Atlantoaxial joint fusion using anterior transarticular screw fixation and bone grafting for atlantoaxial joint instability

Objective To evaluate the clinical application of atlantoaxial joint fusion using anterior transarticular screw fixation and bone grafting for atlantoaxial joint instability. Methods Twenty-three cases of atlantoaxial joint instability were

Three-dimensional CT angiography study on the relations between the vertebral artery and atlantoaxial joint

Background The vertebral artery （VA） and atlantoaxial joint （AAJ）, with complicated structures, are located in the depths of the head-neck boundary area, the regional anatomy of which cannot be shown globally and directly. This study aims to evaluate three-dimensional CT angiography （3DCTA） in displaying the AAJ, atlantoaxial segment of the vertebral artery （ASVA） and the identification of their interrelations. Methods Sixty-eight subjects without pathology of the ASVA and AAJ were selected from head-neck CTA examination. All the 3D images were formed with volume rendering （VR） together with techniques of separating, fusing, opacifying and false-coloring （SFOF）. On the 3D images, the ASVA and AAJ were observed, and their interrelations were measured. Results All the 3DCTA images were of high quality and up to our requirements. They could clearly and directly show the ASVA, ascending along the AAJ. There were 5 curves in the course of the ASVA, of which 2 curves were away from the atlantoaxial joint, one in the 2rid curve of 0.0 mm-5.4 mm, the other in the 4th of 2.6 mm-9.2 mm. There was no significant difference in the measurements between left and right （P 〉0.05）. The curved parts of the ASVA slightly expanded, with the biggest diameter of 5.6 mm in the 4th curve. Statistical comparison shows that the left ASVA is larger than the right （P 〈0.05）. Variations of the ASVA were found in 8 cases and of the AAJ in 12. Conclusions 3DCTA can globally and directly demonstrate the structures of the AAJ, ASVA and their interrelations. The 3D imaging data make up and enrich the research contents of regional anatomy and lay the foundation for related study and applications.

Iatrogenic atlantoaxial rotatory subluxation after thyroidectomy in a pediatric patient:A case report

BACKGROUND Atlantoaxial rotatory subluxation(AARS)is an uncommon disease with a greater prevalence among children than adults,and it is mostly associated with trauma.Iatrogenic spinal injury accounts for a low percentage of injuries.However,in AARS,20%-40%of cases are associated with surgery,and 48%are caused by infection.Here,we describe our experience with a case of iatrogenic AARS after general anesthesia.CASE SUMMARY A 12-year-old girl presented with right-sided torticollis and cervical motion limit.The patient had undergone thyroidectomy 2 mo ago.Computed tomography revealed AARS with bilateral locked facets.Following the failure of repeated external reduction under general anesthesia,the patient underwent an open surgical reduction.The patient gained atlantoaxial alignment without any complications.Follow-up radiographs showed a normal appearance without instability.The cervical spine of children is more predisposed to injury due to anatomical and biomechanical differences.AARS secondary to infection and surgery is known as Grisel’s syndrome,which involves non-traumatic AARS.Several cases of AARS after surgery and other procedures with no evidence of inflammation have been reported.Our experience shows that surgery requiring hyperextension of the neck after general anesthesia should also be included as a risk factor.CONCLUSION Surgeons and anesthesiologists should be careful not to excessively extend the neck during pediatric surgery.Moreover,clinicians caring for pediatric patients with recent head and neck procedures must be aware of common AARS presentations.

Posterior pedicle screw fixation combined with local steroid injections for treating axial eosinophilic granulomas and atlantoaxial dislocation:A case report

BACKGROUND Eosinophilic granuloma(EG)is a proliferative condition that affects the cells of bone tissue.There are no specific clinical signs or imaging manifestations in the early stages of the disease,making it simple to overlook and misdiagnose.Because of the disease's rarity,there is presently no standardized treatment principle.There are few accounts of such occurrences affecting the axis among children.We discovered a case of a child whose EG resulted in atlantoaxial joint dislocation and destruction of the axial bone.CASE SUMMARY After having pharyngeal discomfort for more than six months without a clear explanation,a 6-year-old boy was brought to our hospital.Following a careful evaluation,the pathology indicated a strong likelihood of an axial EG.Ultimately,we decided to treat the boy with posterior pedicle screw fixation and local steroid injections.CONCLUSION EGs of the upper cervical spine are quite uncommon in children,and they are exceedingly easy to overlook or misdiagnose.Posterior pedicle screw fixation and local steroid injections are effective treatments for patients with axial EGs affecting the atlantoaxial junction.