Purpose. In stabilisations of atlantoaxial instabilities it holds risks to injure the A. vertebralis as well as neurological structures. Furthermore the posterior approach of the upper part of the cervical spine requires a huge and traumatic preparation of the soft tissue. However the anterior transarticular C1-2 fusion (ATF) is less traumatic and offers almost the same strengh of the stabilisation. Methods. Since the 01/2007 22 multimorbid patients with atlanto-axial instabilities of different entities were treated via the ATF, were regular examined radiologicaly (x-ray/CT) and the procedure critically judged. Results. C1-2 fusions were performed in 22 patients (17f, 5m, Ø 81,67 years). Main symptoms was pain radiating in the upper cervical spine and the occiput, 2 Patients complaining radiating pain with paraesthesia. The average operation-time took 64,5 min. Leftside the screws of Ø 39,5mm (32–44mm), rightside of 36mm (32–44mm) were inserted in addiction to the point of access and the angle of insertion (mediolateral angle Ø 32,0°, ventrodorsal Ø17,6°). No introperative complications occured, one revision had to be done because of p.o. bleeding, one because of screw dislocation. Postoperative x-ray and CT control of the upper cervical spine showed 30/44 screws in 22 patients in correct position. 8 (18,2%) screws were too long, 3 (6,8%) screws were placed too anterior and 3 (6,8%) too medial. 8 additional positionated dens-screws were in correct position. After a clear learning curve both screws of the 6th patient were positoinated correct. Two aspects are important for success: Correct entry point and right insertion of the angle in the coronar and sagittal view. A low intraoperative blood loss, a non traumatic access as well as an immediate pain decrease have to be valued positively for this procedure. Conclusions. The gentle procedure of the ATF requires-despite of the huge experience in anterior surgery of dens fractures - a learning curve, because of the more proximate insertion point, the flat insertion angle and the closeness of the A. vertebralis. If these aspects are going to be noticed, failed screw positioning and excessive length as well as injuries of the A. vertebralis can be avoided

Purpose of the Study. At our Department, we prefer surgical treatment of all patients with Type II and III fractures of the dens, regardless of the age, with the exception of non-displaced fractures or perfectly reduced fractures in young patients. Material and Methods. We treated surgically 28 patients 65 years old and older with dens fractures. The group consisted of 13 men and 15 women with a mean age of 77.4 years (range, 65–90 years). According to the type of treatment, anterior srew fixation or posterior C1–C2 fixation, the whole cohort was divided into 2 groups that were subdivided into two age groups of patients 65–74 years old and 75 years old and older. The age group of patients 65–74 years old included 8 patients with a mean age of 68.5 years and the mean age of the age group of patients 75 and more years old was 81 years. The injury was caused in 22 cases by a fall, in 5 by a car accident. Only in 1 case the injury was caused differently. Neurological deficits were found in three patients, all of them Frankel D type. All patients with injury to the dens underwent radiograph examination in the lateral and transoral projections and CT scan including the sagittal and frontal reconstructions of the atlantoaxial complex and in most cases also MRI examination to eliminate injury to the transverse ligament of the atlas. Based on these examinations, the type of injury was determined and method of treatment indicated. Final retrospective evaluation of the patients was carried out at the interval of 12 to 78 months after the primary surgery (mean 31.3 months) taking into account aetiology of the injury, type of injury, neurological finding, method of treatment, union of the dens fracture line or, where appropriate, C1–C2 fusion, stability of the spine and the final outcome. Statistical analysis was based on X2-test. Results. Comparison of the two age groups showed a statistically significant difference in the mortality (p<0.05), with 0% in the younger group and 40% in the older group. In total, mortality within 6 weeks after the injury accounted for 28.6%. Comparison of surgical techniques revealed 21.4% mortality after anterior screw fixation of the dens and 35.7% mortality after posterior instrumented fusion. The difference was statistically insignificant (p>0.05). Of the 20 surviving patients, 11 were treated with anterior screw fixation and 9 with posterior instrumented fusion. In the two groups there was only one case of nonunion of the dens (9.1%) and one fibrous callus in the region of C1–C2 fusion and the fracture line in the dens (11.1%). The difference was again insignificant (p>0.05). Conclusions. Active surgical treatment conduces considerably to the improvement of the quality of life of elderly patients after dens fractures. Surgical technique should be tailored to the patient's general condition, and osteoporosis and degenerative changes of the spine in particular. Mortality is influenced by the patient's age rather than by the surgical technique used. Elderly patients with a neurological deficit mostly die of associated diseases regardless of the method of treatment