We present a case of septic arthritis of a lumbar facet joint with an assoc
iated epidural abscess. A 13-year-old boy was hospitalized with acute sever
e back pain and fever after pyonex was done. The infection was precisely lo
calized with magnetic-resonance imaging, bone and gallium scintigraphy-He r
esponded to antibiotic therapy. We suppose that the infection was caused by
pyonex because the blood cultures were negative, and the patient had an ab
rupt onset of severe pain:and fever 24 h after the acupuncture.