Gamma3 Trochanteric Nail 180 - Stryker

Operative Technique
The Trocar is now removed and re -
placed by the calibrated green coded
4.2mm × 300mm drill. Drill through
the first cortex and as the second
cortex is reached read off the measurement
on the drill scale. Add the thickness
of the cortex, which is approximately
5mm, to this measurement to
select the correct screw length
(Fig. 61a).
Alternatively, the drill can be drilled
through the second cortex and monitored
by X-Ray or image intensifier.
The screw length can then be read
directly from the scale on the drill
(Fig. 61a). Proceed to drill the second
cortex.
It is also possible to measure the
correct screw length using the Screw
Gauge after drilling through the
second cortex. The Drill Guide Sleeve
must be removed and the Screw Gauge
may be advanced through the Tissue
Protection Sleeve. Put the small hook
behind the medial cortex and read the
required locking screw length from
the scale.
Insert the 5mm distal Locking
Screw (Fig. 62) through the Distal
Tissue Protector by using the 3.5mm
Screwdriver until the mark on the
Screwdriver shaft approaches the
Protector; advance the screw head
carefully until it is slightly in direct
contact with the cortex (Fig. 61a).
+5mm
direct read out
Fig. 61
Fig. 61a
Fig. 61b
Note:
When the mark on the Screwdriver
shaft reaches the Tissue Protection
Sleeve, this indicates that the screw
head is near the cortex (Fig. 61a).
Take care not to overscrew. The screw
head should come just into contact
with the cortex and resistance should
be felt.
Fig. 62
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