Nail/Lag Screws Positioning
with the One Shot Device
The use of the One Shot device
(1213-3010) is recommended to
predetermine the optimal Lag Screw
placement* (Fig. 26). The One Shot
Device is made of carbon fiber
and works by providing a target to
indicate the position of the K-Wire
on the fluoroscope screen. The
target contains 3 radio-opaque wires
embedded in the arm – a dashed inner
wire and two solid outer wires. These
wires work like a gun sight to indicate
the position of the K-Wire.
The One Shot Device is attached
by slightly pressing the grip and
releasing it when positioned onto the
Tissue Protection Sleeve. To correct
the position or remove the device, the
grip must be pressed.
Note:
The use of the One Shot Device
should not replace any steps in the
T2 Recon Operative Technique.
While pressing the attachment grip,
the device is positioned between the
anterior aspect of the patient’s hip and
the fluoroscope screen positioned for
an A/P view of the hip (Fig. 26, 27).
Note:
It is important to drape the patient
so that the
One Shot Device does
not interfere with any drapes
anterior to the patient’s hip.
When positioned correctly, the target
will appear in the fluoroscopic image
(A/P view) with the dashed inner wire
in the middle of the two solid outer
wires (Fig. 27). If it does not, the One
Shot Device should be moved towards
or away from the patient by pressing
the grip slightly until the target is seen
as described above.
*
Tokunaga et al, Correct lag screw positioning
for the Gamma Nail: Development for the
targeting device for insertion, Osteo Trauma
Care 2005; 13:14-17
Operative Technique
Fig. 27
optimal nail position
too cranial nail position
A/P view
too caudal nail position
Fig. 26
22
Summary of Contents for T2
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