10
Synthes
USS II Polyaxial Technique Guide
Surgical Technique
1
Open pedicles and determine screw lengths
Required instruments
Pedicle Awl, length 230 mm 388.550
Pedicle Probe
⭋
3.8 mm, length 230 mm 388.540
Optional instruments
Pedicle Probe
⭋
4.8 mm, length 230 mm 388.539
Pedicle Probe
⭋
2.8 mm, length 230 mm 388.538
Localize pedicles as described in AO ASIF Principles in Spine Sur-
gery
1
. With the Pedicle Awl, open the cortex of the pedicles to a
depth of 10 mm. Continue opening the pedicles using the Pedi-
cle Probe
⭋
3.8 mm.
Determine the lengths of the USS II Polyaxial screws.
Note:
If screws
⭋
7.0 mm are implanted as the first screws, use
the Pedicle Probe
⭋
4.8 mm. If screws
⭋
4.2 mm are implanted
as the first screws, use the Pedicle Probe
⭋
2.8 mm.
1
Aebi, Thalgott, Weber
2
Insert screws into pedicles
Required instruments
Screwdriver, bihexagonal,
⭋
3.0 mm, with T-Handle 03.607.001
USS II Polyaxial Holding Sleeve 03.607.003
Optional instruments
Screwdriver Shaft for USS II polyaxial cancellous bone screws
with lengths ≥ 70 mm 03.607.002
USS II Polyaxial Handle 03.607.006
Pick up the appropriate screw from the screw rack using the
Screwdriver and the Holding Sleeve. Insert the screw into the
prepared pedicle until the screw is well seated.
Note:
If cancellous bone screws with a length of 70 mm or
longer are inserted, use the Screwdriver Shaft 03.607.002
attached to the USS II Polyaxial Handle.
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