RESUMEN
INTRODUCTION: Pyogenic sacroiliitis, a rare form of septic arthritis, occurs in patients following trauma, intravenous drug use, genitourinary infections and pregnancy. Here we report a rare case where both acupuncture and pregnancy served as predisposing risk factors to the development of this infection. CASE PRESENTATION: A 33-year-old white woman received several sessions of acupuncture treatment during her gestation at the site of her sacroiliac joint for sciatica; she developed biopsy-confirmed sacroiliitis with methicillin-sensitive Staphylococcus aureus during the immediate postpartum period. The diagnosis, medical management and treatment course are described. CONCLUSIONS: Low back and pelvic pain are common conditions during pregnancy and postpartum. Acupuncture is a common modality of medication-free treatment used by many patients. Recognition of the potential complications of such therapies can lead to early diagnosis, accurate treatment, decreased morbidity and increased chances for a successful outcome.