TLIF

Most lower back and leg problems settle without an operation. When they don't, a TLIF can steady a slipping or worn part of your spine and take the pressure off your nerves. Most people walk within a day and go home in two to three days.

Reviewed by Dr. Kshitij Chaudhary. Last reviewed October 2026

What is a TLIF?

TLIF stands for transforaminal lumbar interbody fusion. It is an operation on the lower back that does two jobs. It frees the nerves that are being squeezed, and it joins two vertebrae so they stop moving against each other. The surgeon takes out the worn disc between the bones and puts a small spacer filled with bone graft in its place. Screws and rods hold the spine steady while the bones grow together.

Why would I need a fusion?

Some spines become unstable. A bone may slip forward, or a worn disc may let the joint move too much. This can pinch the nerves and cause leg pain, numbness or weakness, and sometimes back pain on top. Removing the pressure alone is not always enough, because a moving segment keeps irritating the nerve. Fusing it gives the nerves a steady base. The spacer also restores the height of a collapsed disc, which opens up room around the nerve.

The common reasons are:

• A slipped vertebra. Spondylolisthesis
• A narrowed canal with an unstable segment. Lumbar Spinal Stenosis
• A worn, collapsed disc that keeps causing pain. Degenerative Disc Disease
• A disc that has slipped again after earlier surgery. Lumbar Disc Herniation & Sciatica

Who needs this surgery?

Most people don't. Most lower back problems improve with time, medicines, physiotherapy and sometimes an injection. We try these first.

Surgery is worth discussing if:

• Your leg pain, numbness or weakness has not settled with proper non-surgical treatment
• Your scans show a slipped or unstable vertebra with nerves pressed at the same level as your symptoms
• Walking is limited because your legs become heavy or painful
• A previous disc operation has failed because the segment is unstable or the disc has come back

A few situations are urgent. These are sudden severe weakness, or new trouble passing urine or stools with numbness around the groin. Come to the hospital the same day if this happens.

If you've been told you need a fusion and want to be sure, you can send us your MRI for a second opinion →

Are there other options?

Yes, and we'll go through them with you. Depending on your scan and symptoms, the choices include:

• Carrying on with non-surgical care: physiotherapy, medicines, activity changes and sometimes an injection
• A decompression alone, with no fusion, if the spine is stable enough. Laminectomy →
• A fusion done through a different route, such as from the front or the side, if your scan suits that better

The right choice depends on which level is involved, how many levels, and what you want from treatment.

Will it help my back pain?

Fusion works best when your scan shows a real problem that matches your leg symptoms. Surgery for back pain alone is offered only in very select cases. If your pain is mostly in the back and your nerves are fine, we will usually tell you that surgery is not the answer.

How is the operation done?

1. You are under general anaesthesia, so you're asleep throughout.
2. You lie face down. The surgeon makes a cut in the lower back.
3. The muscles are moved aside to reach the spine.
4. A small part of the bone and joint on one side is removed. This opens a gap to the disc and gives the nerves room. The surgeon reaches the disc from the side of the canal, so the nerves are moved very little.
5. The worn disc is taken out. A spacer filled with bone graft goes into the disc space. This is what lets the two bones grow together.
6. Screws and rods are placed on both sides, with X-ray guidance, to hold the spine steady while the bone heals.
7. The cut is closed and covered with a dressing.

One level usually takes about 2 to 3 hours.

Should I have open or keyhole surgery?

A TLIF can be done through one longer cut (open) or through two small cuts using narrow tubes (keyhole). Keyhole disturbs less muscle, so there is usually less pain from the wound, less blood loss and an earlier return to walking. The work on the disc, nerves and bone is the same.

We do keyhole when it suits you. Open surgery is sometimes better, for example when the slip is severe, when several levels need fusing, or when this is a repeat operation. Read more: Minimally invasive TLIF →

How well does it work?

Most people get good relief from leg pain, often soon after surgery. Numbness and tingling can take weeks to months to settle. Back pain improves in many people, though not always completely. The aim is a steadier, more comfortable spine, not a new one.

What are the risks?

Every operation has risks, and we'll go through them with you before you decide. They include:

• Infection of the wound
• A small tear in the nerve covering, which usually heals with a short period of lying flat
• Pain or numbness that does not fully improve
• A screw or spacer that needs adjusting
• Bone that is slow to join
• Blood clots in the legs, which is why we get you walking early
• Wear in the discs above or below the fusion over many years, which sometimes needs more surgery

Serious nerve injury is rare. Not smoking lowers the chance that the bone will fail to join.

How long does the bone take to join?

The bone grows across the disc space slowly. Most fusions are solid by about 3 to 6 months, and X-rays at your follow-up visits show how it is going. The bone keeps maturing for up to a year. The screws and rods hold the spine steady until then.

What is recovery like?

You usually get up and walk within a day of surgery, and most people stay in hospital for two to three days. The back is sore for the first few weeks.

Stopping smoking helps the bone heal. Call us if you notice fever, a wound that is red or leaking, new weakness in the leg, or trouble passing urine.

Questions to ask your surgeon

• Does my scan match my symptoms?
• Have I tried enough non-surgical treatment?
• Do I need a fusion, or would a decompression alone be enough?
• How many levels need fusing, and is keyhole suitable for me?
• What result can I expect for my leg and for my back?
• When can I return to work and exercise?

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About Dr. Kshitij Chaudhary

This page was written by Dr. Kshitij Chaudhary, a fellowship-trained spine surgeon at P.D. Hinduja Hospital, Mumbai, trained in complex spine surgery at Harvard Medical School (Beth Israel Deaconess) and the Twin Cities Spine Center, Minneapolis. 🏃🏾About Dr. Chaudhary

This page is for general information. It doesn't replace advice from your own doctor.