iFuse Bedrock™ | SI-BONE

Deformity

Fixation

  • 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

Fusion

  • 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

Foundation

  • 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)

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 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) 

References

  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, Lehrman, Newcomb, Lindsey, Yerby, Godzik, Waguespack, Uribe, Kelly. The Biomechanical Effects of a Novel Posteriorly Placed SI Joint Fusion Device Integrated with Traditional Lumbo-Pelvic Long Construct Instrumentation. J Neurosurg Spine. (ACCEPTED 2020 Nov 24) Publication Pending.

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