Inflammatory Arthritis of the Hip

There are more than 100 different forms of arthritis, a disease that can make it difficult to do everyday activities because of joint pain and stiffness.

Inflammatory arthritis occurs when the body's immune system becomes overactive and attacks healthy tissues. It can affect several joints throughout the body at the same time, as well as many organs, such as the skin, eyes, and heart.

There are three types of inflammatory arthritis that most often cause symptoms in the hip joint:

• Rheumatoid arthritis;
• Ankylosing spondylitis; and
• Systemic lupus erythematosus.

Although there is no cure for inflammatory arthritis, there have been many advances in treatment, particularly in the development of new medications. Early diagnosis and treatment can help patients maintain mobility and function by preventing severe damage to the joint.

Anatomy

The hip is a ball-and-socket joint. The socket is formed by the acetabulum, which is part of the large pelvis bone. The ball is the femoral head, which is the upper end of the femur (thighbone).

A slippery tissue called articular cartilage covers the surface of the ball and socket. It creates a smooth, low-friction surface that helps the bones glide easily across each other. The surface of the joint is covered by a thin lining called the synovium. In a healthy hip, the synovium produces a small amount of fluid that lubricates the cartilage and aids in movement.

The anatomy of the hip.

Description

The most common form of arthritis in the hip is osteoarthritis — the "wear-and-tear" arthritis that damages cartilage over time, typically causing painful symptoms in people after they reach middle age. Unlike osteoarthritis, inflammatory arthritis affects people of all ages, often showing signs in early adulthood.

Rheumatoid Arthritis
In rheumatoid arthritis, the synovium thickens, swells, and produces chemical substances that attack and destroy the articular cartilage covering the bone. Rheumatoid arthritis often involves the same joint on both sides of the body, so both hips may be affected.

Ankylosing Spondylitis
Ankylosing spondylitis is a chronic inflammation of the spine that most often causes lower back pain and stiffness. It may affect other joints, as well, including the hip.

Systemic Lupus Erythematosus
Systemic lupus erythematosus can cause inflammation in any part of the body, and most often affects the joints, skin, and nervous system. The disease occurs in young adult women in the majority of cases.

People with systemic lupus erythematosus have a higher incidence of osteonecrosis of the hip, a disease that causes bone cells to die, weakens bone structure, and leads to disabling arthritis.

Cause

The exact cause of inflammatory arthritis is not known, although there is evidence that genetics plays a role in the development of some forms of the disease.

Symptoms

Inflammatory arthritis may cause general symptoms throughout the body, such as fever, loss of appetite and fatigue. A hip affected by inflammatory arthritis will feel painful and stiff. There are other symptoms, as well:

• A dull, aching pain in the groin, outer thigh, knee, or buttocks
• Pain that is worse in the morning or after sitting or resting for a while, but lessens with activity
• Increased pain and stiffness with vigorous activity
• Pain in the joint severe enough to cause a limp or make walking difficult

Contact Parkland's hip specialists to receive comprehensive evaluation and management for hip and waist problems.