Spinal Surgery Robot

The system has three elements. A planning workstation loads the patient's computed tomography images and lets the surgeon place virtual screws of a chosen length and diameter into each vertebra, checking the trajectory in every plane. A robotic arm, mounted on the operating table or on a floor cart and rigidly attached to the patient's spine or pelvis through a fixed frame, moves to each planned trajectory and holds a guide tube. A tracking camera watches reflective markers on the patient and on the instruments so that the system always knows where the anatomy is relative to the plan. Spinal robots are frequently paired with intraoperative imaging such as an O-arm or a mobile computed tomography scanner, which produces the images used for registration and, at the end, confirms that every screw sits where it was planned.

Before the operation the surgeon builds the plan: each screw is sized, angled and positioned on the three-dimensional dataset, and the entry point on the bone is defined. In theatre, a rigid reference frame is clamped to the spine or the iliac crest so the patient and the robot share one coordinate system. Registration then matches the plan to the patient, either by taking a scan on the table or by matching intraoperative fluoroscopic images to the preoperative dataset. Once registration is verified, the arm swings to the first trajectory and locks in place. The surgeon drills through the guide tube, taps the track and inserts the screw, checking depth and feel as usual. The arm then moves to the next planned trajectory. If the tracking system detects that the patient has moved, it warns the team and registration is repeated. A final scan documents the position of all the implants before closure.

The robot is used wherever screws or other implants must be placed accurately into the spine: degenerative fusion of the lower back, correction of scoliosis and other deformity, stabilisation of fractures, and fixation after removal of a spinal tumour. It helps most where the anatomy is difficult, such as small pedicles, marked rotation, revision surgery with distorted landmarks and obesity, which limits the quality of fluoroscopic images. It also supports percutaneous techniques, in which screws are placed through separate small openings rather than by stripping the muscle off the spine, which reduces muscle injury and blood loss. Patients benefit indirectly rather than directly: the technology serves accuracy and the smaller approach, while the operation, its indications and its recovery are those of the underlying spinal procedure.

For the patient, robot-assisted instrumentation usually means smaller incisions, less disruption of the back muscles and, in many series, less blood loss and a shorter hospital stay than the equivalent open technique. Published comparisons report high accuracy of pedicle screw placement and fewer screws needing revision, together with a marked reduction in radiation exposure to the surgical team compared with repeated freehand fluoroscopy. The trade-off is time: planning, registration and the setup of the reference frame add to the length of the operation, particularly early in a team's experience. Not every case is suitable, and a surgeon may plan robot assistance for the screws while performing decompression or deformity release in the conventional way. Recovery, restrictions and follow-up are determined by the operation itself, not by the robot, and any implanted screws and rods are permanent in the usual way.