Two Rod Derotation
Implant both rods and capture them with either Correction
Keys or Unitized Set Screws. The convex screws must be
converted to monoaxial screws by engaging the Correction
Key’s Poly Lock. The Correction Key’s Rod Lock must not be
applied since lengthening of the spine is expected at each
level that will be segmentally derotated. The pedicle screws
of the concave side should not be fully reduced as the
derotation maneuver will bring the concave pedicles up to
the rod. Only the Correction Key/Unitized Set Screws in the
distal neutral vertebra must be tightened.
Attach Facilitators or Quick Sticks to the distal neutral
segment. Lock this level by tightening the Poly Lock and then
the Rod Lock. Attach a Facilitator to the convex side of the
next proximal vertebrae. Attach a Quick Stick to the
contralateral, concave side. The Facilitator/Quick Stick on the
neutral level must be used to apply a counter force as the
rotated segment is corrected to a neutral position.
The EXPEDIUM Derotation Frame (2797-88-955) can be side
mounted to either Facilitators or Quick Sticks of the same
vertebral level allowing them to be rotated in unison.
Similarly, the Viper Top Loading Derotation Frame (2867-37-
010) can be top mounted to the Quick Sticks to provide the
same benefit.
Repeat the derotation for each segment, until all vertebral
levels nearly match the neutrally rotated distal vertebra.
Once derotation has been achieved and the rods have
been fully reduced, segmental compression (convexity)
and/or distraction (concavity) may be simultaneously
applied to affect maximal correction, just before the Rod
Lock is tightened.
If required, additional coronal correction can be achieved
with the use of EXPEDIUM Coronal In-Situ Benders.
FIGURE 53
DePuy Synthes Companies
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EXPEDIUM VERSE System
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System Guide
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Summary of Contents for EXPEDIUM VERSE
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