Fig. 5From: Potential risk analysis and experience summarization of unstable factors of cranial fixation devices in neurosurgical operations: three-case reports and systematic reviewThe standard positions of the cranial fixation devices. a Two pins located up and down position of fixes position balanced. b The head frame is tightly connected with the fixing device. c The cardan shaft keeps vertical. d Side view of the standard position of cranial fixation devices. e Positive view of the standard position of cranial fixation devicesBack to article page