Lumbar Spine
Interspinous Device Placement
A small titanium implant placed between the spinous processes after decompression — adding stability while preserving motion, without a fusion.
What it is
An interspinous (interlaminar) device is a small titanium implant seated between the bony projections at the back of two adjacent vertebrae, placed through the same midline incision used for the decompression. Its wings grip the spinous processes; the implant limits extension — the position that narrows the canal — while allowing the segment to keep moving.
It occupies a deliberate middle ground: more support than a decompression alone, far less surgery than a fusion. No screws enter the vertebrae, no disc is removed, and no bone is asked to heal together.
Why this procedure when surgery is needed
For lumbar stenosis with a mild, stable slip — or simply a level we would rather support than fuse — an interspinous device stabilizes the segment in the position that keeps the canal open. Patients whose symptoms ease when they sit or lean forward are describing exactly the mechanics the implant reproduces.
The honest framing: this is an option for a selected group of patients, not a universal alternative to fusion. When real instability is present, a fusion remains the more durable answer — and we will say so. But for the right anatomy, the device offers a shorter operation, a faster recovery, and preserved motion, and it does not burn any bridges: a fusion remains possible later if ever needed.
What to expect
Surgery typically takes 60–90 minutes including the decompression.
Most patients go home the same day or after one night.
Walking the day of surgery is encouraged and expected.
Return to desk work in 1–2 weeks; driving when off narcotics.
Activity restrictions are lighter and shorter than after a fusion — typically 4–6 weeks of avoiding heavy lifting and extremes of bending.
No fusion has to mature, so there is no months-long wait for bone to heal.
Risks and how we reduce them
The device adds little to the risk of the decompression itself, but an implant that grips bone has failure modes of its own — here is what can happen and how patient selection reduces it.
Expected, temporary effects
Incisional and back soreness. Soreness at the midline incision and surrounding muscles for the first weeks, similar to a decompression alone.
Awareness of the implant. Some patients notice a sense of midline firmness or pressure early on, which typically fades as the tissues settle.
Serious risks
Spinous process fracture. The bone the implant grips can crack, at surgery or afterward — particularly in osteoporotic bone, which is why bone quality is part of patient selection. A fracture can loosen the device and may change the plan.
Device migration or loosening. The implant can shift or lose its grip over time, occasionally requiring removal. Removal is straightforward, and a fusion remains available if the level still needs support.
Recurrent or persistent symptoms. Stenosis can recur or the segment can degenerate further, and some patients ultimately need a fusion. The device does not preclude that later operation.
Dural tear (CSF leak). A risk of the decompression portion of the operation; a tear is repaired at the time of surgery.
Infection. Wound or deeper infection is uncommon; an infected implant sometimes requires removal.
Prepare and recover
Handouts that fit this surgery. These are being finalized in physician review — visit the patient education library to see what is available, and always follow your own surgeon's specific protocol.
Prepare for this surgery
Recover from this surgery
Approach
- Posterior midline approach through a single small incision
- Standard microscope-assisted decompression performed first
- Implant sized and seated between the spinous processes under fluoroscopy
- Midline ligament and bone preserved to seat the device securely
- Outpatient-pathway pain control and early mobilization
Typical indications
- Lumbar spinal stenosis with symptoms relieved by sitting or leaning forward
- Mild, stable (low-grade) spondylolisthesis at the affected level
- A level judged to benefit from support without the trade-offs of fusion
- Failed appropriate conservative care
- Adequate spinous process bone quality to seat the implant
Alternatives we considered
- Decompression alone (laminectomy or laminotomy) when the segment is stable
- Lumbar fusion (TLIF/PLIF) when true instability or a mobile slip is present
- Continued conservative care for mild or stable symptoms
- Epidural steroid injection for acute flares
Related conditions
This procedure is most often performed for:
Medical review in progress. Author: practice editorial team.
The information on this page is general patient education and is not a substitute for individualized medical advice. For urgent symptoms, call 911 or go to the nearest emergency department. For non-urgent questions, call (785) 368-0767 during clinic hours.
Not sure whether a symptom needs a call? When to call after surgery