Preoperative Implant Selection
6
Synthes
Titanium Trochanteric Fixation Nail System—Screw Option Technique Guide
Use the AO preoperative planner rulers for the Titanium
Trochanteric Fixation Nail System to determine nail length,
nail diameter, and femoral neck angle.
Note:
Check the magnification on the specific preoperative
planner ruler. Magnification levels are either 0% or 15%.
Determine the typical magnification factor at your institution
and then adjust measurements accordingly. To do this, divide
the measured length by the magnification factor and choose
the nearest nail length. Note that this will provide an esti-
mated nail length and implant size.
Example
(for 0% magnification planner ruler):
– Measured nail length is 420 mm
– Typical femoral x-ray image is enlarged by 5%
(magnification factor 1.05)*
– 420/1.05 = 400
– Estimated nail length is 400 mm
When selecting nail size, consider canal diameter, fracture
pattern, patient anatomy, and postoperative protocol.
* Magnification factor may vary
Tita
niu
m
Tr
oc
ha
nte
ric
Fix
atio
n N
ail
Ru
ler
Fo
r u
se
w
ith
th
e O
rig
in
al
AO
/
AS
IF
Sy
ste
m
o
f In
str
um
en
ts
an
d I
m
pla
nts
. A
SIF
is
a
re
gis
ter
ed
tr
ad
em
ark
o
f S
YN
TH
ES
(U
SA
) a
nd
S
YN
TH
ES
AG
C
hu
r.
17
0 m
m
an
d 2
35
m
m
L
en
gth
s,
fo
r 1
0 m
m
, 1
1 m
m
an
d 1
2 m
m
C
an
nu
late
d N
ails
80
85
90
95
10
0
10
5
11
0
11
5
12
0
12
5
°
13
0
°
13
5
°
10
m
m
11
m
m
12
m
m
17
0 m
m
17
0 m
m
23
5
m
m
23
5 m
m
10
m
m
11
m
m
12
m
m
10 mm
5 mm
0 mm
END CAP EXTENSIONS
m
m
0
Tit
an
iu
m
H
elic
al B
lad
e
80
m
m
–
1
20
m
m
(5
m
m
in
cre
m
en
ts)
La
ter
al V
iew
A-
P V
iew
Fo
r d
ista
l lo
ck
ing
u
se
4.9
m
m
T
ita
niu
m
L
oc
kin
g B
olt
s o
r
5.0
m
m
T
ita
niu
m
L
oc
kin
g S
cre
w
s
A
O
A
SIF
G
P2
02
8-A
1
/0
2
J3
89
8A
M
illim
ete
rs
Illu
str
atio
ns
(
1.1
5 M
ag
nif
ica
tio
n)
