OBJECTIVES: The main purpose of this study was aimed at examining the epidemiological and clinical data of firesetters in Konju forensic psychiatric hospital. METHOD: The thirty firesetters were admitted at Konju forensic psychiatric hospital from January. 1, 1998 to December. 1, 1995, They carefully investigated from January. 3, 1996 to July. 31, 1996 through the methods of psychiatric interview, chart review, the written judgement review and telephone interview. RESULTS: There are significant differences in education level and intelligence quotient among three groups. Prevalence of febrile convulsion, nail biting, and enuresis are highest among the firesettes. Alcohol-related family history is significantly high in firesetters. Most frequently reported motivation of firesetters were psychosis, and anger or revenge.
Anger ; Education ; Enuresis ; Hospitals, Psychiatric* ; Humans ; Intelligence ; Interviews as Topic ; Motivation ; Nail Biting ; Prevalence ; Psychotic Disorders ; Seizures, Febrile

PURPOSE: To develop a robot-arm type image-guided surgery system for percuatneous screw fixation of the sacro-iliac joint and to evaluate its accuracy. MATERIALS AND METHODS: We have developed an image-guided surgery system using a three-dimensional digitizer (Microscribe 3-D G2, Immersion, USA) and a personal computer. The registration error and target localization error at fiducial registration were measured 30 times for each using a phantom made with plastic pelvic bone model (Sawbones, USA). Sixteen 6.5 mm cannulated screws were inserted into four plastic bone models, and the accuracy was evaluated. RESULTS: The target localization error was 1.46+/-0.47 mm while the registration error was 0.73+/-0.23 mm. All of the 16 screws were inserted well across the sacro-iliac joint, and there was neither cortical breach nor collision between screws or washers. CONCLUSION: The accuracy of the developed system was similar to that of optical tracker-based navigation systems, and its helpfulness and usefulness was proven with simulation surgery using plastic bone models.
Immersion ; Joints* ; Microcomputers ; Pelvic Bones ; Plastics ; Surgery, Computer-Assisted*