Zimmer Biomet Headless Compressionand Twist-Off Screws, Хирургическая техника

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Headless Compression and Twist-Off Screws
Surgical Technique
Figure 4
Osteotomy (cont.)
Once the osteotomy has been completed, slide the
plantar segment of the metatarsal head proximally to
the desired position (Figure 3).
Note:
For applications other than a Weil osteotomy,
it may be necessary to measure for screw length
prior to insertion. To do so, insert the 0.9 mm
k-wire across the osteotomy to the desired depth.
Slide the depth gauge over the k-wire ensuring that
it is sitting flush with the bone. The depth gauge
displays the measurement from the distal tip of the
depth gauge to the top of the k-wire.
Figure 3 Figure 5
Insertion
Hold the head against the metatarsal with the
forefinger. The placement of a dorsal clamp aids
in accurate head positioning and desired fixation.
Using the Pin Driver on the Twist-Off Screw, drive the
screw into the bone slowly under power at the same
trajectory as was the k-wire (Figure 4).
Note: To reduce the potential for the tip of the
screw to slide down the bone while under power,
perforate the near cortex with the 0.9 mm k-wire
prior to screw insertion (Figure 5).
Twist-Off Screw Technique