1000
10,000
100,000 1,000,000 10,000,000
4.5 (1011 lbs)
4.0 (899 lbs)
3.5 (787 lbs)
3.0 (674 lbs)
2.5 (562 lbs)
2.0 (449 lbs)
1.5 (337 lbs)
1.0 (225 lbs)
0.5 (112 lbs)
0
TFN
6
Test conducted at Legacy Research and Technology Center, Portland, OR.
7
Test conducted at Synthes Mechanical Testing Lab, West Chester, PA.
The 11.0 mm helical blade reduces amount of bone
removed
6
By using the 11.0 mm helical blade, significantly less bone is
removed than with a predrilled lag screw.
The helical blade compacts trabecular bone around the blade
as it advances into the femoral head.
Note:
The amount of bone removed by an implant is directly
related to its cross-sectional area. The helical blade’s cross-
sectional area is only 38% that of a standard lag screw.
Longer fatigue life in mechanical testing
7
Example of bone removal
with standard lag screw
Example of bone removal
with helical blade
L
o
a
d
[
k
N
(
lb
s)
]
Fatigue life
Cycles
IM Device
with Lag Screw
TFN – Titanium Trochanteric Fixation Nail System
Technique Guide
Synthes
5