Thoracic Discectomy

A thoracic disc can herniate and press on the spinal cord, causing myelopathy — problems with walking, balance and function below the level of compression — or, less commonly, press on a nerve and cause band-like pain around the chest or trunk. Many small thoracic disc herniations cause few symptoms and need no surgery. Where a herniation is significantly compressing the cord or causing progressive symptoms, removing it can be considered. A particular challenge is that some thoracic discs become calcified and hard, which influences how they are approached.

The key principle in thoracic discectomy is to remove the disc without retracting or disturbing the spinal cord, which does not tolerate being pushed aside. For this reason, discs that lie centrally or are calcified are usually approached from the front or the side — for example through the chest (transthoracic), or via lateral routes — so the disc can be taken away in front of the cord. Discs lying more to the side may be reached through a posterolateral route such as a transpedicular approach or costotransversectomy. Minimally invasive and thoracoscopic techniques are also used in suitable cases. Where significant bone is removed or the segment is destabilised, a fusion may be added.

Thoracic discectomy can be considered where a disc herniation is significantly compressing the spinal cord, causing myelopathy or progressive neurological symptoms, or where nerve compression causes disabling pain that has not settled. The choice of approach depends heavily on where the disc sits (central versus lateral), whether it is soft or calcified, and the individual's anatomy and health. Because thoracic disc surgery carries particular risks, careful selection and planning are central, and small, asymptomatic herniations are generally managed without surgery.

The evidence emphasises the importance of approach selection. Systematic reviews comparing anterior with posterior approaches to thoracic disc herniation, and large registry analyses, suggest that carefully chosen approaches — particularly avoiding any retraction of the cord for central and calcified discs — are associated with lower neurological risk, while different routes suit different herniations. The literature reflects a specialised, evolving field with a move towards less invasive techniques where appropriate. The balanced view is that thoracic discectomy is effective for significant cord or nerve compression, provided the approach is matched carefully to the individual disc.

The operation is performed under general anaesthetic, and the hospital stay and recovery depend on the approach used — a minimally invasive route may allow quicker recovery, while a transthoracic approach is more involved. The main aim is to relieve pressure on the cord or nerve; neurological recovery, where the cord was compressed, typically occurs gradually over months. Rehabilitation supports recovery. As with any operation there are risks, which are discussed fully beforehand, and thoracic disc surgery is planned meticulously given its particular demands. The best approach for a given person is decided together.

• —Hurley ET, et al. Anterior versus posterior thoracic discectomy: a systematic review. Spine 2017. (PMID 28422798)
• —Mitre LP, et al. Anterior versus posterior approaches in thoracic discectomies: an updated systematic review and meta-analysis. Neurosurg Rev 2025. (PMID 40272599)
• —Elder BD, et al. Lower neurological risk with anterior operations compared to posterior operations for thoracic disc herniations: analysis of 697 patients. World Neurosurg 2021. (PMID 34381003)
• —Cannarsa G, et al. Evolution of thoracic disc herniation surgery: future perspectives from a systematic review and meta-analysis. Brain Sci 2024. (PMID 39595825)