Introduction: This study presents the results of seven aerospace manikin and three post mortem human surrogate (PMHS) horizontal deceleration sled tests. The objective of this study was to establish a body of baseline data that examines the ability of small (fifth percentile) manikins to predict whole-body kinematics associated with aircraft ejection, and whether currently available head and neck injury criteria are applicable in these situations.
Methods: Subjects were exposed to a short-duration local z-axis sled pulse while horizontally seated and restrained in an ejection seat. Test subjects included instrumented fifth percentile female and male manikins, and two small (163.8 cm, 48.3 kg; 143.5 cm, 48.6 kg) female and one small (166.2 cm, 54.3 kg) male PMHS.
Results: The anterior (local x-axis) translations of the PMHS heads were less than those observed in the manikin tests, but the local z-axis translations of the PMHS heads were greater than those of the manikins. Z-axis translations of the manikins' T1 were generally similar to those of the PMHS T1, but the anterior x-axis translations of T1 were greater in the PMHS. The neck injury criterion (Nij) tended to under-predict observed injury (primarily ruptures of the posterior ligaments at C4-5, T2-3), and the Beam Criterion (BC) tended to over-predict observed injury for small occupants. The USN/USAF neck injury criteria (NIC) performed best in predicting the observed injuries.
Discussion: Present manikin designs do not predict the kinematics of PMHS in ejection tests. Further refinement of existing injury criteria is required to accurately predict location and severity of ejection-induced injuries.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3357/asem.2472.2009 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Biomechanical coordination and variability alters following repetitive movement fatigue in overhead athletes with painful shoulder.
Sci Rep
January 2025
Department of Sport Biomechanics, Faculty of Sports Sciences, Bu-Ali Sina University, Hamedan, Iran.
Most sports and leisure activities involve repetitive movements in the upper limb, which are typically linked to pain and discomfort in the neck and shoulder area. Movement variability is generally expressed by changes in movement parameters from one movement to another and is a time-dependent feature of repetitive activities. The purpose of this study was to examine the effect of repeated movement-induced fatigue on biomechanical coordination and variability in athletes with and without chronic shoulder pain (CSP).
View Article and Find Full Text PDFLymph node metastasis in level IIb neck dissection for clinically node-negative oral squamous cell carcinoma patients: an 11-year retrospective study.
Int J Oral Maxillofac Surg
January 2025
Service de Chirurgie Maxillo-Faciale et Stomatologie, Université de Bordeaux, CHU Bordeaux, Bordeaux, France. Electronic address:
The most common complication associated with selective neck dissection is spinal accessory nerve dysfunction and shoulder disability, which result from level IIb dissection. The main objective of this study was to evaluate the incidence of level IIb lymph node metastasis in clinically node-negative (cN0) oral squamous cell carcinoma (OSCC) patients. Patients presenting with cN0 OSCC between November 2012 and November 2023 were included retrospectively.
View Article and Find Full Text PDFComparative analysis of injuries related to self-harm, assault, and intimate partner violence: insights from U.S. Emergency Departments (2005-2021).
Inj Prev
January 2025
Orthopaedic Surgery, Riley Hospital for Children at Indiana University Health, Indianapolis, Indiana, USA.
Background: Emergency departments are on the front lines of non-fatal self-harm injury (SHI). This study identifies patterns in patients presenting to emergency departments with SHI compared with patients presenting with assault and intimate partner violence.
Methods: Using the National Electronic Injury Surveillance System All Injury Program database, we analyzed SHI cases in the emergency department from 2005 to 2021 and examined demographic characteristics, injury mechanism and anatomic location, emergency department disposition and temporal patterns relative to cases involving assault and intimate partner violence.
Sporotrichosis in the earlobe caused by placing an earing.
Braz J Infect Dis
January 2025
Instituto Gonçalo Moniz - FIOCRUZ, Salvador, BA, Brazil; Universidade Estadual da Bahia (UNEB), Salvador, BA, Brazil. Electronic address:
A 22-year-old woman presented with an ulcer on her right earlobe 2 months ago, with inflammation and enlarged ipsilateral lymph nodes in her neck. She was treated with antibiotics without success and then was referred to an infectious disease specialist. She has a cat at home with sporotrichosis, but without direct contact with the lesion, she did not remember any scratching by the cat.
View Article and Find Full Text PDFEndoscopic Versus Microscopic Stapedotomy: A Systematic Review and Meta-analysis of Randomized Controlled Trials.
Otolaryngol Head Neck Surg
January 2025
Department of Otolaryngology-Head and Neck Surgery, Jaber Al-Ahmed Hospital, Kuwait City, Kuwait.
Objective: To compare the safety and efficacy of endoscopic versus microscopic stapedotomy in patients with otosclerosis.
Data Sources: PubMed, Embase, Web of Science, Scopus, Google Scholar, and CENTRAL.
Review Methods: Eligible randomized controlled trials (RCTs) were assessed for bias using Cochrane's instrument.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!