What condition is characterized as an inflammatory spondyloarthropathy with progressive spinal fusion?

What condition is characterized as an inflammatory spondyloarthropathy with progressive spinal fusion?

• A. Gout
• B. Osteoarthritis
• C. Ankylosing Spondylitis
• D. Rheumatoid arthritis

Answer: (C)

An inflammatory spondyloarthropathy that progresses to fusion of the spine is most characteristic of Ankylosing Spondylitis. This condition starts with inflammatory back pain, often in younger adults, with morning stiffness that improves with activity. It commonly involves the sacroiliac joints and over time can cause the vertebrae to fuse (ankylosis), producing a rigid spine or the classic “bamboo spine” appearance on imaging. Key ideas to connect: it is a seronegative inflammatory disease of the spine and sacroiliac joints, driven by enthesitis (inflammation at where ligaments and tendons attach to bone) and new bone formation leading to fusion. There is often a genetic association with HLA-B27, and symptoms may include reduced spinal mobility and alternating buttock pain. How this differs from the other options: gout is a crystal-induced inflammatory arthritis typically affecting a peripheral joint like the big toe and not characterized by progressive spinal fusion. osteoarthritis is degenerative, not inflammatory, and involves wear-and-tear changes rather than inflammatory back stiffness that leads to fusion. Rheumatoid arthritis is an inflammatory autoimmune disease that mainly targets small joints in the hands and feet with symmetric swelling, not the progressive spinal fusion pattern seen in Ankylosing Spondylitis.

An inflammatory spondyloarthropathy that progresses to fusion of the spine is most characteristic of Ankylosing Spondylitis. This condition starts with inflammatory back pain, often in younger adults, with morning stiffness that improves with activity. It commonly involves the sacroiliac joints and over time can cause the vertebrae to fuse (ankylosis), producing a rigid spine or the classic “bamboo spine” appearance on imaging.

Key ideas to connect: it is a seronegative inflammatory disease of the spine and sacroiliac joints, driven by enthesitis (inflammation at where ligaments and tendons attach to bone) and new bone formation leading to fusion. There is often a genetic association with HLA-B27, and symptoms may include reduced spinal mobility and alternating buttock pain.

How this differs from the other options: gout is a crystal-induced inflammatory arthritis typically affecting a peripheral joint like the big toe and not characterized by progressive spinal fusion. osteoarthritis is degenerative, not inflammatory, and involves wear-and-tear changes rather than inflammatory back stiffness that leads to fusion. Rheumatoid arthritis is an inflammatory autoimmune disease that mainly targets small joints in the hands and feet with symmetric swelling, not the progressive spinal fusion pattern seen in Ankylosing Spondylitis.