The impact of tackle football injuries on the American healthcare system with a neurological focus

Propranolol treatment during repetitive mild traumatic brain injuries induces transcriptomic changes in the bone marrow of mice

Introduction

There are 1.5 million new mild traumatic brain injuries (mTBI) annually in the US, with many of the injured experiencing long-term consequences lasting months after the injury. Although the post injury mechanisms are not well understood, current knowledge indicates peripheral immune system activation as a causal link between mTBI and long-term side effects. Through a variety of mechanisms, peripheral innate immune cells are recruited to the CNS after TBI to repair and heal the injured tissue; however, the recruitment and activation of these cells leads to further inflammation. Emerging evidence suggests sympathetic nervous system (SNS) activity plays a substantial role in the recruitment of immune cells post injury.

Methods

We sought to identify the peripheral innate immune response after repeated TBIs in addition to repurposing the nonselective beta blocker propranolol as a novel mTBI therapy to limit SNS activity and mTBI pathophysiology in the mouse. Mice underwent repetitive mTBI or sham injury followed by i.p. saline or propranolol. Isolated mRNA derived from femur bone marrow of mice was assayed for changes in gene expression at one day, one week, and four weeks using Nanostring nCounter® stem cell characterization panel.

Results

Differential gene expression analysis for bone marrow uncovered significant changes in many genes following drug alone, mTBI alone and drug combined with mTBI.

Discussion

Our data displays changes in mRNA at various timepoints, most pronounced in the mTBI propranolol group, suggesting a single dose propranolol injection as a viable future mTBI therapy in the acute setting.

American football is the youth sporting activity most commonly associated with acute vertebral fractures

OBJECTIVES

Athletics confer cardiovascular fitness and improved cognitive processing in pediatric populations. However, one risk of sports participation is acute vertebral fracture, an injury with significant morbidity. It is currently unknown which sports represent the highest risk of acute vertebral fracture in pediatric populations. This study seeks to identify the youth sporting activities most commonly associated with acute vertebral fractures presenting to United States (U.S.) emergency departments (EDs).

METHODS

This cross-sectional, retrospective study queries the National Electronic Injury Surveillance System database to report national weighted estimates and demographic characteristics of pediatric patients with acute vertebral fractures presenting to U.S. EDs.

RESULTS

The mean annual incidence of estimated acute vertebral fractures over the study period was 1,672 (C.I. 1,217-2,126). From 2000-2001 (N = 4,030; C.I. 2,934-5,125) to 2016-2017 (N = 2,559; C.I. 1,681-3,438), there was no significant change in the estimated rate of sports-related acute vertebral fractures in pediatric patients (p = 0.09). American football was identified as the sport most frequently associated with acute vertebral fractures (23.4%; C.I. 17.6-29.3%). We found no appreciable change in the rate of football-related acute vertebral fractures over time, with 48.2% (C.I. 37.3-59.0%) occurring from 2000 to 2008 and 51.8% (C.I. 41.0-62.7%) from 2009 to 2017.

CONCLUSIONS

While sports-related acute vertebral fractures remain rare injuries in pediatric populations, we identify youth football as the sport associated with the highest risk of such injuries. Despite decreasing football participation rates over our study period, the annual incidence of football-associated acute vertebral fractures has not exhibited a proportional decline. Our findings raise concern that the relative risk of acute vertebral fracture associated with youth football has not significantly decreased over time. Elimination of dangerous tackling technique, improvement in helmet fit and technology, and availability of on-site medical care may contribute to decreased estimates in the future.

Head and Neck Injury Patterns among American Football Players

IMPORTANCE

American football is a popular high-impact sport, leading to 2.7 million injuries in the United States annually. Recent evidence in football-related neurological damage has spurred national interest in player-safety. Football players injure their head and neck in up to 26% of total injuries. Variation in injury patterns between age groups and correlated hospitalizations for football-related head and neck injury has yet to be characterized.

OBJECTIVE

Our aim is to evaluate injury patterns among American-football related head and neck trauma.

METHODS

A retrospective cohort study of patients with football-related head and neck injury in the National Electronic Injury Surveillance System (NEISS).

RESULTS

Nearly 100 000 ED visits for football-related head and neck injuries occur annually. Males comprised 95% of patients, with a median age of 13. The head comprised 70% of injuries followed by the face (13%). The most common diagnoses were concussions (39%), internal organ injury (26%), and lacerations (11%). Pediatric patients were more likely to sustain concussions while adults experienced more lacerations (P < .05%). Fractures and nerve damage were rare injuries but caused a disproportionate share of hospitalizations.

CONCLUSION

Pediatric males are most likely to present for emergency care from football-related injury to the head and neck. Evaluating physicians can anticipate concussions, internal organ injury, and lacerations among presenting patients. Concussions, facial fractures, and nerve damage are injuries most likely to lead to hospitalization.

The cost of a single concussion in American high school football: a retrospective cohort study

Aim:

The potential financial burden of American football-related concussions (FRC) is unknown. Our objective was to describe the healthcare costs associated with an FRC and determine factors associated with increased costs.

Methodology/results:

A retrospective cohort study of concussed high school football players presenting between November 2017 and March 2020 was undertaken; 144 male high school football players were included. Total costs were about $115,000, for an average direct healthcare cost of $800.10/concussion. Visiting the emergency department (β = 502.29, 95% CI: 105.79–898.61; p = 0.01), the initial post-concussion symptom scale score (β = 0.39, 95% CI: 0.11–0.66; p = 0.01) and a post-concussion syndrome diagnosis (β = 670.37, 95% CI: 98.96–1241.79; p = 0.02) were each independently associated with total costs.

Conclusion:

A granular understanding of cost-driving factors associated with FRC is the first step in understanding the cost–effectiveness of prevention and treatment methods.

The healthcare costs, or the costs incurred by the healthcare system, associated with a single concussion in American high school football are unknown. We reviewed the records of 144 high school football players who received concussion care at our sport concussion center and calculated the direct healthcare costs associated with the appointments, imaging studies and therapies received, when applicable. We found that each concussion results in about $800 of healthcare system spending. A few factors were associated with greater costs, including visiting the emergency department and having symptoms for over 1 month. Furthermore, the more symptoms an athlete had at their first clinic visit, the higher total cost of care. Understanding these costs can potentially help clinicians and researchers determine the best ways to maximize care while minimizing the costs.

Side-to-side asymmetry in lower limb strength and hamstring-quadriceps strength ratio among collegiate American football players

[Purpose] The present study aimed to investigate the lower limbs injury risk factors that are based on conventional Hamstring to Quadriceps ratio and limb asymmetry index in varsity American football players. [Participants and Methods] Twenty-six varsity American football players aged 19–27 years and with 2.31 ± 1.29 years of American football experience from Dogu Akdeniz University volunteered to undergo measurements of average peak torque for isokinetic flexion and extension of dominant limb and non-dominant limb at 60°·s⁻¹ and 300°·s⁻¹. Hamstring to Quadriceps ratio and limb asymmetry index were also calculated for Hamstring and Quadriceps muscles. [Results] Statistical analysis revealed that dominant Quadriceps is stronger than non-dominant Quadriceps at 60°·s⁻¹ speed. No statistical difference was found between dominant and non-dominant Hamstring peak torque at 60°·s⁻¹ . Hamstring to Quadriceps ratio determined as normal both for 60°·s⁻¹ and 300°·s⁻¹according to the currently reported cut off value (H:Q ratio >60). Hamstring and Quadriceps limb asymmetry index also determined as normal (cut off value for LSI 10%) at 60°·s⁻¹. However, for both Hamstring and Quadriceps, side- to- side strength asymmetry at 300°·s⁻¹ was observed. [Conclusion] To prevent possible lower limb injury and to increase performance, varsity American football players who are actively training and competing might consider taking strength asymmetry into account to tailor their strength training program accordingly.