Differences in femur geometry and bone markers in atypical femur fractures and the general population

This study aimed to identify differences in femur geometry between patients with subtrochanteric/shaft atypical femur fractures (AFFs) and the general population, and to evaluate the biomechanical factors related to femoral bowing in AFFs. We retrospectively reviewed 46 patients. Data on age, and history and duration of bisphosphonate use were evaluated. Femur computed tomography images were reconstructed into a 3D model, which was analyzed with a geometry analysis program to obtain the femur length, femur width and length, and femoral bowing. Patients were divided into two groups according to fracture location: the subtrochanteric and shaft AFF groups. We compared all parameters between groups, and also between each group and a general population of 300 women ≥ 60 years. Thirty-five patients had a history of bisphosphonate use (average duration, 6.1 years; range, 0.8-20 years). There was no statistical difference in bone turnover markers between the two groups. The shaft AFF group had a lower radius of curvature (ROC) (P = 0.001), lower bone mineral density (BMD, T score) (P = 0.020), and lower calcium (P = 0.016). However, other parameters and rate of bisphosphonate use were not significantly different. There were no significant differences in the parameters of the subtrochanter AFF group and the general population, but the shaft AFF group demonstrated a wider femur width (P < 0.001), longer anteroposterior length (P = 0.001), and lower ROC (P < 0.001) than the general population. Femoral bowing and width increased in shaft AFFs, but similar to subtrochanter AFFs compared to the general population. Our results highlight the biomechanical factors of femur geometry in AFFs

Population-based, three-dimensional analysis of age- and sex-related femur shaft geometry differences

This study deals with differences of femoral geometric focus on the bowing and width. Analysis using three-dimensional skeletonization showed increase of femoral bowing and femur width over life (more in women), and widening of the medullary canal only in women after 50 years old, not in men. Introduction The changes in femur geometry that occur with aging and lead to fragility or insufficiency fracture remain unclear. The role of the lower limb geometry, including the femur and femoral bowing, has become a point of discussion, especially in atypical femur fracture. This study aimed to analyze femur shaft geometry using three-dimensional skeletonization. Methods We acquired computed tomography images of both femurs obtained. A total of 1400 age- and sex-stratified participants were enrolled and were divided into subgroups according to age (by decade) and sex. The computed tomography images were used to produce 3-dimensional samplings of anatomical elements of the human femur using reconstruction and parametrization from these datasets. The process of skeletonization was conducted to obtain compact representation of the femur. With the skeletonization, we were able to compare all parameters according to age and sex. Results The femur length was 424.4 +/- 28.6 mm and was longer in men (P < 0.001). The minimum diameter of the medullary canal was 8.9 +/- 2.0 mm. The radius of curvature (ROC) was 906.9 +/- 193.3 mm. Men had a larger femur length, femur outer diameter, and the narrowest medullary diameter (P < 0.001, respectively). Women had significantly smaller ROC (P < 0.001). ROC decreased by 19.4% in men and 23.6% in women between the ages of 20 to 89 years. Femur width increased over life by 11.4% in men and 24.5% in women. Between the ages of 50 and 89 years, the medullary canal appears to have increased by 32.7% in women. Conclusion This geometry analysis demonstrated that femoral bowing and femoral width increased related to aging, and that the medullary canal widened after the age of 50 years in women. This cross-sectional study revealed important age- and sex-related differences in femur shaft geometry that occur with aging

Attitude of Medical Students About Their Role and Social Accountability in the COVID-19 Pandemic

Background: In this study, we aimed to explore the attitude of medical students toward their role and social accountability in this pandemic era. An online survey was developed to elicit information on (1) the role of medical students in the pandemic era; (2) Medical education in the "new normal," and (3) the impact of COVID-19 on medical students. Methods: The online survey, developed by a team consisting of three medical students, three psychiatry residents, and three professors of psychiatry, was conducted on 574 participants (213 medical students, 180 graduates, and 181 professors) in the University of Ulsan College of Medicine, Seoul, South Korea. Anxiety symptom rating scales, including the Stress and Anxiety to Viral Epidemics-6 (SAVE-6) scale and the Generalized Anxiety Disorder-7 (GAD-7) scale, were applied to measure participant anxiety level. Results: Medical students indicated their willingness to join the healthcare response to the COVID-19 pandemic, if requested; however, graduates and professors recommended that medical students continue their training rather than join the pandemic healthcare response. In the new normal era, medical education has had to change appropriately. Moreover, adequate knowledge of COVID-19 infection and spread must be considered for the continuation of clinical clerkships during the pandemic. Overall, medical students who indicated anxiety about treating possible or confirmed cases of COVID-19 rated higher on the SAVE-6 scale. Finally, medical students who reported that COVID-19 had an impact on their studies and daily life rated higher on the general anxiety scale (GAD-7). Conclusion: Social accountability is an important issue for medical students in the pandemic era. At the same time, non-disruption of their academic calendar would ensure continuous availability of component medical professionals, which is important for adequate future healthcare responses