Surgical treatment of patients with primary and metastatic spinal tumor with use of the O-Arm intraoperative portable computed tomography scanner

The study objective is to demonstrate our experience of employment of O-Arm intraoperative portable сomputed tomography scanner combined with navigation system Stealth Station Treon Plus (Medtronic Navigation) during decompressive-stabilizing surgeries for patients with primary and metastatic spinal tumors.Materials and methods. We have reviewed results of surgical treatment of 44 patients (24 males and 20 females, average age is 54.3 ± 1.8), who were hospitalized and operated in the department of spinal neurosurgery in Federal Centre of Neurosurgery (Tyumen). All surgeries were performed by one surgical team in the period of April 2011 to June 2017. All patients underwent full clinical examination according to diagnostic algorithm, including assessment of general condition, degree of bone and visceral dissemination, neurological status, quality of life, pain syndrome intensity. The most common cause of vertebral lesions was plasma cell myeloma (15 patients, 34.1 %), metastatic spinal lesions (12 patients, 27.3 %). Patients were subjected to posterior decompression and stabilization with total and subtotal excision of mass lesions. Assessment of degree of decompression and transpedicular fixation were carried out visually using O-Arm combined with navigation station.Results. In 6 to 12 months after surgery 79.5 % of patients demonstrated significant improvement of neurological status, specifically a decrease of conduction and sensory disorders. Degree of pain syndrome was reduced by 3.6 times. Using O-Arm combined with navigation station we placed screws adequately in 99.6 % of the cases. The main technical problem that occurred during the surgery was the failure of navigation system caused by: defect of reflective spheres, distant installation and shift of referential frame, aging of Jamshidi needle, malfunction of navigation camera, failure of data transfer from navigation station.Conclusion. The use of O-Arm combined with navigation station for decompressive and stabilizing surgeries in patients with spine and spinal cord tumors let us perform surgeries with 3D control and navigation, conduct surgeries in areas where it is hard to determine surgical landmarks, ensure precision of transpedicular screw implantation, accomplish total resection of mass lesions with minimal blood loss and less aggressive surgical intervention and properly decompress the spinal canal which, eventually, result in positive anatomical and functional characteristics, and contribute to good general outcome of surgical intervention.Conflict of interest. The authors declare no conflict of interest.Informed consent. All patients gave written informed consent to participate in the study and to the publication of their data.