Thoracic spine surgery is more demanding than most neck or lower back surgery, and it does carry real risks. How dangerous it is for you depends far more on why the operation is being done, and how, than on the fact that it is in the middle of your back. For the conditions that genuinely need it, such as a spinal cord that is being squeezed, an unstable fracture or a tumor, leaving the problem alone is often the bigger danger.
If a surgeon has just told you your mid back may need an operation, this guide explains what makes this part of the spine different, which risks are worth asking about, and how to tell whether surgery is the right call for your situation.
Quick answer: is thoracic spine surgery dangerous?
It is riskier than the average spine operation, but the most serious outcomes are uncommon. For surgery on thoracic disc herniations, a 2019 review that pooled 15 studies and about 1,000 patients found that up to about 29 percent of patients had a complication of some kind, most often a general medical problem such as pneumonia or a problem with the wound. Paralysis and death are the complications people fear most, and both are rare. That same review recorded three deaths among those patients.
Three things decide most of your personal risk: the condition being treated, the surgical approach, and your own health going in. A good surgeon will talk you through all three before you agree to anything.
Why the thoracic spine is different
Your thoracic spine is the twelve vertebrae of your mid back, between your neck and your lower back. Three features make surgery here harder.
Less room around the spinal cord
In the thoracic spine the spinal cord is large for the canal it runs through. The cord measures roughly 6.5 by 8 millimeters inside a canal of roughly 17 millimeters, which leaves little free space. The natural rounded curve of the mid back also pushes the cord forward, against the front of the canal where the discs sit, and small ligaments hold it in place, which limits how much it can move. In practice that means a surgeon has very little room to work around the cord.
A more fragile blood supply
Parts of the thoracic spinal cord sit in what doctors call watershed zones, areas at the far edge of their blood supply. They are more sensitive to a drop in blood flow than other parts of the cord, which is one reason surgeons plan thoracic operations so carefully.
Ribs, lungs and major blood vessels
Every thoracic vertebra connects to a pair of ribs, and the lungs, heart and major blood vessels sit directly in front of the spine. Reaching the front of a thoracic vertebra means going through or alongside the chest, which is why lung problems such as pneumonia show up among the risks of those approaches.
The real risks to ask about
These are the complications worth raising with your surgeon. Not every one applies to every operation.
- Spinal cord or nerve injury. The most serious risk, and the reason thoracic surgery is planned so carefully. Permanent weakness or paralysis is rare.
- Spinal fluid leak. A tear in the dura, the protective sac around the cord, can let spinal fluid leak. It is more likely when a disc has hardened with calcium and is stuck to the dura.
- Lung and chest problems. Pneumonia, fluid around the lung, or a blood clot traveling to the lungs, mainly with approaches through the chest.
- Blood clots, infection and bleeding. Risks shared with most major surgery.
- Hardware problems. When screws and rods are used to stabilize the spine, the screws can loosen, especially in weaker bone, or the bones may not fuse as planned.
- Operating at the wrong level. The mid back has twelve similar vertebrae, and rib and vertebra variations can make counting them on imaging harder. It is rare overall, reported at 0.09 to 4.5 per 10,000 spine surgeries, and in one survey of spine surgeons covering 418 wrong-level procedures, 8 percent were in the thoracic spine. Ask how your surgeon confirms the level during the operation.
Why your risk depends on the reason for surgery
Thoracic spine surgery is not one operation. At Mountain Spine & Orthopedics, thoracic spine surgery is considered for spinal cord compression, unstable fractures, thoracic disc herniation, spinal tumors, infection, and progressive deformity such as kyphosis. Each one carries a different balance of risk and benefit.
Spinal cord compression (thoracic myelopathy)
When something presses on the cord, the goal of surgery, usually a decompression that removes the bone or tissue pressing on it, is to stop the damage from getting worse. Cord damage that is left to progress may not fully recover, so for this condition the risk of waiting is part of the calculation.
Fractures
Many thoracic fractures heal without surgery. An unstable fracture, where the spine can shift, may need to be stabilized with screws and rods to protect the cord. If you have a compression fracture, it is worth knowing that most are treated without an open operation.
Thoracic disc herniation
Thoracic disc herniations are uncommon, between 0.1 and 5 percent of reported disc herniations, and many are found by chance on an MRI and never need treatment. Surgery is usually reserved for discs pressing on the cord. Surgeons largely stopped removing thoracic discs through a simple laminectomy from the back, because it led to high rates of nerve damage. Modern approaches reach the disc from an angle, from the side, or from the front through the chest instead. Hard, calcified discs and very large central discs are the most technically demanding.
Tumors and infection
Surgery for a spinal tumor or an infection such as an epidural abscess is often about protecting the cord and stabilizing the spine. These cases usually carry more risk, because the underlying illness is serious in its own right.
The approach matters as much as the operation
A thoracic spine can be reached from the back, from the side, or from the front through the chest. In the medical literature, approaches from the back at an angle have shown lower complication rates than approaches from the front or the side. Approaches from the front through the chest, in particular, carry more lung problems, blood clots and spinal fluid complications. The front approach is still the right choice for some problems, so the question is whether it is right for yours.
Less invasive techniques, including keyhole approaches through small openings in the chest wall and endoscopic surgery, have been developed to reduce these complications in suitable cases. They are not right for every condition, but it is a fair question to ask.
Some thoracic operations also include a fusion, where two or more vertebrae are joined so they heal into one solid bone, often with screws and rods holding them still while the bone heals. Not every thoracic surgery needs one.
What makes your own risk higher or lower
Your health going into surgery matters. Factors that raise the difficulty or the risk include:
- Weak bones. Low bone density makes screws harder to hold. Our guide to spine surgery with osteoporosis explains what that means for you.
- Previous surgery at the same level, which leaves scar tissue.
- Significant excess weight.
- Smoking, which slows bone healing after a fusion.
- Other conditions such as heart or lung disease, which affect how well you tolerate a long anesthetic.
Some of these can be improved before an operation that is not urgent. Ask your surgeon which ones apply to you and whether waiting to address them is safe.
What recovery looks like
Recovery varies widely with the procedure, the approach and the reason for surgery. As a general guide for major thoracic procedures, a hospital stay of 3 to 7 days is common, walking usually starts soon after surgery, a return to light activities takes about 6 to 12 weeks, and full recovery can take 6 to 12 months.
If your operation includes a fusion, our spinal fusion recovery timeline walks through each stage, from the first days after surgery to the first year.
When not having surgery is the bigger danger
For some thoracic problems, the operation is how you avoid permanent damage. See a doctor promptly, or go to an emergency room, if you notice:
- Weakness, stiffness or clumsiness in your legs, or new trouble walking or keeping your balance
- Numbness in your legs, or a band of numbness around your chest or stomach
- New problems controlling your bladder or bowels
- Mid back pain with fever, unexplained weight loss, or a history of cancer
These can be signs that the spinal cord is under pressure or that something serious is going on, and they should not wait for a routine appointment.
Questions to ask your surgeon
- What exactly is the problem, and what happens if I do not have surgery?
- Which approach will you use, and why that one for me?
- Will I need a fusion?
- Is a less invasive technique an option in my case?
- Which complications are most likely for me specifically?
- How will you confirm the correct level during the operation?
- How long will I be in hospital, and when can I go back to work?
If the answers leave you unsure, a second opinion is a normal part of deciding on spine surgery, not a sign of distrust. Our article on getting a second opinion from an orthopedic doctor covers how to go about it.
Getting your scans looked at
If you already have an MRI and a recommendation for thoracic surgery, you can send your images for a free MRI review or request a second opinion from the orthopedic and spine team at Mountain Spine & Orthopedics, with locations in Florida, New Jersey, New York and Pennsylvania. We will look at what your scans show and talk you through your options, surgical and non-surgical, before you decide anything.
Frequently Asked Questions
Answers to the most common patient questions about this topic.
How common is thoracic spine surgery?
It is much less common than surgery on the neck or lower back. Thoracic disc herniations, for example, make up only about 0.1 to 5 percent of reported disc herniations, and many never need treatment. Thoracic surgery is mostly reserved for spinal cord compression, unstable fractures, tumors, infection and progressive deformity.
Can thoracic spine surgery cause paralysis?
It can, but it is rare. The thoracic spinal cord has little room around it and a more fragile blood supply than other parts of the cord, which is why surgeons plan these operations carefully. For some conditions, such as a cord that is already being compressed, not operating carries its own risk of permanent damage.
How long does it take to recover from thoracic spine surgery?
It depends on the procedure. As a general guide for major thoracic operations, a hospital stay of 3 to 7 days is common, walking usually starts soon after surgery, light activities resume in about 6 to 12 weeks, and full recovery can take 6 to 12 months.
Does thoracic spine surgery always involve a fusion?
No. Some operations only remove what is pressing on the spinal cord or nerves. A fusion, which joins vertebrae so they heal into one solid bone, often with screws and rods holding them still, is added when the spine needs to be stabilized, for example after an unstable fracture or when a large amount of bone has to be removed.
Why are calcified thoracic discs harder to operate on?
A disc that has hardened with calcium can stick to the dura, the protective sac around the spinal cord. Separating the two is difficult and raises the chance of a tear and a spinal fluid leak, so these discs are among the most technically demanding thoracic operations.
Is it worth getting a second opinion before thoracic spine surgery?
Often, yes, when the surgery is not an emergency. Thoracic operations are uncommon and vary a great deal by approach, so hearing a second surgeon's view of your scans and options can help you decide with confidence.
