Combat Musculoskeletal Wounds in a US Army Brigade Combat Team During Operation Iraqi Freedom

Identifying Improvements in Treating Extremity Musculoskeletal Injuries During Prolonged Care

INTRODUCTION

In prolonged care scenarios, where medical evacuations are significantly delayed, the treatment and transport of casualties with extremity musculoskeletal injuries will drain combat units' human resources. Developing enhanced splinting techniques to restore casualty mobility and function can alleviate this drain. To guide this development, a panel of tactical combat and wilderness medicine experts was assembled to determine which extremity musculoskeletal injuries had the greatest impact on unit capabilities, and the materials available for splinting these injuries.

INFORMATION GATHERING

Unstructured consultations with panel members yielded preliminary lists of injuries and materials. These lists were consolidated and redistributed to panel members for final evaluation where they ranked the injuries based on frequency and human resource cost and assessed the accessibility of materials. Responses for the final evaluation were statistically analyzed using Wilcoxon rank-sum tests and Placket Luce models.

LESSONS LEARNED

Aggregated responses indicated that panel members thought that knee and ankle ligamentous injuries and radial head fractures were the most frequently occurring injuries, although closed distal femoral fractures, below knee amputations, and open tibia fractures would require the most demand for injury care. Assessing the combined impact of frequency and human resource cost indicated that knee and ankle ligamentous injuries and closed tibia fractures had the greatest impact on unit readiness. Responses also indicated that a variety of materials would be available for applying or improvising splints.

CONCLUSION

Although the combined impact of knee and ankle ligamentous injuries were ranked the highest, limitations in relative rankings and the existence of effective low-cost treatments for these injuries suggest that greater gains in unit effectiveness would come from focusing on developing solutions for fractures with higher human resource cost, such as leg and arm fractures. This information can be used to develop enhanced splints that can preserve unit readiness in the field.

Development of a multidimensional military readiness assessment

There is a need to be able to accurately evaluate whether an injured service member is able to return to duty. An effective assessment would challenge and measures physical and cognitive performance in a military-relevant context. Current assessments are lacking in one or more of these aspects. The simulation and data capture abilities of virtual reality systems are promising for use as the basis of multidimensional assessments. The team has previously developed a military-specific assessment in the Computer Assisted Rehabilitation Environment (CAREN) called the Readiness Evaluation During simulated Dismounted Operations (REDOp). Due to notable limitations in the original assessment, we have developed the next iteration, REDOp2. The assessment is able to challenge and measure a broader range of physical and cognitive performance domains in a more streamlined fashion. While limited to facilities with a CAREN, REDOp2 has the potential to provide an effective tool for highly trained and experienced wounded service members that require thorough assessment prior to returning to duty to ensure the safety of the team and mission. This methods paper describes the specific limitations in REDOp, how they were addressed in REDOp2, and suggested next steps to prepare the assessment for implementation.

The Impact of Deployment and Combat Exposure on Physical Health Among Military Personnel: A Systematic Review of Incidence, Prevalence, and Risks

OBJECTIVES

The impact of deployment and combat on mental health of military personnel is well described. Less evidence is available to demonstrate and summarize the incidence, prevalence, and risks of these exposures on physical health. This study aims to (1) systematically review the available literature to determine the incidence and prevalence of physical health conditions among military personnel during and after deployment and (2) investigate the risks of deployment and combat exposure on physical health.

METHODS

A systematic review using the PubMed and EMBASE databases was performed. The literature search was limited to articles written in English, published from 2000 through 2019. The quality of studies was assessed with the Joanna Briggs Institute Appraisal Checklist. The results were grouped per system or condition of physical health and presented by forest plots without a combined effect size estimate.

RESULTS

Thirty-two studies were found eligible for this review. We identified a wide variety of incidence and prevalence rates of numerous physical health conditions and a high heterogeneity across the included studies. Acute respiratory symptoms, diarrhea, musculoskeletal injuries, pain, and tinnitus were found to be the most incident or prevalent conditions. Except for hearing loss, no associations with deployment and physical health problems were observed. An increased risk for asthma, headache, hearing loss, and pain was reported in relation to the combat exposure.

CONCLUSION

Given the characteristics of included studies and extracted data, the magnitude of the found differences in incidence and prevalence rates is most likely to be due to methodological heterogeneity. The specific exposures (e.g., infrastructure, environmental conditions, and activities during deployment) are suggested to be the determinants of (post) deployment physical health problems and need to be addressed to decrease the impact of deployment. Findings from this systematic review highlight which conditions should be addressed in response to service members' health and wellness needs in the (post)deployment phase and may be used by clinicians, researchers, and policy-makers. However, knowledge gaps regarding the potential risk factors during deployment and combat still exist. Studies using consistent methods to define and measure the physical health conditions and specific exposures are needed.

Orthopedic treatment, complications, and cost analysis of 67 soldiers injured in a three-month period

OBJECTIVES

This study aims to analyze the musculoskeletal injury types, injury mechanisms, treatment modalities, complications, and costs of 67 consecutive soldiers wounded in the battlefield in Syria civil war over a period of three months.

PATIENTS AND METHODS

This retrospective study was conducted between January 2018 and March 2018 at Kilis State Hospital. The study included 67 male patients (median age 28.5 years; range, 15 to 46 years). Patients' ages, injury mechanisms, fracture types, fracture locations, injury severity scores, mangled extremity severity scores, complications, and treatment costs were evaluated.

RESULTS

Twenty-three patients were injured due to handmade explosives, 21 patients due to gunshots, 16 patients due to landmines, five patients due to rockets, and two patients due to grenades. A total of 35.8% of the patients (n=24) had concomitant trauma. The mean hospitalization period was 10.2 days (range, 1-45 days). A total of 88 treatments were performed on these patients. Thirty-six of these treatments were external fixators, 21 were amputations, 12 were open reduction internal fixations, seven were closed reduction internal fixations, five were intramedullary nailings, three were cannulated screws, three were fasciotomies, and one was an arthrodesis. The treatment costs ranged from 1,577 to 296,286 Turkish Liras. Complications were observed in 17 patients and 11 of them developed infections, three of them had compartment syndrome, and three died during the hospitalization period.

CONCLUSION

The increase in warfare technology is correlated with the severity of military injuries in the battlefields. These injuries still lead to high traumatic amputation rates, high-risk complications, and high costs.

Late immune consequences of combat trauma: a review of trauma-related immune dysfunction and potential therapies

With improvements in personnel and vehicular body armor, robust casualty evacuation capabilities, and damage control resuscitation strategies, more combat casualties are surviving to reach higher levels of care throughout the casualty evacuation system. As such, medical centers are becoming more accustomed to managing the deleterious late consequences of combat trauma related to the dysregulation of the immune system. In this review, we aim to highlight these late consequences and identify areas for future research and therapeutic strategies. Trauma leads to the dysregulation of both the innate and adaptive immune responses, which places the injured at risk for several late consequences, including delayed wound healing, late onset sepsis and infection, multi-organ dysfunction syndrome, and acute respiratory distress syndrome, which are significant for their association with the increased morbidity and mortality of wounded personnel. The mechanisms by which these consequences develop are complex but include an imbalance of the immune system leading to robust inflammatory responses, triggered by the presence of damage-associated molecules and other immune-modifying agents following trauma. Treatment strategies to improve outcomes have been difficult to develop as the immunophenotype of injured personnel following trauma is variable, fluid and difficult to determine. As more information regarding the triggers that lead to immune dysfunction following trauma is elucidated, it may be possible to identify the immunophenotype of injured personnel and provide targeted treatments to reduce the late consequences of trauma, which are known to lead to significant morbidity and mortality.

Armours for soft bodies: how far can bioinspiration take us?

The development of armour is as old as the dawn of civilization. Early man looked to natural structures to harvest or replicate for protection, leaning on millennia of evolutionary developments in natural protection. Since the advent of more modern weaponry, Armor development has seemingly been driven more by materials research than bio-inspiration. However, parallels can still be drawn between modern bullet-protective armours and natural defensive structures. Soft armour for handgun and fragmentation threats can be likened to mammalian skin, and similarly, hard armour can be compared with exoskeletons and turtle shells. Via bio-inspiration, it may be possible to develop structures previously un-researched for ballistic protection. This review will cover current modern ballistic protective structures focusing on energy dissipation and absorption methods, and their natural analogues. As all armour is a compromise between weight, flexibility and protection, the imbricated structure of scaled skin will be presented as a better balance between these factors.

Epidemiological patterns of traumatic musculoskeletal injuries and non-traumatic disorders in Japan Self-Defense Forces

Background

The epidemiological patterns of musculoskeletal injuries or disorders in military personnel have not been well documented and a better understanding is required for proper preventative measures and treatment. Here, we investigated musculoskeletal injuries or disorders among members of the Japan Self-Defense Forces.

Methods

All orthopedic patients (n = 22,340) who consulted to Japan Self-Defense Forces Hospitals were investigated for their type of injury or disorder, the injured body part, the mechanism, and the cause of injuries.

Results

Thirty-nine percent of the cases were classified as traumatic injuries, and 61% were classified as non-traumatic disorders. Of the traumatic injury patients, the injured body part was the upper extremity in 32%, the trunk in 23%, and the lower extremities in 45% of the cases. The most common injured body location was the knee followed by the hand/finger and ankle. Exercise was the most common cause of injury, followed by traffic accident and military training.

Contusions were the most common traumatic injuries, followed by sprains and fractures. Of non-traumatic disorders, the lower extremities were reported as the injured part in 43% of the disorders. Lumbar spine disorders were the most common non-traumatic disorders, followed by tendon and joint disorders.

Conclusions

Over one-third of orthopedic cases among members of the Japan Self-Defense Forces are traumatic injuries, with the knee being the body part most commonly injured and exercise being the leading cause of injury.

Musculoskeletal Injuries in Iraq and Afghanistan: Epidemiology and Outcomes Following a Decade of War

The combined wars in Afghanistan and Iraq represent the longest ongoing conflicts in American military history, with a combined casualty estimate of >59,000 service members. The nature of combat over the last decade has led to precipitous increases in severe orthopaedic injuries, including traumatic amputations and injuries to the spine. Nearly 75% of all injuries sustained in combat now are caused by explosive mechanisms, and fractures comprise 40% of all musculoskeletal injuries. Injuries to the axial skeleton are more frequent among personnel exposed to combat, and spinal trauma is identified in nearly 40% of those killed. Musculoskeletal injuries are expensive and generate some of the highest rates of long-term disability. Noncombat musculoskeletal injuries are endemic within deployed military service members and occur at a greater than threefold rate compared with combat musculoskeletal injuries. Service members with musculoskeletal injuries or behavioral health conditions, such as posttraumatic stress disorder, depression, and psychosis, and those occupying a low socioeconomic status, have an increased risk of inferior outcomes.

Extremity injuries in soldiers during the conflict in Mali: experience of Togo Level two Hospital

PURPOSE

The aim of this study was to analyse war-related and non-war-related extremity injuries in soldiers in the Mali conflict.

MATERIALS AND METHODS

This prospective study was performed from 1 May 1 to 31 December 2014. It concerned extremity injuries in soldiers treated at Togo Level 2 Hospital.

RESULTS

Seventy-nine patients with an average age of 31.19 years were assessed. Among them, 50 were admitted after war injury and 29 from nonwar injury. Most war-related injuries were due to improvised explosive devices (IEDs) (36 %); road traffic accidents (51.72 %) were the main mechanism of non-war injury. A total of 125 injuries were analysed. Limb fractures were identified in 37 patients (29.6 %), and 22 cases (59.46 %) were open fractures. Twenty-six (20.8 %) patients had soft tissue wounds. The other injuries were sprains (18.4 %), muscle contusions (15.2 %), dislocations (8.8 %), traumatic amputations (4 %) and burns (3.2 %). Surgical debridement and external fixator application were the most frequently performed surgical procedures. Thirty-nine per cent of patients were evacuated to a level 3 hospital for better care.

CONCLUSION

The severity of injuries and their rapid treatment require orthopaedic surgeons to have high levels of surgical experience and knowledge pertaining to military or disaster surgical doctrine.

Regenerative medicine applications in combat casualty care

The purpose of this report is to describe regenerative medicine applications in the management of complex injuries sustained by service members injured in support of the wars in Afghanistan and Iraq. Improvements in body armor, resuscitative techniques and faster transport have translated into increased patient survivability and more complex wounds. Combat-related blast injuries have resulted in multiple extremity injuries, significant tissue loss and amputations. Due to the limited availability and morbidity associated with autologous tissue donor sites, the introduction of regenerative medicine has been critical in managing war extremity injuries with composite massive tissue loss. Through case reports and clinical images, this report reviews the application of regenerative medicine modalities employed to manage combat-related injuries. It illustrates that the novel use of hybrid reconstructions combining traditional and regenerative medicine approaches are an effective tool in managing wounds. Lessons learned can be adapted to civilian care.

Enhanced casualty care from a Global Military Orthopaedic Teleconsultation Program

BACKGROUND

Since its advent, telemedicine has facilitated access to subspecialty medical care for the treatment of patients in remote and austere settings. The United States military introduced a formal orthopaedic teleconsultation system in 2007, but few reports have explored its scope of practice and efficacy, particularly in a deployed environment during a time of conflict.

METHODS

All teleconsultations placed to the orthopaedic service between April 2009 and December 2012 were obtained and retrospectively reviewed. Case files were abstracted and anatomical location of injury, type of injury, origin of consult (country or Navy Afloat), branch of service, and treatment recommendations, were recorded for descriptive analysis. The final result of the consult was also determined, with service members transported from the combat theatre or deployment location defined as medically evacuated. Instances where teleconsultations averted a medical evacuation were also documented as a separate outcome.

RESULTS

Over a 32-month period, 597 orthopaedic teleconsultations were placed, with the majority derived from Army (46%) and Navy (32%) personnel deployed in Afghanistan, Iraq, or with Navy Afloat. Approximately 51% of consults involved the upper extremity, including 197 hand injuries, followed by lower extremity (37%) and spine (7.8%) complaints. Fractures comprised over half of all injuries, with the hand and foot most commonly affected. The average response time for teleconsultations was 7.54h. A total of 56 service members required immediate evacuation for further orthopaedic management, while at least 26 medical evacuations were prevented due to the teleconsultation system.

CONCLUSIONS

The teleconsultation system promotes early access to orthopaedic subspecialty care in a resource-limited, deployed military setting. The telemedicine network also appears to mitigate unnecessary aeromedical evacuations, reducing healthcare costs, lost duty time, and treatment delays. These findings have important meaning for the future of telemedicine in both the military and civilian setting.

LEVEL OF EVIDENCE

IV.

Pelvic, spinal and extremity wounds among combat-specific personnel serving in Iraq and Afghanistan (2003-2011): A new paradigm in military musculoskeletal medicine

INTRODUCTION

Previous studies regarding musculoskeletal injuries sustained during war have been limited by a lack of specificity regarding wounds incurred by combat-specific personnel. This investigation endeavoured to develop a comprehensive catalogue of the extent of musculoskeletal trauma, as well as the frequency of distinct injuries, among soldiers possessing a single combat-specific specialty.

METHODS

The Department of Defense Trauma Registry (DoDTR) and the Armed Forces Medical Examiner System (AFMES) were queried for all individuals with the combat-specific designation of cavalry scout who sustained injuries during deployment between the years 2003 and 2011. This data was refined to include only those soldiers found to have injuries involving the spine, pelvis, or extremities. Soldier age, rank, injury location (Afghanistan or Iraq), injury scenario (combat vs. non-combat) and mechanism of wounding were recorded, as were injury-specific data. Statistical comparisons for categorical variables were made using the chi-square statistic.

RESULTS

Sixty-seven percent (n=472) of 701 cavalry scouts injured during deployment sustained one or more injuries to the musculoskeletal system. Mean age for the group was 25.9 (range 18-54) years and 3.3 musculoskeletal injuries were incurred on average per casualty. The majority of casualties occurred during combat and in the Iraq theatre. Sixty-nine percent (n=328) of musculoskeletal casualties were incurred following explosion, and 20% (n=94) occurred due to gunshot. No significant difference (p>0.05) was encountered for the risk of musculoskeletal injury by wound mechanism. Forty-six percent of all injuries involved the lower extremities, while 32% occurred in the upper extremities. Tibial fractures were the most common injury encountered (8%), while amputations comprised 11% of all wounds. Spinal cord injury occurred in 12% of all casualties and represented 4% of all musculoskeletal wounds.

CONCLUSIONS

This effort is among the first to combine complimentary data from the DoDTR and AFMES over a multi-year period in order to comprehensively catalogue musculoskeletal wounds sustained by combat-specific soldiers. This investigation highlights a 49% incidence of injuries involving the spine, pelvis, and/or extremities within a cohort of combat-specific soldiers. Elevated rates of amputations, spinal injuries, and pelvic trauma were also appreciated as compared to earlier reports.

Evaluation of military trauma system practices related to complications after injury

BACKGROUND

The Joint Theater Trauma System (JTTS) was developed with the vision that every soldier, marine, sailor, and airman injured on the battlefield would have the optimal chance for survival and maximum potential for functional recovery. In this analysis, we hypothesized that injury and complication after injury surveillance information diffusion through the JTTS, via the dissemination of clinical practice guidelines and process improvements, would be associated with improved combat casualty clinical outcomes.

METHODS

The current analysis was designed to profile different aspects of trauma system performance improvement, including monitoring of frequent posttraumatic complications, the assessment of an emerging complication trend, and measurement of the impact of the system interventions to identify potential practices for future performance improvement. Data captured from the Joint Theater Trauma Registry on patients admitted to military medical treatment facilities as a result of wounds incurred in Iraq and Afghanistan from 2003 to 2010 were retrospectively analyzed to determine the potential impact of complication surveillance and process improvement initiatives on clinical practice.

RESULTS

Developed metrics demonstrated that the surveillance capacity and evidence-based quality improvement initiatives disseminated through the JTTS were associated with improved identification and mitigation of complications following battlefield injury.

CONCLUSION

The Joint Trauma System enables evidence-based practice across the continuum of military trauma care. Concurrent data collection and performance improvement activities at the local and system level facilitate timely clinical intervention on identified trauma complications and the subsequent measurement of the effectiveness of those interventions.

LEVEL OF EVIDENCE

Epidemiologic study, level III.

Wartime spine injuries: understanding the improvised explosive device and biophysics of blast trauma

The improvised explosive device (IED) has been the most significant threat by terrorists worldwide. Blast trauma has produced a wide pattern of combat spinal column injuries not commonly experienced in the civilian community. Unfortunately, explosion-related injuries have also become a widespread reality of civilian life throughout the world, and civilian medical providers who are involved in emergency trauma care must be prepared to manage casualties from terrorist attacks using high-energy explosive devices. Treatment decisions for complex spine injuries after blast trauma require special planning, taking into consideration many different factors and the complicated multiple organ system injuries not normally experienced at most civilian trauma centers. Therefore, an understanding about the effects of blast trauma by spine surgeons in the community has become imperative, as the battlefield has been brought closer to home in many countries through domestic terrorism and mass casualty situations, with the lines blurred between military and civilian trauma. We set out to provide the spine surgeon with a brief overview on the use of IEDs for terrorism and the current conflicts in Iraq and Afghanistan and also a perspective on the biophysics of blast trauma.

Are spine injuries sustained in battle truly different?

BACKGROUND CONTEXT

The severity and prognosis of combat-related injuries to the spine and spine injuries sustained unrelated to direct combat have not been previously compared. Differences may have implications on tactics, treatment strategies, and directions for future research.

PURPOSE

Compare the severity and prognosis of battle and nonbattle injuries to the spine.

STUDY DESIGN

Retrospective study.

PATIENT SAMPLE

American military personnel who were injured in a combat zone and whose medical data were abstracted in the Joint Theater Trauma Registry (JTTR).

METHODS

The JTTR was queried using International Statistical Classification of Diseases, Ninth Revision codes to identify all individuals who sustained battle and nonbattle injuries to the neck, back, spinal column, or spinal cord in Operation Iraqi Freedom or Operation Enduring Freedom from October 2001 to December 2009. Medical records of all identified servicemembers were individually reviewed. Demographic information, including sex, age, military rank, date of injury, and final disposition, was obtained for all patients. Spinal injuries were categorized according to anatomic location, associated neurologic involvement, precipitating mechanism of injury (MOI), and concomitant wounds. These data points were compared for the groups battle spine injuries (BSIs) and nonbattle spine injuries (NBSIs).

RESULTS

Five hundred two servicemembers sustained a total of 1,834 battle injuries to the spinal column, including 1,687 fractures (92%), compared with 92 servicemembers sustaining 267 nonbattle spinal column injuries, with 241 (90%) fractures. Ninety-one BSI servicemembers (18% of patients) sustained spinal cord injuries (SCIs) with 41 (45%) complete SCIs, compared with 13 (14% of patients) nonbattle SCIs with six (46.2%) complete injuries (p=.92). The reported MOI for 335 BSI servicemembers (66.7%) was an explosion compared with one NBSI explosive injury. Eighty-four patients (17%) sustained gunshot wounds (GSWs) in battle compared with five (5.2%) nonbattle GSWs. Fifteen patients (3.0%) sustained a battle-related fall compared with 29 (30%) nonbattle-related falls. Battle spine injury servicemembers underwent significantly higher rates of surgical interventions (p<.0001), were injured by high-energy injury mechanisms at a significantly greater rate (p<.0001), and demonstrated a trend toward lower neurologic recovery rates after SCI (p=.16).

CONCLUSIONS

Battle spine injury and NBSI are separate entities that may ultimately have disparate long-term prognoses. Nonbattle spine injury patients, although having similar MOIs compared with civilian spinal trauma, maintain a different patient demographic. Further research must be directed at accurately quantifying the long-term disabilities of all spine injuries sustained in a combat theater, whether they are the result of battle or not.

Non-emergent orthopaedic injuries sustained by soldiers in Operation Iraqi Freedom

BACKGROUND

The majority of soldiers deployed to the theater of combat operations return safely after completion of the deployment. Many of these soldiers sustain non-emergent musculoskeletal injuries that initially are treated nonoperatively and ultimately require surgery following their combat tour.

METHODS

A prospective evaluation of the orthopaedic surgery consultations and surgical procedures required by soldiers returning from a full combat deployment was performed. Demographic information (including age and sex) as well as information on the mechanism of injury, the reason for orthopaedic consultation, and the procedures performed was collected for each soldier. The overall incidence of non-emergent orthopaedic injuries was calculated, and multivariate Poisson regression analysis was utilized to determine the effect of age and sex on the type of orthopaedic injury sustained.

RESULTS

There were 3787 soldiers who returned from combat operations at the end of a fifteen-month deployment without having been medically evacuated. There were 731 orthopaedic surgical consultations for the evaluation of a non-emergent musculoskeletal complaint, and 140 orthopaedic operations were performed as a result. An age of thirty years or more was an important risk factor for requiring an orthopaedic consultation (p < 0.0001). The most common surgical procedures were performed for shoulder stabilization, for superior labrum anterior to posterior lesion repair, for the treatment of internal derangement of the knee, and for the treatment of foot deformity.

CONCLUSIONS

Nineteen percent of all soldiers who completed a combat deployment required an orthopaedic surgical consultation on return, and 4% of soldiers required orthopaedic surgery. More than half of the surgical procedures involved the knee or shoulder. This represents a large burden of care for returning soldiers on orthopaedic surgical services and has important implications for future resource utilization.

Rapid Heterotrophic Ossification with Cryopreserved Poly(ethylene glycol-) Microencapsulated BMP2-Expressing MSCs

Autologous bone grafting is the most effective treatment for long-bone nonunions, but it poses considerable risks to donors, necessitating the development of alternative therapeutics. Poly(ethylene glycol) (PEG) microencapsulation and BMP2 transgene delivery are being developed together to induce rapid bone formation. However, methods to make these treatments available for clinical applications are presently lacking. In this study we used mesenchymal stem cells (MSCs) due to their ease of harvest, replication potential, and immunomodulatory capabilities. MSCs were from sheep and pig due to their appeal as large animal models for bone nonunion. We demonstrated that cryopreservation of these microencapsulated MSCs did not affect their cell viability, adenoviral BMP2 production, or ability to initiate bone formation. Additionally, microspheres showed no appreciable damage from cryopreservation when examined with light and electron microscopy. These results validate the use of cryopreservation in preserving the viability and functionality of PEG-encapsulated BMP2-transduced MSCs.

Lumbar spine fractures within a complete American cohort: epidemiology and risk factors among military service members

STUDY DESIGN

Retrospective database review.

OBJECTIVE

To describe the incidence of, and risk factors for, lumbar spine fractures within the population of the US military. SUMMARYOF BACKGROUND DATA: Fractures of the lumbar region are an important health concern; however, the epidemiology of this injury has not been extensively studied in the United States.

METHODS

International Classification of Diseases, Clinical Modification, Ninth Revision codes for lumbar spine fractures were used in a search of the Defense Medical Epidemiology Database, identifying all individuals who sustained such injuries between 2001 and 2010. The database was also used to obtain the complete number of individuals serving in the Armed Forces over the same time period. Information regarding race, rank, branch of service, sex, and age was obtained for all individuals identified as having lumbar spine fractures as well as for the whole military population. The incidence of lumbar spine fractures was determined for the cohort. Unadjusted incidence rates were derived for risk factors and multivariate Poisson regression analysis, controlling for all other risks, was used to obtain adjusted incidence rate ratios and identify statistically significant risks for lumbar fractures.

RESULTS

Between 2001 and 2010, the overall incidence of lumbar fractures was 0.38 per 1000 person-years. Male sex, white race, enlisted ranks, service in the Army and Marines, and age were found to be significant predictors of lumbar spine fracture. Service in the Army demonstrated the highest rate of lumbar fractures (0.48 per 1000 person-years).

CONCLUSIONS

This investigation is the first to document the incidence and postulate risk factors for lumbar spine fracture in an American population. In this study, males, whites, enlisted personnel, those serving in the Army and Marines, and individuals aged 20-24 or greater than 40 were found to be at an increased risk of lumbar fracture.