No-Profile® Anterior Lumbar Integrated Interbody System

MIDLINE II™ is Centinel Spine’s next-generation Integrated Interbody™ anterior lumbar device, based on the successful design rationale of the STALIF MIDLINE® device.


Medial Screw Placement ↓
Large Graft Area ↓
Optimal Configuration ↓
STALIF® Technology ↓

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Medial Screw Placement.
Provides Easier Access to Screw Holes

MIDLINE II™ features a medial screw placement which results in a 17% reduction of the overall surgical envelope as compared to STALIF MIDLINE®—ultimately providing for decreased tissue retraction.*
*Comparisons based on measurements from CAD drawings demonstrating MIDLINE II™ compared to STALIF MIDLINE®

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Large Graft Area.
Greater Graft Area Than the Competition

With an open center to promote fusion throughout, the MIDLINE II™ graft containment area represents a 70% increase over STALIF MIDLINE® *
*Comparisons based on measurements from CAD drawings demonstrating MIDLINE II™ compared to STALIF MIDLINE®

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Greater A/P Depth

The MIDLINE II™ Anterior/Posterior Depth has been increased as compared to the STALIF MIDLINE® device.
Optimal Configuration.
Engineered to Maximize Opportunities for Fusion

MIDLINE II™ was designed with an increased anterior/posterior depth to achieve greater indirect decompression while concurrently sitting on the apophyseal ring. In addition, Centinel Spine provides surgeons with the largest number of implant size offerings in the industry—ensuring patients are receiving the best anatomical fit possible.

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STALIF® Technology.
A Member of the Revolutionary STALIF® Family

As a STALIF® Family product, MIDLINE II™ represents the “Gold Standard” in Stand-Alone, No-Profile® Integrated Interbody™ Technology. Based on AO principles of fracture fixation, STALIF® promotes compressive lag fixation that ensures biomechanical stability and secure graft-endplate contact consistent with Wolff’s law of bone remodeling.
Above: A plate sits outside the confines of the vertebral body.
Above: MIDLINE II™ conforms to the patient's anatomy.


The MIDLINE II™ "No-Profile" design allows it to nest fully within the confines of the vertebral body, leaving the anatomy unchanged external to the interbody.

Horizontal Inclination

MIDLINE II™ 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.

The Lag Effect

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.

Anti Back-Out® Screws

Our cancellous screws are designed with an Anti Back-Out® (ABO®) retention feature—utilizing a titanium split-ring for an added layer of security.

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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