Every year, hundreds of thousands of discectomies are performed to relieve the pain associated with a herniated disc. Every spine surgeon makes the same trade: relieve the pain, leave the annulus (the disc wall) open, and risk further degeneration and another herniation.
We are working to make that trade unnecessary.
People with low back pain worldwide
U.S. discectomies performed each year
Annual U.S. cost of revision surgery
Of discectomy procedures weaken or leave an opening in the annulus
Low back pain affected 619 million people globally in 2020 and is projected to reach 843 million by 2050. It is the single largest contributor to years lived with disability on Earth. In the United States alone, degenerative disc disease drives an estimated $90 billion in annual direct and indirect cost.
A large share of that burden begins as a mechanical failure. The annulus fibrosus — the tough, concentrically layered wall that contains the disc’s pressurized core — protrudes and possibly tears. The nucleus pulposus pushes into or through the breach and the herniation presses on the nerve root. The result is radiculopathy: leg pain, numbness, weakness, and for many patients the loss of the ability to work.
Back pain is the leading cause of disability. Lumbar disc herniation is often the cause of the pain.
The lumbar spine, sectioned at the disc. The axial view is used in illustrations on this page and shows the spinal cord, exiting nerve roots, annulus, and nucleus are shown.
Axial view of the spine at the intervertebral disc. The nucleus and annulus push out (herniate) posterolaterally, contacting the traversing nerve root.
Lumbar discectomy is performed several hundred thousand times a year in the United States. But the procedure is fundamentally subtractive. The surgeon removes the herniated material and then leaves that defect open.
What remains is a disc with a permanent breach in its containment structure, under physiological load, with no biological capacity to close.
Lumbar discectomy. The herniated fragment is surgically removed, leaving a weakened annulus.
The herniated material, including parts of the annulus and the nucleus, is surgically removed. The nerve root is decompressed and the leg pain resolves.
Nothing closes the wall. The disc is left carrying load with an opening it has no capacity to heal.
The annulus fibrosus contains the pressurized nucleus. Load is distributed evenly across an intact wall.
The wall weakens and expands or tears. Nucleus material extrudes into the defect or leaks out of the breach. The degeneration compresses the nerve root, producing radicular pain.
The fragment is gone and the nerve is free. The annular defect (circled) stays exactly as the procedure left it.
Published reherniation rates are up to 20%. At ten-year follow-up, recurrent disc herniation is the single most frequent reason for reoperation.
Patients left with an annular defect wider than 6 mm reherniate at approximately 27%.
Roughly $300,000 in revision surgery is spent for every 100 index lumbar discectomies. Across the U.S. health system this is conservatively estimated at $1.4 billion per year.
Recurrent herniation leads to repeat discectomy with measurably poorer outcomes, then to progressive degeneration, then to fusion. None of these steps restore normal disc function. Each one costs more than the last.
Axial view after discectomy. The fragment is gone and the nerve root is decompressed — but the annulus is left open (circled).
Unlike bone or skin, the annulus fibrosus is avascular and nearly acellular at its core. It has no meaningful capacity for self-repair. Once the wall is torn, the tear is permanent — and the disc continues to bear load through the defect for the rest of the patient’s life.
This is what turns a single acute event into a degenerative trajectory: reherniation, progressive height loss, and eventual fusion.
Discectomy and microdiscectomy are among the most commonly performed surgical procedures in the United States
— roughly 350,000 to 400,000 cases annually.
Discectomy is performed at a volume comparable to the largest orthopedic procedures in the United States.
Discectomies performed each year.
Reherniation rate following discectomy
Virtually every spine surgeon is trained on and performs discectomies.
Compound annual growth in procedure volume
Annular closure is not a subsegment of discectomy. It is coextensive with it. Every procedure creates the defect, so every procedure is a candidate for closing it.
A market defined that way is not won share by share. It is opened.
Baby boomers and Gen X are moving through the peak window for symptomatic disc degeneration. Procedure volume grows with the aging population, independent of any change in practice pattern.
Discectomy is shifting rapidly into ambulatory surgery centers, where facility economics strongly favor single-use, high-margin adjuncts that reduce revision risk. The site-of-service shift is a tailwind, not a threat.
A durable repair option creates a path to capture volume that today escalates into the 450,000-procedure fusion market — a far larger and more expensive pool of patients who perhaps never wanted a fusion in the first place.
Annular repair is not a subsegment play. Nearly every discectomy creates an annular defect, and nearly every annular defect is a candidate for closure. That makes the serviceable population coextensive with the procedure itself — a rare structural advantage in a mature surgical market.
THE ADDRESSABLE MARKET
In most device markets
the funnel narrows at every step
In annular closure, it does not.
Lumbar discectomies performed each year
Procedures that leave an annular defect
Procedures a closure device could address
AnnuNovo exists to address a specific, well-defined, unsolved problem: the annular defect left behind after lumbar discectomy.
Illustrative sequence. Axial view of the annular defect left by discectomy and the subsequent AnnuNovo solution.
The AnnuNovo device is not approved or cleared for sale. Information provided is for purposes of evaluation only.
Our approach is not a mechanical device, an anchor, or a mesh. It works with the body’s own repair machinery rather than against it.
It is designed to be delivered by the surgeon during the procedure already being performed — no new access, no new operation.
The underlying science has been under continuous preclinical development and peer review for more than ten years.
Detailed technical, preclinical, and regulatory information is available to qualified investors, surgeons, and strategic partners under confidentiality.
AnnuNovo’s clinical direction is being shaped by leading spine surgeons across academic medicine, high-volume private practice, and international centers of excellence. We will be naming the clinical advisors soon.
Academic Spine Center
High-Volume ASC Practice
Endoscopic Technique
Neurosurgery
International / EU
Health Economics
AnnuNovo is a privately held, development-stage company. We’re glad to connect with investors who follow spine, orthopedics, and regenerative medicine.
If you perform discectomy and have opinions about what the procedure leaves behind, we want to hear them. Advisory and early clinical involvement opportunities are open.
Distribution, licensing, and partnership conversations welcome — particularly for international markets.