Protocolo diagnóstico de la sacroilitis y la discitis

Sacroiliitis is characterized by lower back pain with an inflammatory rhythm. It is usually in the gluteal area and can be unilateral or bilateral. It sometimes radiates to the pelvic area or lower limbs through the posterior face and can be confused with radicular pain. It is difficult to diagnose, as its presentation is similar to many other causes of back pain; therefore, its diagnosis is by exclusion. It is important to establish the cause of the symptoms, including infectious, degenerative, or idiopathic inflammatory causes (usually in the context of spondyloarthritis), among others. Laboratory and imaging tests such as sacroiliac joint radiography and magnetic resonance imaging (MRI) are used for diagnosis, the latter being very useful in the differential diagnosis.