Minimally Invasive Instrumented Spondylolisthesis Surgery (Mini-TLIF)

Minimally invasive spondylolisthesis surgery (Mini-TLIF) stabilises slipped vertebrae by placing screws and a cage through an approximately 3 cm incision without extensive muscle stripping. Fusion and reoperation rates are the same as with open surgery, while blood loss, infection and hospital stay are lower. The operation takes an average of 2–2.5 hours, and patients generally get up the same day.

What Is Minimally Invasive Spondylolisthesis Surgery, and How Is It Performed?

Open surgery is an established approach used for many years. As minimally invasive techniques have developed, methods allowing fusion through smaller surgical corridors have become more common in suitable patients. Today, as with lumbar disc surgery, spondylolisthesis surgery can be performed successfully using percutaneous methods. With the technique called minimally invasive TLIF (Mini-TLIF):

• Blood loss is lower,
• A skin incision of approximately 3 cm is sufficient,
• Surrounding muscles and soft tissues are disturbed less,
• Less bone is removed to create the necessary corridor.

Surgical Procedure and Stages

The operation is performed under general anaesthesia in a fully equipped operating theatre, guided by advanced imaging technology:

• Access and Tissue Preservation: Entry is through an approximately 3 cm skin incision. Unlike the conventional open approach, muscles are not extensively stripped; bone is reached through the natural plane (fascia) between muscle fibres.
• Disc Removal and Cage Placement: After a very small amount of bone is removed, the disc material is cleared and the disc space prepared for fusion. A TLIF cage is placed in this space to maintain disc height, together with bone graft to enable the two vertebrae to unite.
• Percutaneous Screw Placement: Finally, the screws and rods that stabilise the spine are placed on both sides through small skin incisions under fluoroscopic guidance.

Recovery Time and Advantages

• Operating Time: An average of 2–2.5 hours.
• Hospital Stay: Our patients get up and walk on the day of surgery; the hospital stay is generally 1 day.
• Recovery: Limited tissue damage means less early postoperative pain and earlier movement.

What Is the Success Rate of Minimally Invasive Instrumented Spondylolisthesis Surgery?

Fusion rates and the need for repeat surgery are the same as with open surgery [2]; long-term improvements in pain and daily functioning are also equal [2, 3]. Lower back pain and daily limitations were slightly lower with the minimally invasive method [4]. Hospital stay is approximately 2 days shorter [2].

What Are the Risks of Mini-TLIF?

Overall complications are 25% lower than with open surgery; surgical-site infection falls to approximately one-third (1.2% versus 4.6%), and blood loss is markedly reduced [2, 4]. However, fluoroscopic guidance means longer radiation exposure, and the technique requires more experience than open surgery [1, 3].

🩺 Physician’s Insight & Clinical Experience

“We see the greatest comfort that microsurgery and minimally invasive methods have brought to neurosurgery in spondylolisthesis operations. However, I can use this operation in my patients with one-level or, at most, two-level slippage. In open operations, stripping muscles from bone used to cause prolonged postoperative lower back pain. With Mini-TLIF, we pass between the muscles instead. Because tissues remain in their original anatomy, our patients can walk along the corridor the same day, almost without feeling they have undergone surgery. Combining technology and experience markedly improves patient comfort.”

Frequently Asked Questions

What Is Minimally Invasive Instrumented Spondylolisthesis Surgery (Mini-TLIF)?

Mini-TLIF stabilises slipped vertebrae by placing screws and a cage percutaneously through an approximately 3 cm incision without stripping muscles.

What Is Its Success Rate?

Fusion and reoperation rates are the same as with open surgery, as are long-term improvements in pain and daily functioning [2, 3].

Can Every Spondylolisthesis Be Operated on with Mini-TLIF?

No. The minimally invasive method is used for one-level or, at most, two-level slippage. Multilevel slips, advanced spinal curvature or dense adhesions from previous surgery require open surgery.

Does It Have Risks or Side Effects?

Yes, but they are lower than with open surgery: there is less blood loss and infection [1, 2, 4]. Conversely, fluoroscopy leads to longer radiation exposure, and the technique requires more experience [1, 3].

Will My Body Recognise the Screws as Foreign and Reject Them?

No, titanium screws are biocompatible; tissue rejection like that after an organ transplant does not occur. True metal sensitivity is very rare.

Will the Screws Prevent an MRI for Another Condition?

You can have an MRI: the titanium screws used are MRI-compatible. Image quality is only slightly affected in the region containing the screws.

What Material Are the Screws Made of?

Titanium alloy (titanium–aluminium–vanadium), a lightweight, durable and biocompatible material.

Can the Screws Bend, Break or Become Displaced?

Usually not. Once fusion has occurred, bone carries a substantial part of the load. Screw loosening is rare but may occur with excess weight, uncontrolled movements or delayed fusion related to smoking.

Do the Screws Have a Limited Lifespan or Need Replacing Later?

No, these screws have no expiry date. Once bone fusion is achieved, they can remain in the body for life and need not be removed unless they cause a problem.

Will the Implants Trigger Airport or Shopping-Centre Security Gates?

Titanium screws often do not trigger conventional metal detectors, although implants may be detected by body scanners. If an alarm sounds, showing your operation report makes additional checks easier.

When Will My Sexual Life Return to Normal?

Usually, a gradual return is possible 4–6 weeks after surgery once tissue healing is complete.

How Long Must I Wear a Brace?

I generally prescribe a brace for 4–6 weeks after surgery to support bone fusion. It is then gradually discontinued to strengthen the back muscles. Brace use may vary according to the surgeon’s preference.

Which Specialist Performs Minimally Invasive Instrumented Spondylolisthesis Surgery in Istanbul?

One of the physicians performing this operation in Istanbul is M. Levent Deniz, MD, a specialist in brain, nerve and spine surgery.

How Much Does Instrumented Spondylolisthesis Surgery Cost?

As treatment costs vary according to the patient and hospital conditions, a definite fee can only be determined after examination and review of imaging.

References

1. Jagtiani P, Karabacak M, Margetis K. Comparative Effectiveness of Open Versus Minimally Invasive Transforaminal Lumbar Interbody Fusion: An Umbrella Review of Meta-Analyses. Clin Spine Surg. 2024. PMID: 38245811.
2. Patel S, Nischal SA, White GW, et al. Minimally invasive versus open transforaminal lumbar interbody fusion for low grade lumbar spondylolisthesis: a systematic review and meta-analysis. Spine Deform. 2026 Jul 20. PMID: 42477285.
3. Hammad A, Wirries A, Ardeshiri A, Nikiforov O, Geiger F. Open versus minimally invasive TLIF: literature review and meta-analysis. J Orthop Surg Res. 2019;14(1):229. PMID: 31331364.
4. Phan K, Rao PJ, Kam AC, Mobbs RJ. Minimally invasive versus open transforaminal lumbar interbody fusion for treatment of degenerative lumbar disease: systematic review and meta-analysis. Eur Spine J. 2015;24(5):1017-1030. PMID: 25813010.

• 👨‍⚕️ Author and medical reviewer of this content: M. Levent Deniz, MD – Brain, Nerve and Spine Surgeon
• ⚠️ Medical Disclaimer: This page is for information only; consult your doctor for diagnosis and treatment.