Single Rod Derotation - Rotation Around the
Concave Rod
Implant the sagittally contoured concave rod and capture
with Correction Keys or Unitized Set Screws. Overcontouring
of the concave rod can be used to facilitate derotation of the
spine. If desired, tightening the Correction Keys or Unitized
Set Screws in the distal or proximal neutral vertebra can be
used to maintain the alignment of the sagittal rod contour
with the sagittal plane.
Using a Facilitator and the Key Inserter/Tightener assembled
to the Pencil Handle, introduce and reduce set screws along
the length of the concave rod. Care should be taken to
distribute correction forces along the length of the construct.
Resistance at any level while reducing indicates that further
advancement at an adjacent level or Correction Key/Unitized
Set Screw introduction at another level should occur.
Continue this iterative introduction and reduction procedure
until the rod has been reduced on the concave side.
Once the concave side is fully reduced, convert all screws to
monoaxial implants by final tightening the Poly Lock. Using a
counter torque instrument, final tighten the Poly Lock using
the Torque Limiting Handle with the Key Inserter/Tightener.
Final tighten the Rod Locks of the distal neutral level(s).
Apply a facilitator to the next proximal level. Derotate the
proximal vertebra while using the neutral level to apply a
counter-rotation force. Tighten the Rod Lock of the rotated
level to retain the derotation. Repeat the previous steps,
moving proximally toward the apex.
Once all levels have been derotated, the convex rod can be
placed. If additional derotation is desired, the convex rod can
be under contoured. Once both rods are fully reduced, all
Poly Locks along the convex rod must be final tightened.
Compression or distraction can be performed segmentally at
this point if needed. The EXPEDIUM VERSE Screws allow for
parallel compression/distraction on the rod when the Poly
Lock is final tightened and the Rod Lock is loose.
FIGURE 54
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DePuy Synthes Companies
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EXPEDIUM VERSE System
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System Guide
Summary of Contents for EXPEDIUM VERSE
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