Matrix (Degen)
Michael Gabl, Roger Härtl, Nicholas Theodore, Rudolf Bertagnoli
Fig 1 Matrix (degen) pedicle screws and rods. In cases of thoracolumbar-sacral instabilities, the primary goal of surgical procedures is to restore and preserve anatomical alignment, decompress the neural elements, resist forces in all axes of movement, and provide the optimal environment for bone fusion to occur.
Overall, the trend in posterior thoracolumbar-sacral instrumentation is toward smaller, stronger, lower profile constructs. These constructs must be capable of providing multiple points of fixation to yield stronger stabilization with an enhanced likelihood of successful fusion. Stronger and more versatile fixation systems lead to the possibility of eliminating the need for postoperative bracing in most cases.
The matrix system is the answer to multiple unmet clinical needs. It has the added benefit of CoCr rods, reduction screws, and pop-on heads, which all improve the construct strength and stiffness.
The matrix system is a comprehensive thoracolumbar pedicle screw system designed to provide versatility, biomechanical performance, and a total solution to complex posterior pathological challenges.
The system comprises pedicle screws, preassembled polyaxial pedicle screws, locking caps, transconnectors, rods, and polyaxial head implants. Matrix polyaxial pedicle screws feature dual core double-lead threads, a threaded screwdriver holding a sleeve interface, a T25 StarDrive recess, 50° of angulation, and rod reduction features located at the top of the screw head. The matrix snap-on transconnector is a preassembled implant. Its telescoping body is arched to accommodate grafts and anatomical structure. Finally, the jaws of the transconnector swivel and are spring-loaded making placement of the device far easier than in competitor systems.
Fig 2 Matrix transconnector. 
Fig 3 Matrix locking cap insertion. 
Fig 4 Matrix rocker fork. Hazards and labeling
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