O-arm Navigation

O-arm navigation combines a ring-shaped scanner with a computer navigation system to give the surgeon a three-dimensional map of the spine during surgery, with the instruments tracked on that map in real time — a little like satellite navigation for implant placement. It can be genuinely useful in complex deformity, distorted anatomy, or revision surgery where the usual landmarks are hard to read. It is important to know Mr Madi's own approach, however: by training and preference he is a freehand surgeon, placing screws using anatomical landmarks and the direct, tactile feel of the pedicle. He values freehand for two reasons — it adds no radiation, and it gives an intimate, real-time feel of the bone that is very safe in experienced hands. He therefore uses navigation selectively, for the cases that genuinely call for it, rather than as a routine.

• People having a spinal fusion where screws need to be placed accurately
• People having deformity, revision or complex surgery where the anatomy is distorted or difficult
• Situations where confirming implant position during surgery adds safety
• Its use is decided by the surgeon based on the procedure

• When navigation is used, the ring of the O-arm rotates around the area once you are asleep and captures a detailed 3D scan of your spine on the table. That image is registered — lined up — with your real anatomy using a reference marker, and tracked instruments then appear as a live pointer on the 3D images, so a screw trajectory can be planned and followed precisely. Importantly, Mr Madi does not routinely take a confirmation CT scan at the end of the operation; if a particular situation warrants a check, one can be taken, but it is done on judgement when needed, not as an automatic step — precisely to avoid adding radiation without good reason.

• Highly accurate screw and implant placement, guided by a live 3D map
• The ability to check placement with a scan before leaving theatre, reducing the chance of a return to surgery
• Often less repeated live X-ray (fluoroscopy) once the scan is taken, lowering radiation to the surgical team
• Particularly valuable in distorted or complex anatomy where landmarks are hard to read

• Navigation is an aid, not a replacement for surgical judgement, and the underlying procedure carries its own risks
• The 3D scan involves a dose of radiation to the patient, balanced against the accuracy and safety it provides
• The system must be set up and registered carefully; technical issues can occasionally require falling back on standard X-ray guidance
• The scan adds a radiation dose — one of the reasons careful freehand technique, which uses none, is often preferred
• Navigation is a tool that supports, not replaces, surgical judgement; for many operations experienced freehand placement is an equally safe choice

• Standard fluoroscopy (live X-ray) guidance
• Intraoperative CT navigation using other scanner systems
• Robotic-assisted or electromagnetic navigation
• Freehand technique based on anatomical landmarks

Navigation does not change your recovery directly — that depends on the operation being performed — but by improving accuracy it aims to reduce the risk of a poorly positioned implant and the need for further surgery. Your surgeon will explain how it fits into your specific procedure.

• —Royal College of Radiologists — iRefer: Making the Best Use of Clinical Radiology
• —British Association of Spine Surgeons (BASS)
• —UK Health Security Agency — Ionising Radiation: Patient Dose Information

This information is for general patient education and is not a substitute for an individual consultation. Always seek personalised advice from a qualified spinal specialist.