Transforaminal Lumbar Interbody Fusion

Easy implantation – maximum support

The transforaminal cage of innovative “structural titanium” (ST) offers an anatomically molded design and variable insertion techniques


The implant is made of the proven material titanium (Ti6Al4V).
"ST" Structural Titanium - is an open-pore titanium grid structure with anatomic parameters designed to optimize intercorporal fusion.
The structured interior with defined porosity offers the bone an ideal "anchor" for ingrowth of blood vessels and bone cells.
With good to excellent fusion results, porous implants have become established as the gold standard for endoprosthetics.* With our WOMBAT ST fusion implant, we are now building on these results for use in the spine.
WOMBAT ST consists of a titanium grid structure that, with its defined pore design, imitates the architecture of natural bone. The interconnectivity of the pores ensures optimal oxygen and nutrient supply, creating an optimized basis for bony ingrowth. The implant also offers more room for fusion, with 70 % of WOMBAT ST consisting of pores. The roughness of the implant - in addition to its proven SIGNUS teeth design - optimizes the primary stability and counteracts migration of the implant. In addition, the lateral surfaces are embedded in a smooth frame in order to keep the amount of preparation needed low and to protect the nerval structures during implantation.

With WOMBAT, we offer a TLIF implant that, by contrast to the classic banana-shaped cages, is positioned diagonally in the intervertebral space. Bilateral support is thereby achieved in spite of the unilateral access - and that with in just one surgical step!

Besides the simple implantation technique, the bone-implant contact area and the filling volume can in addition be maximized by utilization of the entire diagonal diameter of the vertebral body.
The large fenestration in the implant permits the cage to be packed with natural or synthetic bone graft substitute such as Kainos® Inject.
Due to its biconvex design, the implant can be aligned perfectly with the curvature of the vertebral body and so is ideally suited for unilateral, posterior access (TLIF) in the L1-S1 region of the spine.
Combined with an additional posterior instrumentation and toothed endplate, the inserted cage ensures high primary stability and optimal conditions for vertebral body fusion.
Restoration of the intervertebral space can be guaranteed by a large selection of implants that at the same time offer a high degree of intraoperative flexibility. In addition to plane-parallel implants, the WOMBAT cage is also available with a 6° lordotic angle.

Rader CP; Hendrich C; Löw S; Walther M; Eulert J. Unfallchirurg 103, 846-852, 2000. Selmitsch M. In:
Zweymüller K (Hrsg): 10 Jahre Zweymüller-Hüftendoprothese; S. 14-19, 1990

In addition, the open-pore ST diamond grid structure provides optimal conditions for new osteoblasts to infiltrate as far as the inside of the implant. The flattened nose facilitates implantation.

In addition to plane-parallel implants, the WOMBAT ST Cage is also available with a 6° lordotic angle.

The WOMBAT ST cage is used in combination with posterior stabilization for spinal segments L1 to S1, in the following indications:

  • Mechanical instability
  • Disc prolapse
  • Spondylolisthesis
  • Degenerative disc diseases
  • Spinal canal stenosis
  • Osteochondrosis

Productspecific advantages

Open, macroporous titanium structure

  • Resembles natural cancellous architecture
  • Enables both growing-on and growing-in of bone

Diagonal implant placement

  • Easy and rapid implantation in a single surgical step
  • No complicated turning of the implant as needed for banana-shaped cages

Flattened implant apex

  • Easier implantation with self-distracting design
  • No removal of the posterior edges of vertebral bodies

Large contact area with the vertebral body

  • Secure implant positioning
  • Reduced risk of subsidence

Biconvex design with or without lordosis

  • Anatomical adaptation in the intervertebral space
  • Optimal restoration of the sagittal alignment

Increased roughness in conjunction with proven SIGNUS toothed cage design

  • Secure anchoring in the bone owing to high primary stability
  • Reduced risk of implant migration

Smooth lateral surfaces

  • Less preparation required
  • Protection of nerve roots