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Pre-operative irreducible C1–C2 dislocations: intra-operative reduction and posterior fixation. The “always posterior strategy”

  • Spinal Neurosurgery Report
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Abstract

Background

According to Menezes’ algorithm, pre-operative dynamic neuroradiological investigation in C1–C2 dislocations (C1C2D) instability is strongly advocated in order to exclude those patients not eligible for posterior fixation and fusion without previous anterior trans-oral decompression. Anterior irreducible compression due to C1C2D instability, it is said, needs trans-oral anterior decompression. We reviewed our experience in order to refute such a paradigm.

Methods

The study involves 23 patients who were operated on for cranio-vertebral junction (CVJ) instability; all of them had C1C2D of varying degree on x-ray, computerised tomography (CT) and magnetic resonance (MR) imaging of the CVJ. Pre-operatively, irreducible C1C2D was demonstrated only in 3 patients, (2 with Down’s Syndrome, one of them was harbouring os odontoideum, 1 Rheumatoid Arthritis), i.e. 13.04%; the remaining 19 (86.9%) had reducible C1–C2 dislocation. After an unsuccessful traction test conducted in the pre-operative phase under sedation, it was possible to completely reduce the C1C2D (with a combination of axial traction with light extension of the neck on the chest and a light flexion of the head on the neck by using a Mayfield head holder) and proceed to posterior fixation in all the patients under general anaesthesia using a precise “timing sequences fixation technique”. Wiring (C0 and C3 were fixed first being stretched up to approximately 10 lbs, then C2 in order to pull up this vertebra last by forcing approximately 8 lbs) or screw fixation methods were used to achieve fusion along with post-operative external orthosis and neuroradiological assessment of the C1C2D. The instrumentation produced a lever and pulley effect which assisted reduction of the dislocation.

Findings

At follow up (range 34–55 months-mean 45.33 months) the clinical picture was improved or stable in all patients.

Conclusions

Pre-operative irreducibility of the C1C2D should not be an absolute indication for trans-oral decompression. An attempt to reduce the dislocation under general anaesthesia and during posterior fixation should be attempted in Down’s syndrome, os odontoideum and rheumatoid arthritis.

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Correspondence to Massimiliano Visocchi.

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Comment

This study presents three cases of surgical treatment due to CVJ instability; all the three patients were diagnosed with irreducible C1–C2 dislocation. Under light sedation all the patients underwent a traction test in the preoperative phase. None of the patients showed a reduction of the shift. In such cases a number of authors recommend that anterior transoral decompression be carried out, which includes the following steps: removal of the dens as well as callus, granulation, and scar tissue, excision of the cartilage of the articular surfaces of the atlantoaxial joints, and occipitocervical fixation via anterior or posterior access.

The authors have identified a method that will save the patient this burdening phase of treatment. In their three cases the C1–C2 dislocation, although irreducible preoperatively and under traction, became reducible under general anesthesia, curarization and posterior fixation by using a precise “timing sequences fixation technique”. In these cases the instrumentation produced a lever effect with a pulley-like mechanism which forced the reduction of the CVJ complex. Early and long-term outcome of treatment in all three cases was satisfactory while the routine x-ray check-up revealed good decompression of neural structures and proper positioning of the C1/C2 complex.

Mariusz Maliszewski

Silesian University of Medicine, Sosnowiec, Poland

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Visocchi, M., Pietrini, D., Tufo, T. et al. Pre-operative irreducible C1–C2 dislocations: intra-operative reduction and posterior fixation. The “always posterior strategy”. Acta Neurochir 151, 551–560 (2009). https://doi.org/10.1007/s00701-009-0271-z

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