Description of the implants
The OMEGA pelvic plate enables to stabilize most of the acetabulum fractures. It temporarily replaces the unstable part of the ring in the area of the injured acetabulum by fixation to the steady sections of the pelvic ring. It completes reduction and prevents a further protrusion of the fragments into the lesser pelvis area due to its relatively large area and rigidity
A set of plates designed specifically for the left and right sides is available. There are 4 types of the plates for the left side and 4 for the right side in total. The individual plates differ from each other by the number of holes and by their design. The design of the plate and the modified mechanical properties of the material allow its shaping. The plates are made of the implant steel according to ISO 5832-1, the thickness of the plates is about 3 mm. Reductions are made between the holes for easier bending when shaping them. The plates are provided with holes with countersunk for the bone screw heads allowing the fixation of the plate to the bone. The fixtures are also provided with holes and they allow the plate to be secured in the second plane after their shaping. The plates are available in the basic, ILIAC, LONG and MAXI versions. All of these types are in the left and right designs. The oval-shaped holes with the special design for an easy insertion of the screw with up to 45 ° inclination are in the dorsal side of the plate.
a) Basic OMEGA pelvic plate
The plate is designed for most of the fractures of the anterior column of the acetabulum, the quadrilateral surface, fractures above the arcuate line and also the lateral fractures of the superior pubic ramus. The design of the plate is based on the shape of the pelvic straight plate with an arc-shaped extension, reminding of the reversed omega letter. There are three holes in this part of the plate that allow shaping of the plate and the use of a fixation screw in the back of the arc. The central hole is not intended for the screw insertion, it is designed to support the instrument - a ball spike when repositioning and fixing the plate. Two pressure fixtures over the arc of the plate stabilize the fragments above the arcuate line, they work similarly to the reversed "spring plates". There are four oval openings in the dorsal part of the plate with a single fixture. There are six screw holes and four fixtures in the frontal part of the plate.
b) ILIAC OMEGA pelvic plate
The plate is intended for fractures of the acetabulum extending into the area of the posterior column. It is possible to insert a long screw through one of the dorsal fixtures using a connected iliac approach and to stabilize the simple fractures in the area of the posterior column of the acetabulum this way. The design of the ILIAC plate is based on the basic design of the OMEGA plate. The dorsal part is extended by two additional fixtures.
c) LONG OMEGA pelvic plate
The plate is designed for a large pelvis where the basic design of the OMEGA pelvic plate is unsatisfactory. The design of the LONG plate is based on the basic design of the OMEGA plate. It is extended by one added oval hole in the basic part of the plate in its dorsal part.
d) MAXI OMEGA pelvic plate
The plate is designed for the largest damage to the quadrilateral surface. This implant can be used to stabilize the posterior column only from the modified Stoppa approach in suitable indications, when two screws are inserted into both holes of the back arch of the plate. The design of the MAXI plate is based on the basic design of the ILIAC OMEGA plate. The omega-shaped enlargement is enlarged and allows insertion of the screw into the two back holes of the arc of the plate, at the same time the lower edge hole is positioned obliquely.
The plate can be secured with the conventional HA 3.5 cortical screws and HB 4 cancellous screws.
The instrumentation is selected to ensure the plate shaping and the fixation screws insertion. Note: Special instruments for plate shortening or special bending facilities are not the part of the instrumentation.
The OMEGA plate use is indicated for the following fractures:
- transverse acetabular fractures
- T-shaped acetabular fractures
- fractures of the acetabulum anterior wall and anterior column
- combined fractures of the acetabulum
- fractures of the acetabulum posterior wall and posterior column
Publications and clinical results
Use of the Omega Plate for Stabilisation of Acetabular Fractures
Fixation of acetabular fractures. a novel method of pre-operative Omega plate contouring
The shape and design of the plate allows:
- to stabilize complicated fractures of the superior pubic ramus, anterior acetabular column, quadrilateral surface, fractures in the area above the arcuate line, and simple fractures of the back column
- the unique reduction and joint area retention
- the plate may be left in situ in case of a late TEP application
High stability of the fixation
The high stability of the implant is secured by two plane fixation of the fragments.
The plate can be anatomically pre-shaped based on the order and the CT scans and then sent to your workplace.
Note: However, it is always necessary to check the logistical options for delivery in time.