Inflammatory Back Pain

Excerpt

Inflammatory back pain (IBP) is chronic pain concentrated in the axial spine and sacroiliac joints, distinguishing it from mechanical back pain through specific diagnostic features. While strongly linked to inflammatory conditions, IBP is not diagnostic.

Several key characteristics help differentiate IBP from other causes of back pain:

1. Localization of pain: IBP is typically localized on the axial spine, particularly the lumbar spine. Additionally, patients may experience alternating buttock pain from one side to another.

1. Patient characteristics: The patient's characteristics, such as age and chronic pain, are crucial in distinguishing IBP. Associated with the onset of pain before the age of 40, persistent pain lasts for 3 months or more.

1. Pain progression: The progression of pain over time is another important factor in diagnosing IBP. The pain often follows an insidious course, gradually worsening over an extended period.

1. Morning Stiffness: Patients with IBP commonly experience morning stiffness, which tends to improve with movement or exercise. This significant feature helps differentiate it from other forms of back pain.

1. Association with inflammatory conditions: While the classic association is with ankylosing spondylitis, IBP may also be present in other seronegative spondyloarthropathies such as psoriatic arthritis (PsA), enteropathic arthropathy, juvenile idiopathic arthritis (RIA), and reactive arthritis.

1. Undifferentiated causes: In some cases, the cause of IBP may be undifferentiated, given the absence or combination of diagnostic features of any of these conditions.