Pre-drilling the lateral cortex
Fig. 45a
65mm
Fig. 44
Fig. 45
Fig. 42
Fig. 43
Operative Technique
Pre-drilling opens the lateral cortex
for the drill entry. Pre-drilling helps
to prevent a possible slipping of the
drill on the cortex and may avoid
deflection within the cancellous bone.
The Paddle Trocar Assembly is
then removed and the Drill Sleeve
is inserted through the Long Tissue
Protection Sleeve (Fig. 42). With the
Long Tissue Protection Sleeve firmly
engaged in the cortex, the lateral
cortex should be opened using the
centered tip green coded 4.2mm Drill.
The Drill can be connected with
the AO Teardrop Handle Coupling
allowing pre-drilling by hand (Fig.
43). It also can be done using power.
Note:
For optimal stability, the tip
of the oblique screw should be
positioned at the level of the lesser
trochanter (Fig. 44).
Then use the center-tipped, calibrated
Ø4.2 × 340mm Drill and drill through
both cortices (Fig. 45).
The screw length may be read directly
from the Calibrated Drill at the end of
the Drill Sleeve (Fig. 45a).
Caution:
Start the drill before touching
the bone and then keep a gentle
pressure on the pre-drilled cortex
to ensure ac cu rate drilling.
Note:
The position of the drill end, as
it relates to the far cortex, is the
same position where the screw
will end.
30
Содержание T2
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