Iatrogenic peritonitis following an incident during ablation of a pedicle screw.

Immediate complications can arise due to faulty implantation of material during fusion procedures, but none have been reported in connection with ablation of material in the spine. We report a case of intraperitoneal migration of a pedicle screw during attempted removal. It crossed the psoas muscle and perforated a small-intestine loop, triggering hemorrhagic shock and peritonitis by perforation. We analyze the causes and mechanisms underlying this exceptional case of migration, with a view to sharing preventive measures. Initial extra-pedicular screw positioning and the pressure exerted to remove it were responsible for this serious incident.