iFuse Bedrock™ | SI-BONE



  • Rigid titanium construction and triangular implant geometry provide immediate stabilization.
  • Unique design provides interference fit between the implant and the surrounding bone (cortical and cancellous bone).
  • 6X greater rotational resistance vs. screw. 4


  • 3D printed implant with porous surface facilitates bone ongrowth. 5
  • Fenestrated structure allows through growth and accommodates bone graft. 5
  • Porous surface self harvests bone during insertion. 5


  • Immobilization and stabilization of the sacroiliac joint (SIJ) provides a foundation for long constructs that include spinopelvic fixation.
  • 30% reduction in SI joint motion by adding iFuse Bedrock to sacral-alar iliac (S2AI) screws. 6
Image Courtesy of Dr. Clifford Douglas (Loma Linda, CA)
Image Courtesy of Dr. Clifford Douglas (Loma Linda, CA)


iFuse Bedrock™ - Fixation. Fusion. Foundation

Are you building a strong foundation? Learn about the iFuse Bedrock procedure intended to fuse the SI joint in long construct cases.

More Levels. More Stress.

A 2009 paper published in Spine by Ivanov showed fusing the L5-S1 and L4-S1 increased the motion (stress) of the sacroiliac joint by 52% and 168%, respectively.1

Conversely, there is little increase in motion of the lumbar spine (2-4%)2 and little increase in hip stress (5%)3 after fusing the sacroiliac joint.

Joint mechanics 4

Bedrock Biomechanics6 Barrow Neurological Institute

SI Joint ROM

SI Joint ROM chart

S2A1 Bending Movement

S2A1 Bending Moment chart



  • iFuse Bedrock stabilized the SI joint as measured by decreased ROM
  • S2AI and S2AI with iFuse Bedrock decreased the bending moments on the S1 screw (reduced S1 screw stresses)
  • iFuse Bedrock decreased the bending moments on the S2AI screw (reduced S2AI screw stresses)


Bedrock Technique with iFuse-3D

Dr. Eastlack demonstrates the Bedrock technique using iFuse-3D implants.


  1. Ivanov AA, et al. Spine 2009;34(5):E162-9.
  2. Lindsey D, et al. Int J Spine Surg. 2015;9:64.
  3. Joukar A, et al. JOR Spine. 2019;e1067. [Epub 2019 Oct 20].
  4. A Torsional Rigidity of the iFuse Implant Compared with a SI Joint Screw in a Sawbones Model. SI-BONE Technical Study 300610-TS.
  5. MacBarb RF, et al. Int J Spine Surg. 2017;11(3):16 [Part 2].
  6. de Andrada Pereira B, et al. Biomechanical effects of a novel posteriorly placed sacroiliac joint fusion device integrated with traditional lumbopelvic long-construct instrumentation. J Neurosurg Spine. 2021 Jun 18:1-10. doi: 10.3171/2020.11.SPINE201540. Epub ahead of print. PMID: 34144523.

 For indications, safety, and risk information about the iFuse Implant System, click here.


SI Joint and iFuse Implant System Training

SI-BONE offers training on SI joint diagnosis and treatment for healthcare providers. Learn more about SI joint training opportunities.

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