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anterior_transarticular_screw_fixation

Anterior transarticular screw fixation

Anterior transarticular screw (ATS) fixation is a useful surgical option for atlantoaxial stabilization.

Using a standard anterior cervical approach, the vertebral bodies of the middle cervical spine are exposed. Blunt dissection then proceeded cranially along the anterior surface up to the C2-3 intervertebral disc. A Cusco speculum is placed to secure the operative field. Under biplanar fluoroscopy image guidance, a Kirschner-wire is introduced as a guide from the midpoint on the inferior border of the axis to the superior articular process (SAP) of the atlas, following the preoperative planning for the screw trajectories. The depth to the SAP of the atlas has to be measured, and a cannulated full-threaded screw of the same length inserted.

ATS fixation has been performed through the anterior retropharyngeal approach 1) 2) 3) 4).

Because wide tissue dissection is unavoidable with this approach, there is latent danger of tissue injury to the throat, trachea, esophagus, pharynx, major vessels, and lower cranial nerves. Advances in posterior instrumentation techniques and the technical difficulty of the anterior retropharyngeal approach have been cited as reasons why ATS fixation is rarely the procedure of choice. Recently, however, there have been a few reports on ATS fixation using minimally invasive techniques, such as microendoscopy and percutaneous screw systems 5) 6).

Although wide tissue dissection is unnecessary for these methods, there seems to be a higher risk of tissue injury during introduction of devices into the unopened operative field.

Case reports

2017

In Case 1, the patient was diagnosed with an unstable C1 fracture. The clinical features of the case did not allow for any type of posterior atlantoaxial fusion, Halo immobilization, or routine anterior fixation using the Reindl and Koller techniques. The possible manner of screw insertion into the anterior third of the right lateral mass was via a contralateral trajectory, which was performed in this case. Case 2 involved a patient with neglected posteriorly dislocated dens fracture who could not lie in the prone position due to concomitant cardiac pathology. Reduction of atlantoaxial dislocation was insufficient, even after scar tissue resection at the fracture, while transdental fusion was not possible. Considering the success of the previous case, atlantoaxial fixation was performed through the small approach, using the Reindl technique and contralateral screw insertion.

These two cases demonstrate the potential of anterior transarticular fixation of C1-C2 vertebrae in cases where posterior atlantoaxial fusion is not achievable. This type of fixation can be performed through a single approach if one screw is inserted using the Reindl technique and another is inserted via a contralateral trajectory 7).

2014

A patient with an old odontoid fracture and severe degenerative changes of the lateral atlantoaxial joints (LAAJs) who was treated successfully with ATS fixation. The method included the utilization of conventional surgical techniques plus rigid stabilization to attain solid fusion between the atlas and the axis 8).

1)
Kansal R, Sharma A, Kukreja S. An anterior high cervical retropharyngeal approach for C1-C2 intrafacetal fusion and transarticular screw insertion. J Clin Neurosci. 2011;18:1705–8.
2)
Koller H, Kammermeier V, Ulbricht D, Assuncao A, Karolus S, van den Berg B, et al. Anterior retropharyngeal fixation C1-2 for stabilization of atlantoaxial instabilities: Study of feasibility, technical description and preliminary results. Eur Spine J. 2006;15:1326–38.
3)
Lesoin F, Autricque A, Franz K, Villette L, Jomin M. Transcervical approach and screw fixation for upper cervical spine pathology. Surg Neurol. 1987;27:459–65.
4)
Vaccaro AR, Lehman AP, Ahlgren BD, Garfin SR. Anterior C1-C2 screw fixation and bony fusion through an anterior retropharyngeal approach. Orthopedics. 1999;22:1165–70.
5)
Li WL, Chi YL, Xu HZ, Wang XY, Lin Y, Huang QS, et al. Percutaneous anterior transarticular screw fixation for atlantoaxial instability: A case series. J Bone Joint Surg Br. 2010;92:545–9.
6)
Wang J, Zhou Y, Zhang Z, Li C, Zheng W, Zhang Y. Minimally invasive anterior transarticular screw fixation and microendoscopic bone graft for atlantoaxial instability. Eur Spine J. 2012;21:1568–74.
7)
Lvov I, Grin A, Kaykov A, Smirnov V, Krylov V. Anterior transarticular C1-C2 fixation with contralateral screw insertion: a report of two cases and technical note. Eur Spine J. 2017 Aug 8. doi: 10.1007/s00586-017-5257-6. [Epub ahead of print] PubMed PMID: 28791481.
8)
Sasaki M, Matsumoto K, Tsuruzono K, Yoshimura K, Shibano K, Yonenobu K. Anterior transarticular screw fixation as a conventional operation for rigid stabilization. Surg Neurol Int. 2014 Dec 30;5(Suppl 15):S544-7. doi: 10.4103/2152-7806.148032. eCollection 2014. PubMed PMID: 25593774; PubMed Central PMCID: PMC4287909.
anterior_transarticular_screw_fixation.txt · Last modified: 2017/08/10 18:39 by administrador