When a device (rod) is attached by hooks or screws to the spine at each end of the device and to at least one other point of the spine along the device, this is called:

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Segmental instrumentation refers to the method of attaching a device to the spine at multiple points along its length, allowing for fixation at each segment it spans. This contrasts with nonsegmental instrumentation, which attaches at the ends only.

When a Device (Rod) Is Attached by Hooks or Screws