No-Profile® Anterior Lumbar Integrated Interbody System

STALIF MIDLINE® is part of an “integrated” system of implants and instruments designed to create consistent clinical results and avoid more destructive multiple incision surgeries.


Efficient Design ↓
No-Profile ↓
The Lag Effect ↓
Optimal Screw Trajectories ↓

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Efficient Design.
Fewer, Simpler Surgical Steps

STALIF MIDLINE® was designed to simplify surgery and reduce the number of surgical steps required.

No Supplemental Fixation

STALIF MIDLINE's integrated cage and screw system is cleared for use without supplemental fixation. Some surgeons, however, may still choose to use plates or pedicle screws.

3 Screw Construct

MIDLINE screws are 6.0mm in diameter and include our ABO™ (Anti Back-Out™) feature. Our three screw construct is proven to be biomechanically equivalent to the four screw STALIF TT device.1
1 Cappuccino A, MD, SAS 11, Las Vegas, NV April 2011.

Ease of Implantation

Through the co-functioning and coordination of our device and instruments, implantation is significantly eased.

The Lag Effect

Lag screws reduce the vertebral bodies onto the PEEK Cage creating graft / endplate surface compression to provide the best opportunity for fusion.

Discover More About The Lag Effect ►

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Conforms to Patient Anatomy

The STALIF MIDLINE® "No-Profile" design allows it to nest fully within the confines of the vertebral body, leaving the anatomy unchanged external to the interbody.
Above: A plate sits outside the confines of the vertebral body.
Above: STALIF MIDLINE conforms to the patient's anatomy.

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The Lag Effect.
Compressive Fixation Ensures Graft and Endplate Contact

As the preferred design to ensure fixation in cancellous vertebral bone, cancellous screws—combined with our screw head design—produce a lag effect between the vertebral body and the implanted device.

The lag effect provides constant compressive forces against the implant which results in a greater interface between the graft and the endplate to facilitate the fusion process.

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Optimal Screw Trajectories.
Engineered to Maximize Opportunities for Fusion

The STALIF MIDLINE® 3-screw design utilizes a midline convergence pattern in conjunction with an optimal horizontal inclination. These integrated elements conform to AO principles of fracture fixation, increasing the possibility of a fusion2.
2 Thalgott J, MD; Malone M - Principles of Interbody Fixation, White Paper, Centinel Spine Journal, Number 1 2009

Horizontal Inclination

STALIF MIDLINE® screws are angled and biomechanically designed to direct axial forces along the long axis of the screws—significantly reducing bending moments and preventing de-rotation of the screw and / or screw back- out.

Midline Convergence

Centinel’s converging screw design and angles are biomechanically more resistant to screw backout compared to parallel screws.3 Additionally, midline convergence angles are designed to provide a more secure interbody construct.
3 Cappuccino A, MD, SAS 11, Las Vegas, NV April 2011.

For ordering information, please contact us at (484) 887-8810 or

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Hear from a STALIF Patient:

Without a doubt I would recommend the surgery that I had because I have my life back.

- Renee, TX