Abstract
This report deals with a case of pyogenic infection of the sacroiliac joint. This case is a twenty-year old female. After falling directly on the buttock, she had a pain in her right buttock. From the next day, she could not walk and fever appeared. At the time of admission, her temperature was 38.2°C. She could not turn over from prone position because of the pain in her right buttock. There was a maximal tenderness and a slight swelling on her buttock and right thigh. Laboratory studies showed white blood cell count of 27, 600/mm3, and an erythrocyte sedimentation rate accelerated above 150mm per hour, and CRP was strongly positive (27.5mg/dl). Roentgenograms showed narrowing of the right sacroiliac joint. Computed tomography revealed soft tissue swelling adjacent to the right sacroiliac joint. 99mTechnetium pyrophosphate bone scanning showed an accumulation at the right sacroiliac joint. A large abscess formation adjacent to the right sacroiliac joint and the right femur was recognized with MRI. Immediately antibiotics were used. After ten days the focus was incised and drainage of the abscess was performed. The pain and fever were reduced quickly after the surgery. Staphylococcus aureus was found for the disease-causing micro-organism. Simple bed rest was continued for about six weeks. After two months from the surgery, weight bearing on right lower extremity had begun. Antibiotics were used for two months. Though a satisfactory result was obtained, ankylosis of the right sacroiliac joint was seen on roentgenograms one year after the onset of the disease.
