7 |
Headless Compression and Twist-Off Screws
Surgical Technique
Insertion
Load the screw onto the T7 Cannulated Driver and
Mini Rachet Handle. Place screw over the 0.9 mm
k-wire down to surface of bone. Advance the screw
into bone by turning the T7 Cannulated Driver
clockwise (Figure 6). Continue advancing until
the head of the screw is at or just below the near
cortex. After compression is achieved, remove the T7
Cannulated Driver and 0.9 mm k-wire. Verify screw
position with fluoroscopy (Figure 7).
Drilling (Optional)
Note:
The Zimmer Biomet Headless Compression
screws are designed to be self-drilling and self-
tapping, and may be inserted under power.
If the bone is deemed to be too hard prior to screw
insertion, or an oblique approach is required, use a
Head Relief Drill to prepare the near cortex. For the
2.5 mm screw use the 2.5 mm Head Relief Drill, and
for the 3.0 mm screw, use the 3.0 mm Head Relief Drill
(Figure 8).
Screw Removal
For screw removal, insert the T7 Solid Driver into the
head of the screw, and turn the Driver counterclockwise
until the screw is removed.
Figure 8
Figure 6
Figure 7
2.5 mm Head Relief Drill AO
110027746
3.0 mm Head Relief Drill AO
110027747
Headless Compression Screw Technique – Unicortical Applications
