be minimized.

9. Which prostheses are suitable for rheumatism?

Often, cemented prostheses are recommended because the bone quality may be reduced. Modern implants can be individually adapted to the joint situation.

10. How long does an artificial joint last in patients with rheumatism?

Even in patients with rheumatoid arthritis , hip and knee prostheses usually last many years. With modern materials, service lives of 15–20 years or more are possible – provided that aftercare is optimal.

11. How does rehabilitation proceed after a prosthesis in rheumatism?

The rehabilitation is individually adapted. Important aspects are:

• Gentle early mobilization
• Training of multiple joints, as often not just one joint is affected
• Close monitoring by orthopedics and rheumatology

12. Why should one have surgery in a specialized center?

Because there is experience with complex rheumatic cases. The ENDOPROTHETICUM Rhein-Main under Prof. Dr. Kutzner offers, for example:

• Individual prosthesis planning
• Special surgical techniques for rheumatism patients
• Interdisciplinary collaboration with rheumatologists

The ENDOPROTHETICUM Rhein-Main – expertise in rheumatism and arthrosis

Under the direction of Prof. Dr. med. Karl Philipp Kutzner the ENDOPROTHETICUM Rhein-Main specializes in hip and knee endoprosthetics – also in complex cases like secondary arthrosis due to rheumatism.

Special advantages for patients:

• Modern surgical techniques (e.g., short-stem hip prostheses, modular knee implants)
• Tailored rehabilitation programs

For patients with Rheumatoid Arthritis this is the optimal care in the final stage of arthrosis.

Conclusion

Secondary arthrosis in rheumatism is a complex clinical picture that particularly affects the hip and knee joints. The combination of inflammation and wear leads quickly to the final stage. Conservative therapies can slow down the process, but not stop it. In the final stage, endoprosthetics of the hip or knee offers the only permanent solution.

Thanks to modern implants, precise surgical planning and specialized centers like the ENDOPROTHETICUM Rhein-Main under Prof. Kutzner, patients with Rheumatoid Arthritis can now lead a pain-free and active life even with secondary arthrosis.