iFuse Bedrock™ | SI-BONE
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iFuse Bedrock Logo


  • 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 trabecular surface enhances osteointegration. 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 includes spinopelvic fixation.
  • 30% reduction in SI joint motion by adding iFuse Bedrock to sacral-alar iliac (S2AI) screws. 3
Image Courtesy of Dr. Clifford Douglas (Lorna Linda, CA)
Image Courtesy of Dr. Clifford Douglas (Lorna Linda, CA)

Sacropelvic Fixation Considerations in Deformity Surgery

Learn More About the iFuse Procedure in Adult Deformity Utilizing the Bedrock Technique Featuring David W. Polly Jr. MD
  • Overview of the Bedrock technique with iFuse
  • Bedrock biomechanical study results
  • Surgical technique video
  • Applications for adult spinal deformity


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 Biomechanics* Barrow Neurological Institute

SI Joint ROM chart
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.

Bedrock Thumnail


  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. The Biomechanical Effects of a Novel Posteriorly Placed SI Joint Fusion Device Integrated with Traditional Lumbo-Pelvic Long Construct Instrumentation. SI-BONE Technical Study 300720-TS.

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

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iFuse: The Shape of Relief

Minimally invasive SI joint surgery is the current medical standard of care for SI joint fusion to relieve sacroiliac joint pain.

  • Clinically proven to reduce pain
  • Minimally invasive
  • Triangle shape minimizes rotation

Remember, there are potential risks associated with any surgery, including the iFuse Implant System. It may not be appropriate for all patients and not all patients may benefit.

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