The EXPEDIUM VERSE Pedicle Screw incorporates an
alignment zone within the extended tab. This assists in
aligning the threads of the Correction Key or Unitized Set
Screw with the pedicle screw.
It is recommended that a Quick Stick be used while
inserting a Correction Key or Unitized Set Screw and during
rod reduction. The Quick Stick will provide additional
alignment of the set screw to the polyaxial screw head and
will offer an additional rod capture window of 30 mm in
total, further reducing the potential of cross-threading, and
will also protect against premature breakage of the tabs
during reduction and application of corrective forces. The
Tab Ring additionally offers stabilization of the Reduction
Tabs during the application of increased forces for levels
that have proven difficult to reduce without tab splay.
Caution: During insertion of the Correction Key, the Rod
Lock must not advance beyond the underside of the Poly
Lock.
(FIGURE 42)
If the Rod Lock advances beyond the Poly Lock prior to
final tightening:
• Independent poly and rod locking is not achievable
• The Key Inserter/Tightener may not properly
engage the implant.
• If the inner set screw is too high, the Key Inserter/
Tightener cannot be fully engaged and may result in
driver failure
Insert the concave rod into the proximal and distal anchors.
If the rod has both kyphosis and lordosis, it may be
possible to only insert into the distal anchor to begin.
After proximal and/or distal foundations are secured, the
spine is translated to the rod segmentally by reducing the
rod into the reduction tabs using either the Correction
Key or Unitized Set Screw implants. The benefits of force
distribution are realized when all levels are recruited in a
staged reduction process.
4,6
During rod reduction, once the Correction Key or Unitized
Set Screw contacts the rod and resistance increases, it is
recommended to move to another level to continue
reduction. Repeat this process until the rod has been
captured at all levels.
Rod Lock
Poly Lock
FIGURE 40
FIGURE 41
FIGURE 43
FIGURE 42
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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