Low Back Injuries in Male Ballet Dancers: A Review of the Literature

TITLE: Low Back Injuries in Male Ballet Dancers: A Review of the Literature ABSTRACT BODY: Purpose: Repetitive practice of motions that can require extremes for hip and lumbar spine range of motion increase injury risk for dancers. Male dancers have increased risk of lost dancing days from injury related to lifts of female dancers. This is a review of the available literature examining spine injuries in male dancers. Methods: A literature search was performed using the keywords: male, dancer, ballet, pain, injury, and low back pain. The following databases were used: Cochrane Library, CINAHL, Pubmed, and PEDro. To expand our search, we examined references of our target papers for further relevant research. Studies were deemed relevant if they were about spine injuries and ballet dancers. Results: There are very few studies that investigate the types and frequency of injuries in male ballet dancers. For the studies that examine male ballet dancer spine injuries, they do not provide evidence for prevention of such injuries. Overall, there are very few studies on this topic with only one systematic review in 2008. We recommend that future research focus on rehabilitation and injury prevention in male ballet dancers. Conclusions: Despite spine injuries being common in dancers, there is no evidence based way to identify those at risk for injury and how to prevent reinjury. Future studies are needed to provide high-quality evidence for identifying those at risk for spine injuries, and on effective interventions for ballet dancers. Clinical Relevance: As with other athletes, dancers can experience the negative effects of physical injury to their personal lives. To date, athletic injury research is mostly focused on professional sports such as football, baseball, etc despite dancers experiencing similar work participation issues with injury. This paper provides a starting point for future research into injury detection and rehabilitation in dancers. Authors: Steere KB, Duncan A, Johnstone K, Lux E. References: 1. Ramkumar PN, Farber J, Arnouk J, Varner KE, McCulloch PC. Injuries in a Professional Ballet Dance Company. Journal of Dance Medicine & Science. 2016;20(1):30-37. 2. d’Hemecourt PA, Luke A. Sport-Specific Biomechanics of Spinal Injuries in Aesthetic Athletes (Dancers, Gymnasts, and Figure Skaters). Clinics in Sports Medicine. 2012;31(3):397-408. doi:10.1016/j.csm.2012.03.010. 3. Allen N, Nevill A, Brooks J, Koutedakis Y, Wyon M. Ballet Injuries: Injury Incidence and Severity Over 1 Year. J Orthop Sports Phys Ther. 2012;42(9):781-A1. doi:10.2519/jospt.2012.3893. 4. Gottschlich LM, Young CC. Spine Injuries in Dancers. Current Sports Medicine Reports (American College of Sports Medicine). 2011;10(1):40-44. 5. Hincapié CA, Morton EJ, Cassidy JD. Musculoskeletal Injuries and Pain in Dancers: A Systematic Review. Archives of Physical Medicine and Rehabilitation. 2008;89(9):1819-1829. doi:10.1016/j.apmr.2008.02.020

Inorganic Amino-Nitro-Guanidinium Derivatives

1-Amino-3-nitroguanidine (ANQ, 1) was synthesized by hydrazinolysis of nitroguanidine (NQ) with hydrazine hydrate. Four different amino-nitroguanidinium salts (chloride (2), bromide (3), iodide (4) and sulfate (5)) were synthesized and structurally characterized by low-temperature X-ray diffraction. The halides 2–4 could only be obtained crystalline as monohydrates. In addition, they were characterized by NMR and vibrational spectroscopy, elemental analysis and the sensitivities towards impact, friction and electrostatic discharge were determined. The compounds can be used in silver (AgX, X = Cl, Br, I) and barium (BaSO4) based metathesis reactions in order to form more complex salts of 1-amino-nitroguanidine

Detailed Pilots Specification

The Electronic Archiving Service consists of a series of activities covered by software tools and manual workflow steps. These tools are currently partly in existence, some are being developed by E-ARK project, many more are to be added by developments of the digital preservation community in the future. The role of this report is to identify the most relevant scenarios for the E-ARK Service, define which scenario which level of activity is needed in order to bridge the gap of the currently existing solutions (e.g. integration, software development, interface definition

Documentation, Common Information and Short Overview of the E-ARK pilots

This report contains the common information and short overview of the pilots, along with references to the final version of the Pilot Definition Excel files and Pilot Documentation Packages

E‐ARK Dissemination Information Package (DIP) Draft Specification

The primary aim of this report is to present the first version of the E-­‐ARK Dissemination Information Package (DIP) format. In order to do so the report describes the workflows and use cases of archival access services, and ultimately makes use of these these to present a set of requirements which should be followed when designing a DIP format. As access to archival records is largely dependent on the tools and environments used, the secondary aim of the deliverable is to go beyond the DIP format and look closely at the tools needed for preparing and using the DIP

Recommended Practices and Final Public Report on Pilots

This report summarizes pilot activities, achievements and best practice recommendations using the following chapter structure: Chapter 1 - This introductory chapter. Chapter 2 - Planning and executing the E-ARK pilots Summary of all pilot related activities in the 3 years of the pilot, from planning to evaluation. Chapter 3 - Pilot overview A brief overview of the full-scale and additional pilots. Chapter 4 - Pilot report Summary of the pilot execution and results with recommended practices and further development recommendations. The chapter consists of the following sections for each full-scale pilot: Pilot scenario details Execution report Changes to previous plans Feedback report, and Recommended practices and lessons learnt. Chapter 4 ends with an overview of the external evaluations performed by non-EARK member organizations. Chapter 5 - Pilot evaluation Evaluation of the full-scale pilot against project objectives and success criteria. Chapter 6 - Referenced documents and web pages Appendix 1 – Extract from E-ARK Description of Wor

Correlation of CT-based bone mineralization with drilling-force measurements in anatomical specimens is suitable to investigate planning of trans-pedicular spine interventions.

This interdisciplinary study examined the relationship between bone density and drilling forces required during trans-pedicular access to the vertebra using fresh-frozen thoraco-lumbar vertebrae from two female body donors (A, B). Before and after biomechanical examination, samples underwent high-resolution CT-quantification of total bone density followed by software-based evaluation and processing. CT density measurements (n = 4818) were calculated as gray values (GV), which were highest in T12 for both subjects (GVmaxA = 3483.24, GVmaxB = 3160.33). Trans-pedicular drilling forces F (Newton N) were highest in L3 (FmaxB = 5.67 N) and L4 (FmaxA = 5.65 N). In 12 out of 13 specimens, GVs significantly (p < 0.001) correlated with force measurements. Among these, Spearman correlations r were poor in two lumbar vertebrae, fair in five specimens, and moderately strong in another five specimens, and highest for T11 (rA = 0.721) and L5 (rB = 0.690). Our results indicate that CT-based analysis of vertebral bone density acquired in anatomical specimens is a promising approach to predict the drilling force appearance as surrogate parameter of its biomechanical properties by e.g., linear regression analysis. The study may be of value as basis for biomechanical investigations to improve planning of the optimal trajectory and to define safety margins for drilling forces during robotic-assisted trans-pedicular interventions on the spine in the future

Occurrence of Paratanaisia confusa Freitas, 1951 in free-living guira cuckoo (Guira guira, Cuculiformes: Crotophagidae)

Abstract This report presents a description of natural infection of an adult free-living guira cuckoo with Paratanaisia confusa. Histological and morphological evaluations of renal and parasite samples were performed. The morphological analysis of the parasites revealed spiny tegument, characteristic of P. confusa helminthes. Although macroscopic alterations were absent in the kidneys, the histopathology revealed parasites inside the collecting ducts causing dilatation and destruction of the lining epithelial cells in addition to small focal inflammatory infiltrates in the renal parenchyma. However, as the bird was free-living and naturally infected it was not possible to confirm if all these alterations were directly caused by the parasite presence or if they were related to causes other than the parasitism. Nonetheless, such findings indicate that these trematodes may have pathogenic potential in this host