Surgical Technique USS™ Universal Spine System DePuy Synthes 7
Pedicle hook positioning
The USS Pedicle Hooks can be anchored in the pedicle
with a single Ø 3.2 mm USS Screw for Pedicle Hook.
1. Prepare seat for pedicle hook
Prepare the pedicle using the Pedicle Feeler (1)
(388.510). Place the pedicle feeler between the inferior
and superior facet joints.
Precaution:
Make sure to place it in the articular
space and not into the bone of the inferior facet.
To facilitate the insertion of the pedicle feeler, a small
portion of the inferior facet is removed with an osteo-
tome (2). The pedicle feeler has six lines on the blade.
When the last line is reached, sufficient bone has been
removed to accommodate the hook around the pedicle.
Check the optimal position of the pedicle feeler by mov-
ing it laterally and cranially (3).
Precation:
Do not push medially.
Remove the pedicle feeler.
2. Position pedicle hook
Pick up a pedicle hook from the tray with the hook and
screw holder as described on page 3.
Note:
Use a front-opening hook if a rod connector is
needed.
Insert the USS Hook Positioner (388.630) into the screw
hole of the hook and ease the pedicle hook into the pre-
viously prepared seat. Check if the pedicle hook is snug
around the pedicle by axial loading of the hook posi-
tioner and also by pushing laterally. The pedicle hook
should not move. Gently tap the hook positioner with a
hammer to firmly seat the hook.
Remove the hook positioner and the USS handle. The
stick remains attached to the hook.
1
2
3
3
3–4 mm
