Thoracic spine approaches

Thoracic spine approaches

Since the end of the nineteenth century, the wide dissemination of Pott’s disease has ignited debates about which should be the ideal route to perform ventrolateral decompression of the dorsal rachis in case of paraplegia due to spinal cord compression in tuberculosis spondylitis. It was immediately clear that the optimal approach should be the one minimizing the surgical manipulation on both neural and extra-neural structures, while optimizing the exposure and surgical maneuverability on the target area. The first attempt was reported by Victor Auguste Menard in 1894, who described, for the first time, a completely different route from traditional laminectomy, called costotransversectomy. The technique was conceived to drain tubercular paravertebral abscesses causing paraplegia without manipulating the spinal cord 1).

The procedure defined by Capener in 1954 2) resulted in better results for the treatment of spinal tuberculosis, due to the effect of antibiotic3)

Over the following decades many other routes have been described all over the world, thus demonstrating the wide interest on the topic. Surgical development has been marked by the new technical achievements and by instrumental/technological advancements, until the advent of portal surgery and endoscopy-assisted techniques. Gagliardi et al. retraced the milestones of this history up to 2022, through a systematic review on the topic 4).


Thoracic disc herniation surgery is challenging because of: the difficulty of anterior approaches, the proportionately tighter space between cord and canal compared to the cervical and lumbar regions, and the watershed blood supply which creates a significant risk of spinal cord injury with attempts to manipulate the cord when trying to work anteriorly to it from a posterior approach. Thoracic disc herniations are calcified in 65% of patients considered for surgery 5) (more difficult to remove from a posterior or lateral approach than non-calcified discs).

For centrally located anterior access: a transthoracic or lateral approach gives the best acess. Some prefer a left-sided approach to avoid the vena cava, others prefer a right-sided approach because the heart does not impede access.


Various different approaches have been tried for the surgical removal of TDH, but most of them are cumbersome surgeries such as thoracotomy or thoracoscopic or anterior approaches with or without instrumentation. The requirement for a simplified, familiar, and less morbid surgery has motivated some new approaches. A pedicle sparing transfacet approach (PSTA) was first described in 1995, but to date no sufficient clinical series has been presented in the literature to report on its feasibility and applicability along with complication and morbidity rates.

Surgery for thoracic disc herniation is comparatively rare and often demanding. The goal is to achieve sufficient decompression without manipulating the spinal cord. Individual planning and various surgical techniques and approaches are required.

Surgical treatment can be divided into anterior, lateral and posterior approaches and is an area of contention in the literature. Available evidence consists mostly of single-arm, single-institutional studies with limited sample sizes.

Anterior approaches had longer LOS and higher, although not statistically significant, complication rates. No difference was found with regard to discharge disposition. In light of these findings, surgeons should weigh the risks and benefits of each surgical technique during tailoring of decision making 6).

The approach is dependent on the location, the magnitude, and the consistency of the herniated thoracic disc.

Medially located large calcified discs should be operated through an anterolateral transthoracic approach, whereas noncalcified or lateral herniated discs can be treated from a posterior approach as well. For optimal treatment of this rare entity, the treatment should be performed in selected centers 7).

Anterolateral retroperitoneal, anterior transthoracic, posterolateral, and lateral approaches are performed in discectomy with or without fusion and internal fixation. However, patients who have undergone any operation at these levels are predisposed to postoperative recurrence, neurological aggravation, and adjacent segment degeneration, and the outcomes are inferior than those in lower lumbar spine 8) 9).


posterior (midline laminectomy): primary indication is for decompression of posteriorly situated intracanalicular pathology (e.g. metastatic tumor) especially over multiple levels. There is a high failure and complication rate when used for single-level anterior pathology (e.g. midline disc herniation)

a) lateral gutter: laminectomy plus removal of pedicle

b) transpedicular approach 10)

c) costotransversectomy

d) Pedicle sparing transfacet approach

(transthoracic approach): usually through the pleural space

(retrocoelomic) 11) : an approach posterior (external) to the pleural space

Video-assisted thoracoscopic surgery is an alternative to open surgical approaches 12) 13).


1)

Ménard V. Causes de la paraplégie dans le mal de Pott. Son traitement chirurgical par l’ouverture directe du foyer tuberculeux des vertebres. Rev Orthop 1894; 5: 47-64.
2)

CAPENER N. The evolution of lateral rhachotomy. J Bone Joint Surg Br. 1954 May;36-B(2):173-9. doi: 10.1302/0301-620X.36B2.173. PMID: 13163099.
3)

Benzel EC. Spine Surgery: Techniques, Complication Avoidance, and Management, 3th Ed. Saunders, Philadelphia 2012.
4)

Gagliardi F, Pompeo E, De Domenico P, Snider S, Roncelli F, Acerno S, Mortini P. HISTORY OF EVOLUTION OF POSTERO-LATERAL APPROACHES TO THE THORACIC SPINE: FROM CURE OF POTT’S DISEASE TO EPIDURAL TUMOR RESECTION. J Neurol Surg A Cent Eur Neurosurg. 2022 Jan 10. doi: 10.1055/a-1734-2085. Epub ahead of print. PMID: 35008121.
5) , 12)

Stillerman CB, Chen TC, Couldwell WT, et al. Experience in the surgical management of 82 symptomatic herniated thoracic discs and review of the literature. J Neurosurg. 1998; 88:623–633
6)

Kerezoudis P, Rajjoub KR, Goncalves S, Alvi MA, Elminawy M, Alamoudi A, Nassr A, Habermann EB, Bydon M. Anterior versus posterior approaches for thoracic disc herniation: Association with postoperative complications. Clin Neurol Neurosurg. 2018 Apr;167:17-23. doi: 10.1016/j.clineuro.2018.02.009. Epub 2018 Feb 6. PubMed PMID: 29428625.
7)

Arts MP, Bartels RH. Anterior or posterior approach of thoracic disc herniation? A comparative cohort of mini-transthoracic versus transpedicular discectomies. Spine J. 2013 Oct 24. pii: S1529-9430(13)01595-7. doi: 10.1016/j.spinee.2013.09.053. [Epub ahead of print] PubMed PMID: 24374099.
8)

Sanderson SP, Houten J, Errico T, et al. The unique characteristics of “upper” lumbar disc herniations. Neurosurgery 2004;55:385–9.
9)

Ido K, Shimizu K, Tada H, et al. Considerations for surgical treatment of patients with upper lumbar disc herniations. J Spinal Disord 1998;11:75–9.
10)

Le Roux PD, Haglund MM, Harris AB. Thoracic Disc Disease: Experience with the Transpedicular Approach in Twenty Consecutive Patients. Neurosurgery. 1993; 33:58–66
11)

Uribe JS, Smith WD, Pimenta L, et al. Minimally invasive lateral approach for symptomatic thoracic disc herniation: initial multicenter clinical experience. J Neurosurg Spine. 2012; 16:264–27
13)

Dohn DF. Thoracic Spinal Cord Decompression: Alternative Surgical Approaches and Basis of Choice. Clin Neurosurg. 1980; 27:611–623

3D NEUROANATOMY – Intrinsic brain anatomy and surgical approaches

THURSDAY 5th MODULE

1: Surface Surgical Anatomy. – Phylogenetic evolution of the human brain. – The cerebral lobes. – Craniometric points of the skull. – Brain surface functional understanding through intraoperative mapping.

MODULE 2: The Cerebral Substance (I). – The white matter of the human brain. – Lateral dorsal & ventral tracts. – How I do it: awake surgery. – Technical adjuncts for glioma surgery. – How I do it: endoscopic assisted glioma surgery.

SURGICAL STATION 1: Hands-On. – Intrinsic brain tumor resection on a 3D printed model.

SURGICAL STATION 2: Break-out Session. – The case for discussion: INSULAR GLIOMA.

SURGICAL STATION 3: Quiz Session. – Sulco-gyral organization and cortical 3D understanding based on real cases.

Today: Neurosurgical Approaches to the Cranial Compartments

Neurosurgical Approaches to the Cranial Compartments

This course is aimed at ST3-ST8 level trainees and subspecialty (skull base and cerebrovascular) fellows. Teaching of the approaches are tailored to the specific needs and experience of the individual trainee. This workshop is co-organised by the east and west of Scotland training programs. The program includes complex surgical procedures which cannot be performed by trainees without prior cadaveric exposure.

It covers the whole armamentarium of intracranial approaches and provides fundamental insight to very complex procedures. The focus is on enabling trainees to safely approach superficial and deep seated vascular and benign intracranial lesions arising from or being in proximity to the cranial vault or skull base. Trainees will gain a heightened appreciation of the critical structures encountered through these approaches.

Suitability

ST3-ST8 and subspecialty (skull base and cerebrovascular) fellows. Teaching of the approaches will be tailored to the specific needs and experience of the individual trainee.

Relevant Grades: ST3, ST4, ST5, ST6, ST7, ST8, SpR, SAS

Course Format

Introductory Lectures followed by hands on Cadaveric workshops. Commonly performed techniques such as pterional, bifrontal, middle fossa and retrosigmoid craniotomies will be covered as well as more complex approaches to the third ventricle, pineal region, antero-lateral brainstem and C1/C2 complex. State of the art Pentero Zeiss microscopes, Integra Mayfield clamps, Codman microinstruments, and Anspach high speed drills will be readily available in all stations (two participants per station – one faculty member per station)

Course Objectives

Familiarize trainees with the surgical anatomy pertinent to common as well as complex neurosurgical procedures, which will be comprehensively taught. Identify anatomical avenues for the safe exposure of both superficial and deeper intracranial structures. Expose trainees to microsurgical principles (appropriate application of the operating microscope, high speed drill, and microdissection).

Learning Outcomes

Upon completion of the course, participants should be able to:

  • Enable trainees to safely approach superficial and deep seated vascular and benign intracranial lesions arising from or being in proximity to the cranial vault or skull base.
  • Trainees will have a heightened appreciation of the critical structures encountered through these approaches.
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