26/11/2004
AO Technical Commission Approved

2.4 mm Cannulated Screw System

A clinical need exists for a tiny, cannulated screw for fixation of fractures and nonunions of small bones, and small bone arthrodeses. The 2.4 mm Cannulated Screw provides an alternative for the same indications as the 3.0 mm Cannulated Screw, but it can also be used for fractures in smaller bones of the hands and feet. The primary usage of these screws will be as independent lag screws in small bones for hand and foot surgery Furthermore, the use of these small screws avoids excessive bone removal when implanting, solving the clinical issue of excessive bone removal in small bones.

The 2.4 mm Cannulated Screw System is the smallest cannulated screw offered for small bone indications in the hand and foot. The system features 2.4 mm Cannulated Screws ranging from 10.0 mm to 30.0 mm long and is offered in short and long threads. A 0.8 mm guide wire and related instrumentation allows for precise placement of the screw. The screw system complements existing cannulated screw systems by providing a smaller option than 3.0 mm for small bone fractures. The system addresses needs that were previously unmet by the larger screws.

The 2.4 mm Cannulated Screw Set features mini-cannulated screws made in stainless steel, and their related insertion instruments. Long thread screws range from 1020 mm in 1.0 mm increments and 2230 mm in 2.0 mm increments. Short thread screws range from 1720 mm in 1.0 mm increments and 2230 mm in 2.0 mm increments. The screws are self-drilling and self-tapping and have a StarDrive head that allows for self-retention and improved torque transmission. The system is housed in a module that fits in the Modular Hand System or Modular Foot Sets.


34-year-old patient, radial styloid fracture, good bone quality, 1.2 mm screw used.

a Preoperative x-ray.
b Follow-up after 1 week, AP view.
c Follow-up after 1 week, lateral view.
d Follow-up after 1 week, oblique view.
e Follow-up after 4 weeks, AP view.
f Follow-up after 4 weeks, lateral view.
g Follow-up after 4 weeks, oblique view.

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