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Product Overview


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Using a posterior approach, the implant is introduced into the intervertebral space to enhance arthrodesis through bone fusion. 

The open geometry of this intersomatic cage explains it’s unique characteristics which enhance the quality of bone graft.



Graft and fusion

A single vast grafting area

  • The quality and contact surface of the graft are essential for the success of a lumbar intersomatic arthrodesis by posterior approach.
  • The ROI concept favours grafting by creating a single FUSION CHAMBER.

A vast and single end-plate freshening area

  • A meticulous freshening of vertebral end-plates allows an optimal bone-to-bone graft, thus favouring high quality fusion.
  • The lateral opening of the implants optimises the vertebral end-plates freshening area thus favouring a large, single fusion chamber.
  • The fusion of the graft will be all the more satisfactory, if it is mechanically stimulated.

Free bone contact within a single fusion chamber

  • Free contact between the grafts within the open implants allows a "one-and-only" fusion block. 
  • The role of the implant-graft package is to enable vascularisation from one vertebral end-plate to the other over the largest possible grafting area.

Stability and anatomy

A peripheral support area outside the grafting area

  • Restoring the intersomatic space height facilitates the opening of the foramen and makes it possible to obtain a radicular decompression.
  • The ROI implant makes it possible to recreate an intervertebral space close to anatomy whilst respecting the grafting area and resting as close as possible to the peripheral border of the vertebral end-plate.

Adjustment of desired lordosis thanks to difference in antero-posterior height of the implant

  • Restoration of desired lordosis is possible when placing an implant with a lordosing design.
  • The ROI range is available in three angulations (0°, 5°, 8°).
  • Implant's anterior and posterior heights determine the desired lordosis.

Maximum contact surface for optimal stability

  • Implants are shaped with a lateral opening allowing them to be thicker without reducing the grafting surface.
  • Weight-bearing of the ROI implant is therefore applied on a wide, strong and intact bone surface (close to the peripheral border of the vertebral end-plate).

Radio-transparency and safety

Transparency and consistency

  • The biocompatibility and mechanical qualities of PEEK are now widely recognised in intersomatic applications.
  • This material has an elasticity module close to that of bone, thus allowing the loading of the graft. There is also a biomechanical consistency between between two vertebral segments, the fusion of which can be assesed and controlled over time by radio-transparency.


  • ROI intersomatic cages are implanted according to a reproducible surgical technique which allows the progressive opening of the intersomatic space. As soon as they are placed, the serrated section of the implants ensures self-stability until the fusion is achieved. 

3D Animation

Product Brochure

Surgical Technique