Inflammatory Arthritis of the Knee

Inflammatory arthritis of the knee refers to conditions characterized by inflammation in the knee joint. Unlike osteoarthritis, which results from wear and tear, inflammatory arthritis occurs when the immune system mistakenly attacks the tissues in the joint, causing pain, swelling, and stiffness. Over time, untreated inflammation can damage cartilage, bones, and other joint structures.

The causes of inflammatory arthritis are primarily linked to autoimmune or systemic inflammatory conditions. Some of the most common causes include:

Autoimmune Conditions Diseases where your immune system attacks your joints:

• Rheumatoid Arthritis: Attacks on joint linings often affect both knees
• Psoriatic Arthritis: Connected to the skin condition psoriasis
• Lupus: Can inflame joints throughout the body, including knees
• Ankylosing Spondylitis: Mainly affects the spine but can reach the knees

Crystal Deposits

• Gout: Uric acid crystals build up in joints
• Pseudogout: Similar to gout but caused by calcium crystals

Infection-Related

• Reactive Arthritis: Triggered by an infection elsewhere in your body
• Infectious (Septic) Arthritis: Direct infection in the joint – requires immediate medical attention

Identifying the underlying cause is crucial for tailoring treatment strategies.

Inflammatory arthritis of the knee typically presents with the following symptoms:

• Persistent pain and tenderness in the knee joint
• Swelling and warmth around the knee
• Stiffness, particularly in the morning or after periods of inactivity
• Reduced range of motion
• Fatigue or systemic symptoms such as fever (in conditions like RA or lupus)

If left untreated, chronic inflammation can lead to joint deformity, cartilage loss, and diminished mobility.

Diagnosing inflammatory arthritis involves a combination of clinical evaluation, imaging studies, and laboratory tests. Your physician may recommend:

• Physical Examination: Assessing swelling, tenderness, and range of motion.
• Imaging Studies: X-rays, MRI, or ultrasound to evaluate joint damage or inflammation.
• Blood Tests: Checking for markers of inflammation (e.g., ESR, CRP) and specific antibodies (e.g., rheumatoid factor, anti-CCP).
• Joint Aspiration: Analyzing joint fluid for signs of infection, crystals, or inflammation.

Treatment aims to control inflammation, manage symptoms, and prevent joint damage. Common approaches include:

• Medications:
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce pain and swelling.
  • Disease-modifying antirheumatic drugs (DMARDs) like methotrexate for conditions like RA.
  • Biologic therapies targeting specific inflammatory pathways.
  • Corticosteroids for acute symptom relief.
• Physical Therapy: Strengthening exercises to maintain mobility and joint function.
• Lifestyle Modifications: Weight management and low-impact activities to reduce stress on the knee.
• Surgical Intervention: In severe cases, joint replacement or synovectomy may be necessary.

The Louisville Institute of Orthopaedics provides comprehensive care for inflammatory knee arthritis. Our orthopaedic team finds the proper tests and treatments for your condition. We offer both non-surgical care and surgery to help reduce pain and stiffness.

1. Can inflammatory arthritis of the knee be prevented? While inflammatory arthritis cannot always be prevented, managing risk factors can help reduce its impact. For example, maintaining a healthy weight, managing autoimmune conditions with prescribed medications, and avoiding joint injuries may lower the risk of severe knee inflammation.
2. How is inflammatory arthritis different from osteoarthritis? Inflammatory arthritis results from an immune system attack on the joints, causing inflammation, pain, and stiffness. Osteoarthritis, on the other hand, is caused by wear and tear of the cartilage over time. The two conditions have different causes, treatments, and progression rates.
3. Are there dietary changes that can help with inflammatory arthritis? Certain foods, such as those rich in omega-3 fatty acids (e.g., fish, flaxseeds), antioxidants (e.g., berries, leafy greens), and anti-inflammatory spices like turmeric, may help reduce inflammation. Limiting processed foods, sugars, and alcohol may also support joint health.
4. Can inflammatory arthritis affect other parts of the body? Yes, many types of inflammatory arthritis, such as rheumatoid arthritis or lupus, can affect other joints and organs. Symptoms like fatigue, fever, or skin rashes may indicate systemic involvement.
5. How long does it take for treatments to show results? Treatment timelines vary depending on the type and severity of inflammatory arthritis. Medications like NSAIDs may provide relief within days, while DMARDs or biologics might take weeks to months to reduce symptoms effectively.
6. What can I do at home to manage symptoms? In addition to medical treatment, staying physically active with low-impact exercises like swimming or yoga can help maintain joint function. Applying heat or cold packs to the knee may reduce stiffness or swelling. Following your doctor’s guidance on rest and activity level is also essential.
7. 7. When should I see a doctor about knee pain? See a doctor if you experience persistent knee pain, swelling, or stiffness, mainly if it affects daily activities or worsens over time. Early diagnosis and treatment can prevent further joint damage.