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iFuse – Sacro-iliac Joint Fusion

“…up to 25% of all low back pain is related to sacroiliac joint conditions1.”

Diverse scientific studies show that up to 25% of all low back pain is sacroiliac joint in origin and that the diagnosis of sacroiliac joint disease is frequently overlooked by physicians.

Sacroiliac (SI) joint disorders require appropriate interpretation of a patient’s history, clinical exam results, and imaging studies. Often hip pathology and lumbar pathology coexist with SI joint pathology. During physical examination, patients with SI joint disorders exhibit any/all of the following symptoms:

  • Lower back pain (below L5)
  • Lower extremity pain (numbness, tingling, weakness)
  • Unilateral leg instability (buckling, giving way)
  • Disturbed sitting patterns (unable to sit for long periods, on one side)


Reaction on provocative hip tests (Compression, Thigh Thrust, Distraction, Gaenslen and FABER manoeuvre)

Provocative tests followed by diagnostic intraarticular SIJ injections when indicated are recommended for confirmation of the SI joint as a pain generator

Pain reduction assessment:

  • ≥ 50% Positive
  • < 50% may have SIJ pain, but consider other pain sources

According to scientific data, it is common for pain from the SI joint to mimic disc or low back pain. To avoid unnecessary lumbar spine surgery, SI joint disorders should be strongly considered in low back pain diagnosis.

Watch the basics of the SI Joint Exam

What is iFuse?

The iFuse Implant System is an innovative, patented, minimally invasive sacroiliac implant system to treat sacroiliac (SI) joint conditions including disruptions and degenerative sacroiliitis. The iFuse Implant System consists of titanium implants and associated surgical instruments.

Pelvis with ISG stabilizing iFuse Implants

How does iFuse work?

Typically, patients receive three triangular-shaped titanium implants. Available implant lengths range from 30mm to 70mm in 5mm increments. These implants are delivered to the sacroiliac (SI) joint using a cannulated delivery system designed to protect soft tissue. All this is performed through a 2-3cm incision.

Ideal indications:

The iFuse implant system is ideal for patients with sacroiliac joint conditions. These can appear chronically or due to an injury (e.g. consequently to accidents, post-natal back pain, high workload, etc.)

iFuse benefits

  • Triangular implant profile minimizes rotation
  • An interference fit between the implant and the adjacent osseous wall
  • The iFuse Implant offers a unique advantage for stabilizing and fusing the SI joint as a result of its patented triangular shape and large porous surface area. The triangular shape provides more than 31 times the rotational resistance of a screw which stabilizes the joint while the large porous surface area provides an ideal environment for bony on-growth to support long-term fusion. (see chart)
  • Porous surface technology used for decades in other medical applications such as orthopedics and dentistry
  • Designed specifically to stabilize and fuse the heavily loaded SI joint
  • Rigid titanium construction and implant geometry provide immediate stablilization
  • No conflicts with lumbar fusion devices

1 Diagnosis and treatment of sacroiliac joint pain Jonathan N. Sembrano, Mark A. Reiley, David W. Polly, Jr and Steven R. Garfin, Current Orthopaedic Practice Cohen, Steven P. Sacroiliac Joint Pain: A Comprehensive Review of Anatomy, Diagnosis, and Treatment.
Anesth Analg 2005; 101:1440-1453.