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Background Musculoskeletal injuries (MSKIs) represent the most substantial and enduring threat to U.S. military readiness. Previous studies have focused on narrow surveillance periods, single branches of service, and used variable approaches for MSKI identification and classification. Therefore, the goals of this retrospective population study were to report the incidence, prevalence, and types of MSKIs sustained by active duty service members (ADSMs) across four Services in direct care (DC) and private sector care (PC) settings over fiscal years (FYs) 2010–2021, and to quantify and describe associated health care utilization and PC costs over the same period. Methods This study included ADSMs from the Air Force, Army, Marine Corps, and Navy. Prevalence and incidence rates for Head/Neck, Upper Extremity (UE), Spine (upper back, middle back, lower back, pelvic), and Lower Extremity (LE) MSKIs in ADSMs, associated health care utilization, and PC costs were derived by querying electronic health records from DC, PC claims, and theater medical data from the Military Health System Data Repository. Patient episodes of care and associated PC costs related to MSKIs in DC and PC settings were classified into mutually exclusive outpatient encounter categories and acute inpatient stays, body regions, and Services. Results Over FY10–21, the most prevalent MSKIs were LE (24–29%) followed by Spine (17–20%), UE (14–16%), and Head/Neck (6–8%). Across FY10–21, soldiers were more likely to sustain LE MSKI than Airmen (risk ratio 1.12–1.30) and Marines demonstrated an increasing risk of LE MSKI prevalence and incidence (relative to Airmen) over the study period. The rise in prevalence of LE, Spine, UE, and Head/Neck MSKIs over FY10–21 was accompanied by increased health care utilization and reliance on PC care, especially same-day surgeries (SDS). PC reliance for SDS increased across body regions from FY10 to its peak in FY20 (Head/Neck: 22.7% to 49.7%, Spine: 37.1% to 57.0%, LE: 38.6% to 51.5%, UE: 40.4% to 53.5%). In FY21, the MHS incurred the highest PC costs for LE MSKIs ($132,242,289), followed by Spine ($98,738,863), UE ($92,118,071), and Head/Neck ($42,718,754). Conclusions To our knowledge, this is the first population study of MSKIs in ADSMs spanning the ICD-10 CM transition (FY15–16) that includes the four Services. Across Services, MSKIs in the U.S. military remain a prevalent and persistent problem. Consistent with prior research, the LE was the most common and costly body region affected by MSKIs. Service members with MSKIs demonstrated an increasing reliance on PC for MSKI care, particularly SDS, over the study period. Expanding future research efforts to include all Services to assess risk factors and patient outcomes for treatments across DC and PC settings is vital to mitigate the threat posed by MSKIs to the readiness of the U.S. Armed Forces. [ABSTRACT FROM AUTHOR]

Background Low back pain and musculoskeletal injuries (MSKIs) of the Spine are the most common reason for U.S. active duty service members (ADSMs) to seek medical care. The purposes of this descriptive study were to report the prevalence/incidence, health care utilization, and health care costs attributable to Spine (thoracic, lumbar, sacral, and pelvic) MSKIs across the four major branches of service from Fiscal Years (FY) 2016 to 2021. Materials and Methods This was a retrospective, longitudinal population study, including ADSMs from the Air Force, Army, Marine Corps, and Navy. Prevalence and incidence rates for Spine MSKIs, associated health care utilization, and costs were obtained by querying electronic health records (EHRs) from military treatment facilities, private sector care (PC) claims, and theater medical data from the Military Health System Data Repository from October 1, 2015 to September 30, 2021 (FY16–21). Utilization associated with Spine MSKIs in both the direct care (DC) and PC settings was classified into mutually exclusive outpatient encounter categories and acute inpatient stays. PC costs related to Spine MSKIs were captured per year. Results In FY21, 269,301 ADSMs sought care for Spine MSKI, representing 18.0% of the U.S. Armed Forces. The prevalence of Spine MSKIs ranged from 17.4 to 19.5% during FY16–21, with the highest annual prevalence among the Army (20.7–22.9%) and Air Force (19.0–22.6%). Across the study period, Soldiers had the highest share (47.8–50.4%) of DC outpatient encounters for Spine MSKI (primary or secondary diagnosis). The Air Force relied most heavily on PC for outpatient Spine MSKI care across the study period, where in FY21 Airmen accounted for 36.5% of the outpatient PC Spine MSKI encounters totaling $21,140,935 in PC costs. In FY21, total PC costs for Spine MSKI totaled $99,317,832. Conclusions This retrospective, descriptive study establishes prevalence/incidence, health care utilization, and PC costs for Spine MSKIs across the Services from FY16–21 and highlights the burden of Spine MSKIs among the U.S. Armed Forces, with costs amounting to over $99 million in PC reliance in FY21 alone. [ABSTRACT FROM AUTHOR]

Background Musculoskeletal injuries (MSKIs) represent the most common, costly, and impactful medical conditions affecting active duty service members (ADSMs) of the United States Armed Forces. Inconsistent, variable MSKI surveillance methods and often incompletely described criteria for cohort selection, injuries, incidence, and prevalence have limited efforts to observe longitudinal trends, identify gaps in care, or highlight specific military branches or sites that could benefit from enhanced MSKI intervention protocols. The purpose of this manuscript is to present a comprehensive, well-documented, and reproducible framework for capturing and categorizing MSKI burden, healthcare utilization, and private sector costs for ADSMs across a 12-year period spanning the International Classification of Diseases, 10th Revision, Clinical Modification transition. Methods This was a retrospective, longitudinal population study, including ADSMs from the Air Force, Army, Marine Corps, and Navy. Prevalence and incidence rates for Upper Extremity, Lower Extremity, Spine, and Head/Neck MSKIs, associated health care utilization, and private sector costs were obtained by querying electronic health records from military treatment facilities, private sector care (PC) claims, and theater medical data from October 1, 2010 to September 30, 2021 (Fiscal Years 10-21), using the Military Health System Data Repository. Utilization associated with MSKIs per body region in the direct care and PC settings was classified into mutually exclusive outpatient encounter categories and acute inpatient stays. PC MSKI-associated costs were captured per year and categorized by service, body region, and setting. Conclusions MSKI surveillance research in ADSMs has been impacted by variable, often incompletely described methods. While our approach is not without limitations, our aim was to present a well-documented, reproducible methodology for MSKI investigation in military personnel. By presenting a comprehensive blueprint for capturing and categorizing MSKI care in U.S. service members, our goal is for this methodology to enhance the efforts of researchers, public health officials, and Military Health System leaders to combat MSKIs, the primary medical threat to military readiness. [ABSTRACT FROM AUTHOR]

Background Active duty service members (ADSMs) of the U.S. Armed Forces are uniquely at risk for musculoskeletal injuries (MSKIs) of the Head/Neck region, including the eye and face, from training with head gear, donning Kevlar, operating aircraft, and maintaining sitting or standing postures for prolonged durations. The purposes of this descriptive study were to report the prevalence/incidence, health care utilization, and health care costs attributable to Head/Neck MSKIs across the Services from fiscal years (FYs) 2016 to 2021. Methods This was a retrospective, longitudinal population study, including ADSMs from the Air Force, Army, Marine Corps, and Navy. Prevalence and incidence rates for Head/Neck MSKIs, associated health care utilization, and private sector costs were obtained by querying electronic health records from military treatment facilities, private sector care (PC) claims, and theater medical data from October 1, 2015 to September 30, 2021 (FYs 16–21), using the Military Health System Data Repository. Utilization associated with Head/Neck MSKIs in both the direct care and PC settings was classified into mutually exclusive outpatient encounter categories and acute inpatient stays. PC costs related to Head/Neck MSKIs were captured for each year. Results In FY21, 109,683 ADSMs sought care for Head/Neck MSKIs, representing 7.3% of the U.S. Armed Forces. The prevalence of Head/Neck MSKIs ranged from 6.9 to 7.8% during FY16–21, with the highest annual prevalence among the Air Force (8.0–9.4%) and Army (7.9–8.8%). Within direct care across the services, Soldiers presented for the highest proportion (45.9–47.9%) of outpatient encounters for Head/Neck MSKI annually. The Air Force relied most heavily on PC for outpatient Head/Neck MSKI care, which accounted for $9,134,741 in PC costs and comprised 37.2% of all PC encounters in FY21. Conclusions This retrospective, descriptive study established prevalence/incidence, health care utilization, and PC costs for Head/Neck MSKIs across the services from FY16–21, emphasizing the burden of Head/Neck MSKIs among the U.S. Armed Forces, with PC costs amounting to $42,912,940 in FY21 alone. [ABSTRACT FROM AUTHOR]

Despite advances in wearable robots across various fields, there is no consensus definition or design framework for the application of this technology in rehabilitation or musculoskeletal (MSK) injury prevention. This paper aims to define wearable robots and explore their applications and challenges for military rehabilitation and force protection for MSK injury prevention. We conducted a modified Delphi method, including a steering group and 14 panelists with 10+ years of expertise in wearable robots. Panelists presented current wearable robots currently in use or in development for rehabilitation or assistance use in the military workforce and healthcare. The steering group and panelists met to obtain a consensus on the wearable robot definition applicable for rehabilitation or primary injury prevention. Panelists unanimously agreed that wearable robots can be grouped into three main applications, as follows: (1) primary and secondary MSK injury prevention, (2) enhancement of military activities and tasks, and (3) rehabilitation and reintegration. Each application was presented within the context of its target population and state-of-the-art technology currently in use or under development. Capturing expert opinions, this study defines wearable robots for military rehabilitation and MSK injury prevention, identifies health outcomes and assessment tools, and outlines design requirements for future advancements. [ABSTRACT FROM AUTHOR]

The low oxygen content SiC fibers were exposed in simulated aeroengine circumstance of \begin{document}${P_{{{\rm{H}}_2}{\rm{O}}}}:{P_{{{\rm{O}}_2}}}:{P_{{\rm{Ar}}}} = $\end{document}14 kPa \begin{document}$:8$\end{document} kPa \begin{document}$:78$\end{document} kPa at 1200 ℃ for 1-50 h. Performances and structure of the fibers were characterized by element analysis, XRD, SEM and tensile test. The results show that the fibers have higher oxygen content, thicker oxide layer, lower strength compared with the fibers treated in dry air. Cracks and α-SiO2 crystal are more likely to occur in silica layer. The steam in the simulated circumstance can accelerate oxidation and crack formation in silica film.

This paper proposes an optimal trajectory planning model for automated on‐ramp merging. The minimum cost path based on the optimal control theory is selected as the optimal trajectory of the on‐ramp merging vehicle, which could avoid potential collisions and satisfy the kinematic constraints on the vehicle motion. Moreover, an optimal control strategy is presented to solve the trajectory planning problem of the facilitating vehicle. An analytical closed‐form solution is derived by using the Hamiltonian analysis and the path information of the merging vehicle. Particularly, the proposed planning process also considers the lateral movement of the on‐ramp merging, which is more efficient in the application. Owing to the location and time that the on‐ramp vehicle merges into the mainline can be obtained endogenously by its planning process, the model has high adaptation to various on‐ramp environments. Solutions to the above two optimal methods are implemented in a model predictive control framework to cope with possible external disturbances. Several numerical simulations and PreScan‐Simulink Co‐Simulation illustrate the effectiveness of the proposed model. Furthermore, this methodology is compared with a typical CACC strategy to demonstrate its potential to reduce fuel consumption, as well as improve passenger comfort. [ABSTRACT FROM AUTHOR]

Globally, 57.7 million people lived with traumatic limb loss in 2017, with the prevalence of amputation in the United States alone expected to reach 3.6 million by 2050. Pain is a common complication after limb loss, with up to 59% of patients experiencing residual limb pain (RLP). Although RLP is often due to a structural etiology, it is difficult to treat because the exact structure involved is frequently not apparent on history and physical examination alone. This narrative review aims to summarize the available literature on diagnostic ultrasound of the residual limb and examine the utility of ultrasound in identifying specific pathology. A total of 31 peer‐reviewed manuscripts published between 1989 and 2021 were included, grouped by pathology. Although ultrasound presents a promising and cost‐effective approach to identifying pathology within the residual limb, many gaps remain in the current knowledge, and no specific protocol for a sonographic assessment of the residual limb has ever been proposed. Future studies of diagnostic ultrasound of the residual limb should focus on replicable sonographic techniques and standardized exam protocols. [ABSTRACT FROM AUTHOR]

Background Ketamine infusions are frequently employed for refractory complex regional pain syndrome (CRPS), but there are limited data on factors associated with treatment response. Sympathetic blocks are also commonly employed in CRPS for diagnostic and therapeutic purposes and generally precede ketamine infusions. Objectives We sought to determine whether demographic and clinical factors, and technical and psychophysical characteristics of sympathetic blocks are associated with response to ketamine infusion. Methods In this multi-center retrospective study, 71 patients who underwent sympathetic blocks followed by ketamine infusions at 4 hospitals were evaluated. Sympathetically maintained pain (SMP) was defined as ≥ 50% immediate pain relief after sympathetic block and a positive response to ketamine was defined as ≥ 30% pain relief lasting over 3 weeks. Results Factors associated with a positive response to ketamine in univariable analysis were the presence of SMP (61.0% success rate vs 26.7% in those with sympathetically independent pain; P  = .009) and post-block temperature increase (5.66 ± 4.20 in ketamine responders vs 3.68 ± 3.85 in non-responders; P  = .043). No psychiatric factor was associated with ketamine response. In multivariable analysis, SMP (OR 6.54 [95% CI 1.83, 23.44]) and obesity (OR 8.75 [95% 1.45, 52.73]) were associated with a positive ketamine infusion outcome. Conclusions The response to sympathetic blocks may predict response to ketamine infusion in CRPS patients, with alleviation of the affective component of pain and predilection to a positive placebo effect being possible explanations. [ABSTRACT FROM AUTHOR]