Which method does the ISOLA type of spinal instrumentation typically use?

The ISOLA (In Situ On-Line Adjustment) type of spinal instrumentation typically employs a combination hook and screw method. This approach is designed to provide stability and support to the spine during surgical interventions, particularly in the context of spinal fusion or correction of spinal deformities.

The combination of hooks and screws allows for enhanced fixation to the vertebrae, improving the overall stability of the spinal construct. The hooks are generally situated on the posterior elements of the spine, while the screws are inserted into the pedicles of the vertebrae. This configuration helps to distribute forces more evenly and can facilitate more effective correction of spinal misalignment or deformity.

Moreover, the ISOLA system is designed for intraoperative adjustments, enabling surgeons to modify the tension or alignment of the instrumentation while the patient is still in the surgical field, thus optimizing the positioning and stabilization of the spine in real-time.

In contrast, other methods such as placement of grid electrodes, supralaminar placement of rods, and severing the cauda equina do not fit the characteristics or typical applications of ISOLA instrumentation. The focus of the ISOLA system on biomechanical stability through specific fixation techniques explains why the combination hook and screw method is the correct answer.