VERTEBRAL BODY DEROTATION
Equipment
2997-04-220
Key Inserter/Tightener
2997-04-230
X25 Inserter/Tightener
2997-04-320
Torque Limiting Handle 80in-lb (9Nm)
2997-04-205
Facilitator
Quick Stick Assembly – Comprised of:
2997-04-215
Quick Stick Sleeve
2997-04-217
Quick Stick Tube
2997-04-255
Counter Torque Handle
Alternative Equipment
2797-52-130
Hook Pusher
2797-88-955
Derotation Quick Stick Frame
2867-37-010
Viper Top Loading Derotation Frame
Significant coronal plane correction can be consistently
obtained during scoliosis correction with the use of pedicle
screws.
2,9,10
True axial plane correction can also be achieved
to address the rotational deformity of the spine, ribs, and
chest wall. The main goal of vertebral body derotation (VBD)
is to achieve rotational deformity correction, which may
decrease the need for thoracoplasty.
With a traditional instrument based deformity system, a
combination of pedicle screw types is required to achieve
rotational correction of the deformity. On the concave side, a
combination of monoaxial, uniplanar, polyaxial, and
reduction screws can be used. On the convex side monoaxial
and uniplanar or polyaxial screws are placed into the pedicles.
The EXPEDIUM VERSE Spinal System provides intraoperative
conversion of polyaxial screws into monoaxial screws,
providing a means to obtain derotational correction with a
single implant type.
(FIGURE 46)
By tightening the Correction Key Poly Lock and using
Facilitators or Quick Sticks, vertebral body derotation (VBD)
can be performed as for any monoaxial screw. VBD is most
effective when done with a single rod attached to the spine
or prior to both rods being fully reduced.
The hypermobility or increased angulation of the polyaxial
head in combination with the extended tabs enable loose
capture of the concave rod allowing the rod to move within
the screw head while upward derotation forces are being
applied to the concave side and downward derotation forces
are being applied to the convex side. Axial correction can be
retained by advancing the Correction Key or Unitized Set
Screws of the concave pedicle screws during application of
derotation forces.
Facilitators and Quick Sticks are available for the
application of derotation forces. Facilitators slide over
the implant head and provide a lever arm for
derotation maneuvers, but are not suitable for rods
that are not fully reduced.
Quick Sticks are locking facilitators which can be applied to
the concavity of the apical levels. This instrument will
engage the TOP NOTCH Feature of the screw allowing the
application of an upward or pulling force during the
derotation maneuver. Quick Sticks are also capable of
capturing 30mm of total reduction for rods yet to be
reduced into the screw head.
FIGURE 46
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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