[Precision and safety of positioning pedicle screws in the thoracic and lumbar spine using a hand-guided aiming sleeve : A CT control study]. / Präzision und Sicherheit der Positionierung von Pedikelschrauben in der Brust- und Lendenwirbelsäule mittels handgeführter Zielhülse : Eine computertomographische Kontrollstudie.

BACKGROUND: For the implantation of pedicle screws, navigation-supported systems are nowadays used more and more to avoid screw misalignment by making the direction of the screw more predictable. OBJECTIVE: Examination of the precision after instrumentation of the pedicle screw with the hand-guided aiming sleeve. The aim was to verify that the implementation of the pedicle screws is plannable and precise by using 2D X­ray only. METHOD: This retrospective study analyzed 27 consecutive trauma patients (17-84 years, 13f/14m) with vertebral body fractures. The position and precision of 108 screws, implanted using the hand-guided aiming sleeve was investigated. To determine the position the actual course of the screws was examined using the postoperative 3D CT data set (GE Optima 540, General Electric Company Boston, MA, USA; slice thickness 1.25 mm). The screws were then compared to the previously defined ideal position of the tip of the screw. In addition to the absolute and relative deviation from the ideal target point, the convergence angle and the parallelism to the cover plate were determined. RESULTS: Of 108 implanted pedicle screws, 90 (83%) were within target. The remaining 18 (17%) represented a clinically irrelevant screw deviation: A lateral deviation was found in 17 pedicle screws (16%) and a medial deviation in 1 (1%). The average deviation from the ideal target point in the vertebral body was 2.3 mm ventrally with a standard deviation of ±â€¯2.3 mm. No screw misalignment or pedicle perforation was found. CONCLUSION: The transcutaneous implantation of pedicle screws with a hand-guided aiming sleeve in the thoracic and lumbar spine represents a safe and precise procedure. The risk of misalignment needing a revision is lower compared to other methods of navigated screw implantation reported in the literature [1-6]. A CT-based preliminary planning is not necessary. The method is economical, special technical equipment is not required.

Neurotrauma Emergencies during the SARS-CoV2 Pandemic at a Tertiary Medical Center: Analysis of Incidence and Outcome.

BACKGROUND: We assess the impact of lockdown in Germany due to the COVID-19 pandemic on the incidence and outcome of neurotrauma emergencies at a tertiary medical center. METHODS: All neurosurgical emergencies from March 16, 2020 (first lockdown in Germany) to January 31, 2021 were included and compared with a longitudinal case-cohort. Cases were descriptively recorded and retrospectively analyzed with respect to incidence and outcome. RESULTS: All emergencies defined as polytrauma referred to our center decreased by 10% during the pandemic (n = 226), whereas neurosurgical emergencies increased by 18.4% (764 vs. 905 cases). The number of specific neurotrauma emergencies increased by 44.4% (63 vs. 91 cases), yet statistically not significant (p = 0.245). The duration of treatment in the intensive care unit (ICU) extended from 621 to 1,056 days (p = 0.34). CONCLUSION: The reasons for the increase in the number of neurotrauma emergencies were the following: (1) many surrounding smaller care providers were canceled during this time and (2) there was a lack of free intensive care capacities in other hospitals, urging primarily maximum care providers to deal with more referrals. Both these facts and the prolonged treatment on ICUs strengthen the necessity for maximum care providers to keep ICU capacities for non-COVID patients. Specialized neurosurgical expertise should maintain in tertiary medical centers, even or particularly in exceptional circumstances such as the current pandemic.

Non-ischemic neurovascular emergencies at a supra-regional medical center during the SARS-CoV2-pandemia.

OBJECTIVE: To assess the impact of the lockdown in Germany due to the SARS-CoV2-pandemic on the incidence and the outcome of neurovascular emergencies at a tertiary medical center. METHODS: From March 16th, 2020 (first lockdown in Germany) to January 31st, 2021, all neurosurgical emergencies were included and compared to a longitudinal case-cohort. Cases were descriptively recorded and retrospectively analyzed with respect to incidence and outcome. RESULTS: All emergencies referred to our tertiary medical center decreased by 10% during the pandemic, whereas, neurosurgical emergencies increased by 18.4% (764 vs. 905 cases). Number of specific non-ischemic neurovascular emergencies increased by 29% (95 vs. 123 cases). The difference was not statistically significant (p = 0.53). Mortality rate increased dramatically by 40% during the pandemic throughout all neurovascular cases. As all included patients were negative PCR-tested for SARS-CoV2 the observed increase is unrelated to the virus infection. CONCLUSION: Unexpectedly, according to our data neurovascular emergencies raised in number and severity during the pandemic in Germany at our tertiary referral center. Furthermore, the case fatality increased. Even though our data lack proof of evidence for these findings, we might suggest two possible explanations for the absolute increase in numbers: firstly, patients might have refused to seek medical help while suffering only mild symptoms. Furthermore, as numerous lower-level medical centers restricted admissions, the referral times of patients in need of neurosurgical attention increased. We, therefore, suggest that even in a pandemic situation like the SARS-CoV2/COVID-19, it seems of utmost importance to retain dedicated neurovascular competence in designated centers to care for these emergencies.