22/11/2012
AO Technical Commission Approved

TFN Set Screw

Some surgeons like the option of preventing sliding of the TFN helical blade or screw in certain situations, such as, reconstructive procedures, gun shot injuries, reverse obliquity fractures, and tumors. In order to prevent collapse of the head element, the TFN Set Screw (Fig a) was developed. Once the set screw is tightened with a torque limiting handle, the grooves on the underside of the TFN Set Screw engage with the helical blade or screw to prevent sliding. It is available in 3 angles (125, 130 and 135) in order to match the CCD angle of the nails, and is made of TAN (alloy).

If a surgeon wants to prevent sliding, the scrub technician has to remove the TFN locking mechanism from inside the nail, on the back table, and replace it with the pre-assembled TFN Set Screw. The surgeon must make a conscious decision to replace the locking mechanism with the TFN Set Screw, which helps ensure the surgeon does not unintentionally prevent sliding.

Self-retention between subcomponents of the TFN Set Screw allows for ease of insertion. After the head element is inserted, the surgeon will use a torque limiting handle to tighten the set screw and prevent collapse. If the surgeon changes his or her mind and wants to allow sliding, the tang is long enough that the set screw can be backed off to allow sliding, while still preventing rotation. If sliding is permitted, however, an end cap must be used in conjunction with the set screw.

It is important to note that the TFN Set Screw should only be used for fixation in fractures where sliding of the head element is not desired. The addition of the locking feature expands the utility of the TFN system. While it should only be used in select cases, the new locking feature offers an alternative fixation option for certain difficult and complex fractures.

 

The TFN Set Screw with long tang and grooves on the underside (a) allows the surgeon to lock the TFN head element to prevent sliding (b).

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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. 


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