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 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)

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. 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. Conversely, there is little increase in motion of the lumbar spine (2-4%) and

Bedrock Biomechanics⁶ Barrow Neurological Institute

SI Joint ROM

SI Joint ROM (Range of Motion) in degrees for Flexion-Extension, Lateral Bending, Axial Rotation and Compression. iFuse Bedrock stabilized the SI joint as measured by decreased ROM.

S2A1 Bending Movement

S2A1 Bending Movement. 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).

SI Joint ROM
	Intact	S1+ALIF	S2AI+ALIF	S2AI+ALIF+SAI(iFuse)
Flexion-Extension	1.55	1.70	0.70	0.47
Lateral Bending	0.27	0.39	0.17	0.12
Axial Rotation	0.44	0.46	0.35	0.33
Compression		0.95	0.70	0.50

S2A2 Bending Movement
	S2AI+ALIF	S2AI+ALIF+Bedrock
Flexion	0.33	0.11
Extension	0.49	0.14
Left Lateral Bending	0.33	0.14
Right Lateral Bending	0.30	0.13
Left Axial Rotation	0.31	0.29
Right Axial Rotation	0.38	0.33
Compression	0.92	0.39

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

Ivanov AA, et al. Spine 2009;34(5):E162-9.
Lindsey D, et al. Int J Spine Surg. 2015;9:64.
Joukar A, et al. JOR Spine. 2019;e1067. [Epub 2019 Oct 20].
A Torsional Rigidity of the iFuse Implant Compared with a SI Joint Screw in a Sawbones Model. SI-BONE Technical Study 300610-TS.
MacBarb RF, et al. Int J Spine Surg. 2017;11(3):16 [Part 2].
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.

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