Proximal aiming device for DFN and R/AFN
The DFN (Distal Femoral Nail) System is an established retrograde intramedullary nailing system to treat distal and diaphyseal fractures of the femur. The spiral blade locking option and the possibility of angular stable fixation with very distal locking made the DFN popular. However, proximal locking performed free-hand is difficult and time-consuming. The new proximal aiming device (PAD) improves proximal locking procedures, enabling the surgeon to lock the nail distally and proximally completely without fluorescent X-radiation. After determination of the nail length the surgeon must calibrate the proximal aiming device to the proposed nail. The proximal guide part leads to the correct location and orientation of the locking holes of the nail. For drilling and screw placement, the proximal guide is used the same way as a normal aiming arm. Compared to the free-hand technique, the PAD offers a simple and effective solution for proximal locking of short DFNs 160, 200, and 240 mm length. For borderline cases, such as very large or small curvature of the femur, or nail with small diameter, the alignment of the locking hole and the PAD needs to be controlled by x-ray examination before drilling. Furthermore, a new aiming arm for distal locking is offered.
R/AFN Arm for Proximal Aiming Device
For the short R/AFN (160200?mm), a new proximal aiming arm enables distal and proximal locking. It consists of a long aiming arm which is mounted onto the R/AFN insertion handle. The arm features drill holes for the proximal interlocking. It also accepts two inserts for distal interlocking, one for distal standard locking and one for distal spiral blade locking.
An aiming sleeve 12.0/8.0?mm with crosshairs, length 188?mm is used to check if the nail locking holes are still in line with the aiming arm holes.
R/AFN Guiding and Calibration Unit
The calibration unit and the guiding unit allow for proximal interlocking with short R/AFN (160200?mm length) using the proximal aiming device (PAD). Compared to the distal femur nail (DFN) the distance between the calibration pins is smaller since the R/AFN proximal interlocking holes are closer together.
The guiding unit is mounted onto the arm of the PAD and used in combination with the calibration unit for proximal locking of the short R/AFN.
Hazards and labeling
Due to varying countries’ legal and regulatory approval requirements, consult the appropriate local product labeling for approved intended use of the products described on this website. All devices on this website are approved by the AO Technical Commission. For logistical reasons, these devices may not be available in all countries worldwide at the date of publication.
This work was produced by AO Foundation, Switzerland. All rights reserved by AO Foundation. This publication, including all parts thereof, is legally protected by copyright.
Any use, exploitation or commercialization outside the narrow limits set forth by copyright legislation and the restrictions on use laid out below, without the publisher‘s consent, is illegal and liable to prosecution. This applies in particular to photostat reproduction, copying, scanning or duplication of any kind, translation, preparation of microfilms, electronic data processing, and storage such as making this publication available on Intranet or Internet.
Some of the products, names, instruments, treatments, logos, designs, etc referred to in this publication are also protected by patents, trademarks or by other intellectual property protection laws (eg, “AO” and the AO logo are subject to trademark applications/registrations) even though specific reference to this fact is not always made in the text. Therefore, the appearance of a name, instrument, etc without designation as proprietary is not to be construed as a representation by the publisher that it is in the public domain.
Restrictions on use: The rightful owner of an authorized copy of this work may use it for educational and research purposes only. Single images or illustrations may be copied for research or educational purposes only. The images or illustrations may not be altered in any way and need to carry the following statement of origin “Copyright by AO Foundation, Switzerland”.
Check www.aofoundation.org/disclaimer for more information.
If you have any comments or questions on the articles or the new devices, please do not hesitate to contact us.
“approved by AO Technical Commission” and “approved by AO Foundation”
The brands and labels “approved by AO Technical Commission” and “approved by AO Foundation”, particularly "AO" and the AO logo, are AO Foundation's intellectual property and subject to trademark applications and registrations, respectively. The use of these brands and labels is regulated by licensing agreements between AO Foundation and the producers of innovation products obliged to use such labels to declare the products as AO Technical Commission or AO Foundation approved solutions. Any unauthorized or inadequate use of these trademarks may be subject to legal action.
AO TC Innovations Magazine
Find all issues of the AO TC Innovations Magazine for download here.
Recognizing outstanding achievements in development and fostering excellence in surgical innovation.