Synthes TFN, Technique Manual

Page: 11 / 84

Preoperative Implant Selection
Use the AO preoperative planner rulers for the Titanium
Trochanteric Fixation Nail System to determine nail length,
nail diameter, femoral neck angle and head element length.
The head element should be centered in the AP and lateral
views of the femoral head.
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
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*
TFN – Titanium Trochanteric Fixation Nail System Technique Guide Synthes 9