When a device (rod) is attached by hooks or screws to the spine only at each end of the device, this is called:

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Nonsegmental instrumentation refers to the method of spinal fixation where a device, such as a rod, is attached to the spine only at its ends, without intermediate attachments along the length of the spine. This contrasts with segmental instrumentation, where the device is attached at multiple points along the spine.

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