Zimmer Biomet Headless Compressionand Twist-Off Screws, Хирургическая техника

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Headless Compression and Twist-Off Screws
Surgical Technique
Figure 5
Screw Measurement
The length of the screws is measured using the depth
gauge. Slide the depth gauge over the 0.9 mm k-wire
down to bone ensuring the depth gauge is sitting flush
against bone.
Note: The depth gauge is only compatible with the
0.9 mm x 70 mm and 0.9 mm x 105 mm k-wires.
The depth gauge displays the measurement from the
distal tip of the depth gauge to the tip of the k-wire.
Important: The screw length may vary depending
upon the level of obliquity applied to the k-wire
during insertion. To determine the screw length, and
with the obliquity of the k-wire in mind, record the
measurement. Using the K-Wire Obliquity Chart
below, subtract the corresponding milimeters from
the recorded measurement (Figure 5).
It is recommended that each screw length be verified
off the screw caddy measurement slot before the
screw is implanted.
90° degrees 45° degrees 22.5° degrees
K-Wire Obliquity
90 degrees Subtract 0 mm from measurement
45 degrees
Subtract 2 mm from measurement
22.5 degrees Subtract 5-6 mm from measurement
Headless Compression Screw Technique – Unicortical Applications