scholarly journals Youth Single-Sport Specialization in Professional Baseball Players

2020 ◽  
Vol 8 (3) ◽  
pp. 232596712090787
Author(s):  
Patrick S. Buckley ◽  
Michael C. Ciccotti ◽  
Meghan Bishop ◽  
Patrick Kane ◽  
Stephen Selverian ◽  
...  
Keyword(s):  
Athletic Trainers ◽  
The United States ◽  
Cross Sectional Study ◽  
Professional Baseball ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players ◽  
Current Trends ◽  
Youth Baseball ◽  
The Us

Background: An increasing number of youth baseball athletes are specializing in playing baseball at younger ages. Purpose: The purpose of our study was to describe the age and prevalence of single-sport specialization in a cohort of current professional baseball athletes. In addition, we sought to understand the trends surrounding single-sport specialization in professional baseball players raised within and outside the United States (US). Study Design: Cross-sectional study; Level of evidence, 3. Methods: A survey was distributed to male professional baseball athletes via individual team athletic trainers. Athletes were asked if and at what age they had chosen to specialize in playing baseball at the exclusion of other sports, and data were then collected pertaining to this decision. We analyzed the rate and age of specialization, the reasons for specialization, and the athlete’s perception of injuries related to specialization. Results: A total of 1673 professional baseball athletes completed the survey, representing 26 of the 30 Major League Baseball (MLB) organizations. Less than half (44.5%) of professional athletes specialized in playing a single sport during their childhood/adolescence. Those who reported specializing in their youth did so at a mean age of 14.09 ± 2.79 years. MLB players who grew up outside the US specialized at a significantly earlier age than MLB players native to the US (12.30 ± 3.07 vs 14.89 ± 2.24 years, respectively; P < .001). Additionally, MLB players raised in the US recalled a significantly higher incidence of sustaining an injury attributed to specializing in baseball than MLB athletes raised outside the US (27.7% vs 20.6%, respectively; P = .05). Conclusion: This study challenges the current trends toward early youth sport specialization, finding that the majority of professional baseball athletes studied did not specialize as youth and that those who did specialize did so at a mean age of 14 years. With the potential cumulative effects of pitching and overhead throwing on an athlete’s arm, the trend identified in this study toward earlier specialization within baseball is concerning.

scholarly journals Prevalence of Medial Ulnar Collateral Ligament Surgery in 6135 Current Professional Baseball Players: A 2018 Update

2019 ◽  
Vol 7 (9) ◽  
pp. 232596711987144 ◽  
Author(s):  
Devin P. Leland ◽  
Stan Conte ◽  
Nancy Flynn ◽  
Nicholas Conte ◽  
Ken Crenshaw ◽  
...  
Keyword(s):  
United States ◽  
Ulnar Collateral Ligament ◽  
The United States ◽  
Professional Baseball ◽  
Published Data ◽  
Collateral Ligament ◽  
Online Questionnaire ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players

Background: As the incidence of ulnar collateral ligament (UCL) surgery continues to rise rapidly, an update on the current prevalence and demographics in professional baseball players is warranted. Hypothesis: The prevalence of UCL reconstruction in Major League Baseball (MLB) and Minor League Baseball (MiLB) players will be higher than that previously reported, and the increase in prevalence will be most notable in MiLB pitchers. Study Design: Cross-sectional study; Level of evidence, 3. Methods: During the 2018 baseball season, an online questionnaire regarding a history of UCL surgery was distributed to the certified athletic trainers of all 30 MLB organizations. These trainers then administered the survey to all players within their organizations, including MLB, MiLB (AAA, AA, High A, Low A, High Rookie, Low Rookie), and Dominican Summer League (DSL) players. Demographics were compared between MLB, MiLB, and DSL players. Results of this 2018 survey were compared with previously published data from the 2012 season to assess the change over time. Results: There were 6135 professional baseball players who completed the survey (66% response rate). The prevalence of UCL reconstruction in all MLB and MiLB players was 13% (637/4928), while the prevalence in DSL players was 2% (20/1207) ( P < .001). The prevalence in all MLB and MiLB players (13%) and pitchers (20%) both increased significantly from 2012 ( P < .001). MLB pitchers reported a higher prevalence of UCL reconstruction than did MiLB pitchers (26% vs 19%, respectively; P < .001). In 2018, the prevalence of UCL reconstruction has increased significantly in MiLB pitchers (19% vs 15%, respectively; P < .001) and pitchers aged 21 to 30 years (22% vs 17%, respectively; P < .001) compared with 2012. Additionally, United States–born pitchers were more likely to have undergone UCL reconstruction compared with Latin America–born pitchers (23% vs 13%, respectively; P < .001). Conclusion: The prevalence of UCL reconstruction has increased significantly in professional baseball players over the past 6 years from 10% to 13%. Ultimately, the prevalence of UCL reconstruction has increased most significantly since 2012 in MiLB pitchers, pitchers aged 21 to 30 years, and pitchers born in the United States.

scholarly journals Prevalence and Consequences of Sport Specialization Among Little League Baseball Players

2021 ◽  
pp. 194173812097095
Author(s):  
Eric G. Post ◽  
Michael D. Rosenthal ◽  
Andrew T. Pennock ◽  
Mitchell J. Rauh
Keyword(s):  
Cross Sectional Study ◽  
Patient Reported Outcome ◽  
Online Questionnaire ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players ◽  
Little League ◽  
Patient Reported ◽  
Youth Baseball ◽  
Level 3

Background: Baseball is one of the most popular boy’s youth sports, and there has been a rise in the rates of certain overuse injuries among players. Specialization has been identified as a risk factor for overuse injury in high school athlete populations, but there is little understanding of the prevalence or consequences of sport specialization in Little League baseball players. Hypothesis: Sport specialization will be highly prevalent among Little League baseball players and specialization will be associated with worse throwing arm health. Study Design: Cross-sectional study. Level of Evidence: Level 3. Methods: A total of 246 Little League baseball players (male; N = 241; age, 9.5 ± 1.6 years) between 7 and 12 years old completed an anonymous, online questionnaire with their parent’s assistance. The questionnaire consisted of participant demographics and baseball participation information, including sport specialization status and the Youth Throwing Score (YTS), a valid and reliable patient-reported outcome measure for youth baseball players. Results: Only 29 (11.8%) players met the criteria for high specialization. Approximately one-third of all players (n = 77; 31.3%) reported participating in baseball year-round or receiving private coaching outside of their league (n = 81; 32.9%). Highly specialized athletes demonstrated worse scores on the YTS on average compared with low-specialization athletes (mean [SE]: 56.9 [1.6] vs 61.1 [1.2]; P = 0.01). Similarly, pitching in the previous year ( P < 0.01) or traveling overnight regularly for showcases ( P = 0.01) were associated with a worse score on the YTS. Conclusion: While the prevalence of high sport specialization was low among Little League baseball players, other behaviors associated with specialization such as year-round play and the receiving of private coaching were more common. Highly specialized Little League players demonstrated worse throwing arm health compared with low-specialization players. Clinical Relevance: Little League players and their parents may represent a potential target audience for dissemination campaigns regarding sport specialization.

scholarly journals Pitching Behaviors in Youth Baseball: Comparison With the Pitch Smart Guidelines

2021 ◽  
Vol 9 (11) ◽  
pp. 232596712110501
Author(s):  
Justin J. Greiner ◽  
Cameron A. Trotter ◽  
Brian E. Walczak ◽  
Scott J. Hetzel ◽  
Geoffrey S. Baer
Keyword(s):  
Negative Binomial ◽  
Negative Binomial Regression ◽  
High Volume ◽  
Cross Sectional Study ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players ◽  
Binomial Regression ◽  
Youth Baseball ◽  
Rate Ratios

Background: The Pitch Smart guidelines aim to limit youth baseball pitching behaviors associated with overuse injuries. Despite many youth baseball leagues being compliant with the guidelines, during tournaments, pitch count restrictions or guidelines are often not followed. Purpose: To perform a quantitative analysis of pitch counts in youth baseball players and evaluate compliance with regard to the Pitch Smart guidelines in the tournament setting. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Included in the analysis were 100 youth baseball teams that competed in the 8-and-under to 14-and-under age divisions during the 2019 tournament season. Pitching data were compared with the Pitch Smart guidelines. Violations were identified as (1) exceeding maximum daily pitch count, (2) inadequate rest between pitching events, and (3) pitching more than 1 event on the same day. Pitcher and game factors were analyzed for possible relationships to guideline violations using mixed-effects negative binomial regression models, with comparisons of violations using rate ratios (RRs). Results: Analysis included 1046 pitchers and 2439 games. There were 1866 total Pitch Smart guideline violations, with 48.6% of pitchers having at least 1 violation. Inadequate rest was the most common reason for violation, with noncompliance occurring in 43.3% of pitchers. The highest rate of any violation (0.32 per appearance) occurred in the 8-and-under age division. High-volume pitchers had increased violation rates in each category compared with low-volume pitchers ( P < .001). Violation rates were increased more than twice the rate when pitchers participated in ≥5 consecutive games without a rest day when compared with a single game (RR, 2.48; P < .001). Conclusion: Noncompliance with Pitch Smart guidelines in tournament settings occurred in more than 90% of teams and almost half of all pitchers. Factors associated with noncompliance included younger pitcher age, high-volume pitching, and pitching in multiple consecutive games. Education of tournament directors, coaches, parents, and athletes regarding pitching guidelines is warranted in order to limit the risk of injury.

scholarly journals Relationship Between Lower Limb Tightness and Practice Time Among Adolescent Baseball Players With Symptomatic Osgood-Schlatter Disease

2019 ◽  
Vol 7 (5) ◽  
pp. 232596711984797 ◽  
Author(s):  
Takuya Omodaka ◽  
Takashi Ohsawa ◽  
Tsuyoshi Tajika ◽  
Hiroyuki Shiozawa ◽  
Syogo Hashimoto ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Lower Limb ◽  
Cross Sectional Study ◽  
Tibial Tuberosity ◽  
Lower Limbs ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players ◽  
Ankle Joints ◽  
Practice Time

Background: Osgood-Schlatter disease (OSD) is characterized by traction apophysitis of the tibial tuberosity. Few studies on symptomatic and asymptomatic OSD have correlated findings with clinical examination. Purpose: To investigate the relationship between lower limb tightness and practice time among adolescent baseball players with symptomatic OSD. Study Design: Cross-sectional study; Level of evidence, 3. Methods: The study participants were 402 male baseball players (N = 804 knees) with a mean ± SD age of 10.9 ± 1.5 years (range, 7-14 years). Participant age, height, body weight, body mass index, practice time per week, range of motion of the hip and ankle joints, heel-buttock distance (HBD), and straight-legged raise angle were evaluated. Tibial tuberosity development, as assessed with ultrasonography, was classified into 4 stages: cartilaginous, apophyseal, epiphyseal, and bony. Knees that were classified as apophyseal or epiphyseal were investigated. Participants were divided into 3 groups: non-OSD, asymptomatic OSD, and symptomatic OSD. Results: Of 400 knees in the apophyseal and epiphyseal stages, 23 knees had asymptomatic OSD, and 11 had symptomatic OSD. Players with symptomatic OSD practiced for significantly longer than the non-OSD group ( P = .001) and asymptomatic OSD group ( P = .001). Players with symptomatic OSD also had a larger HBD ( P = .006) and smaller range of motion regarding internal rotation of hip ( P = .023) and dorsiflexion of the ankle ( P = .013) than the non-OSD group. Conclusion: Players with symptomatic OSD had longer practice times than the non-OSD and asymptomatic OSD players. Symptomatic OSD was also associated with tightness of the lower limbs as assessed by the HBD and range of motion in the hip and ankle joints.

scholarly journals Are Baseball Statistics an Appropriate Tool for Assessing Return to Play in Injured Pitchers? Analysis of Statistical Variability in Healthy Players

2021 ◽  
Vol 9 (11) ◽  
pp. 232596712110509
Author(s):  
Ayoosh Pareek ◽  
Chad W. Parkes ◽  
Alexey A. Leontovich ◽  
Aaron J. Krych ◽  
Stan Conte ◽  
...  
Keyword(s):  
Cross Sectional Study ◽  
Return To Play ◽  
Professional Baseball ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Statistical Measures ◽  
Minimum Number ◽  
Baseball Pitchers ◽  
Normal Variability ◽  
Statistical Metrics

Background: Basic pitcher statistics have been used to assess performance in pitchers after injury or surgery without being validated. Even among healthy pitchers, the normal variability of these parameters has not yet been established. Purpose: To determine (1) the normal variability of basic and advanced pitcher statistics in healthy professional baseball pitchers and (2) the minimum pitches needed to predict these parameters. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Publicly available data from the MLB Statcast and PITCHf/x databases were used to analyze MLB pitchers during the 2015 and 2016 seasons who recorded a minimum of 100 innings without injury. Basic and advanced baseball pitcher statistics were analyzed. The variability of each parameter was assessed by computing the coefficient of variation (CV) between individual pitchers and across all pitchers. A CV <10 was indicative of a relatively constant parameter, and parameters with a CV >10 were generally considered inconsistent and unreliable. The minimum number of pitches needed to be followed for each variable was also analyzed. Results: A total of 118 pitchers, 55 baseball-specific statistical metrics (38 basic and 17 advanced), and 7.5 million pitches were included and analyzed. Of the 38 basic pitcher statistics, only fastball velocity demonstrated a CV <10 (CV = 1.5), while 6 of 17 (35%) advanced metrics demonstrated acceptable consistency (CV <10). Release position from plate and velocity from the plate were the 2 most consistent advanced parameters. When separated by pitch type, these 2 parameters were the most constant (lowest CV) across every pitch type. Conclusion: We recommend against utilizing nonvalidated statistical measures to assess performance after injury, as they demonstrated unacceptably high variability even among healthy, noninjured professional baseball pitchers. It is our hope that this study will serve as the foundation for the identification and implementation of validated pitcher-dependent statistical measures that can be used to assess return-to-play performance after injury in the future.

scholarly journals Income-based inequalities in self-reported moderate-to-vigorous physical activity among adolescents in England and the United States: a cross-sectional study

2020 ◽  
Author(s):  
Shaun Scholes ◽  
Jennifer S Mindell
Keyword(s):  
Physical Activity ◽  
Low Income ◽  
Vigorous Physical Activity ◽  
The United States ◽  
Cross Sectional Study ◽  
High Income ◽  
Sectional Study ◽  
Cross Sectional ◽  
The Us ◽  
Low Income Households

Objective: Quantify inequalities in self-reported moderate-to-vigorous physical activity (MVPA) in England and the United States (US). Design: Population-based cross-sectional study. Participants: 4019 adolescents aged 11-15 years in England (Health Survey for England 2008, 2012, 2015) and 4312 aged 12-17 years in the US (National Health and Nutrition Examination Survey 2007-16). Main outcome measures: Three aspects of MVPA: (1) doing any, (2) average min/day (MVPA: including those who did none), and (3) average min/day conditional on participation (MVPA-active). Using hurdle models, we quantified inequalities (average marginal effects: AMEs) using the absolute difference in marginal means. Results: In England, adolescents in high-income households were more likely than those in low-income households to have done any formal sports/exercise in the last seven days (boys: 11%; 95% CI: 4% to 17%; girls: 13%; 95% CI: 6% to 20%); girls in high-income households did more than their low-income counterparts (MVPA: 6 min/day, 95% CI: 2 to 9). Girls in low-income households spent more time in informal activities than girls in high-income households (MVPA: 21 min/day; 95% CI: 10 to 33), whilst boys in low-income versus high-income households spent longer in active travel (MVPA: 21 min/week; 95% CI: 8 to 34). In the US, in a typical week, recreational activity was greater among high-income versus low-income households (boys: 15 min/day; 95% CI: 6 to 24 min/day; girls: 19 min/day; 95% CI: 12 to 27). In contrast, adolescents in low-income versus high-income households were more likely to travel actively (boys: 11%; 95% CI: 3% to 19%; girls: 10%; 95% CI: 3% to 17%) and do more. Conclusions: Policy actions and interventions are required to increase MVPA across all income groups in England and the US. Differences in formal sports/exercise (England) and recreational (US) activities suggest that additional efforts are required to reduce inequalities.

scholarly journals Gender Disparities of Heart Disease and the Association with Smoking and Alcohol Drinking Behavior Among the Middle-Aged and Older Population in the US and China, a Cross-Sectional Study of CHARLS and HRS Data

2021 ◽  
Author(s):  
Yifei Li ◽  
Yuanan Lu ◽  
Eric L. Hurwitz ◽  
Yanyan Wu
Keyword(s):  
Heart Disease ◽  
Gender Gap ◽  
Alcohol Drinking ◽  
Survey Design ◽  
Drinking Behavior ◽  
The United States ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Disease Etiology ◽  
The Us

Abstract Background Heart disease remains the leading cause of death globally with substantial variabilities in mortalities by gender and region. Smoking and alcohol drinking are known modifiable health behaviors associated with heart disease. This study aims to estimate the prevalence of heart disease and to examine the association with smoking and drinking behavior for men and women in the United States (US) and China. Methods This study utilized the Harmonized data from the US Health and Retirement Study (HRS) and the China Health and Retirement Longitudinal Study (CHARLS), which are sister surveys as part of the Gateway to Global Aging Data (https://g2aging.org/). We performed cross-sectional comparisons using the 2016 wave HRS and 2015 wave CHARLS data. Age was categorized into four groups (50–59, 60–69, 70–79, and 80 years or older) and smoking and drinking behavior were combined to neither, smoking only, drinking only and both behaviors. Weighted analyses were conducted to estimate the prevalence and prevalence ratios (PRs) of heart disease accounting for complex survey design. Results The overall prevalence of heart disease was higher in men (24.5%) than in women (20.6%) in the US. In contrast, women had higher prevalence (22.9%) than men (16.1%) in China. The prevalence of heart disease increased by age with increasing gender gap in the US, while in China, the highest prevalence was observed in the 70–79 age group and gender difference were more apparent before 80 years of age. Adjusting for socio-demographic variables and health conditions, smoking only was associated with a higher prevalence of heart disease in both countries and the associations were stronger among women (US: PR = 1.39, 95%CI: 1.26 to 1.54; China: PR = 1.49, 95%CI: 1.30 to 1.72) than among men (US: PR = 1.20, 95%CI: 1.04 to 1.38; China: PR = 1.37, 95%CI: 0.94 to 1.98). Conclusions Findings from this study will improve present understanding of heart disease etiology and provide essential insights for future prevention, treatment, and control. Better management of smoking behaviors by gender might be beneficial for reducing the burden of heart disease in both countries and worldwide.

scholarly journals Financial ties between leaders of influential US professional medical associations and industry: cross sectional study

BMJ ◽  
2020 ◽  
pp. m1505 ◽  
Author(s):  
Ray Moynihan ◽  
Loai Albarqouni ◽  
Conrad Nangla ◽  
Adam G Dunn ◽  
Joel Lexchin ◽  
...  
Keyword(s):  
Clinical Oncology ◽  
American Psychiatric Association ◽  
The United States ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Medical Associations ◽  
The Us ◽  
American Society ◽  
Financial Relationships

AbstractObjectiveTo investigate the nature and extent of financial relationships between leaders of influential professional medical associations in the United States and pharmaceutical and device companies.DesignCross sectional study.SettingProfessional associations for the 10 costliest disease areas in the US according to the US Agency for Healthcare Research and Quality. Financial data for association leadership, 2017-19, were obtained from the Open Payments database.Population328 leaders, such as board members, of 10 professional medical associations: American College of Cardiology, Orthopaedic Trauma Association, American Psychiatric Association, Endocrine Society, American College of Rheumatology, American Society of Clinical Oncology, American Thoracic Society, North American Spine Society, Infectious Diseases Society of America, and American College of Physicians.Main outcome measuresProportion of leaders with financial ties to industry in the year of leadership, the four years before and the year after board membership, and the nature and extent of these financial relationships.Results235 of 328 leaders (72%) had financial ties to industry. Among 293 leaders who were medical doctors or doctors of osteopathy, 235 (80%) had ties. Total payments for 2017-19 leadership were almost $130m (£103m; €119m), with a median amount for each leader of $31 805 (interquartile range $1157 to $254 272). General payments, including those for consultancy and hospitality, were $24.8m and research payments were $104.6m—predominantly payments to academic institutions with association leaders named as principle investigators. Variation was great among the associations: median amounts varied from $212 for the American Psychiatric Association leaders to $518 000 for the American Society of Clinical Oncology.ConclusionsFinancial relationships between the leaders of influential US professional medical associations and industry are extensive, although with variation among the associations. The quantum of payments raises questions about independence and integrity, adding weight to calls for policy reform.

scholarly journals Epidemiological Profiles of Foreign-Born and US-Born Hispanic Blood Donors in a Major Metropolitan Area in the United States

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Adelbert B. James ◽  
Cassandra D. Josephson ◽  
Marta I. Castillejo ◽  
George B. Schreiber ◽  
John D. Roback
Keyword(s):  
Blood Donors ◽  
Blood Donation ◽  
The United States ◽  
Cross Sectional Study ◽  
Foreign Born ◽  
Rates Of Return ◽  
Cross Sectional ◽  
Major Metropolitan Area ◽  
The Us ◽  
Donated Blood

Background. The explosive growth of Hispanics in the US makes this population a significant and untapped source for blood donation. Methods. A cross-sectional study was performed to evaluate blood donation behaviors and demographics of foreign-born and US-born Hispanic donors between 2006 and 2009 in metropolitan Atlanta, GA, USA. Bivariate analyses and multivariate logistic regression were used to assess factors associated with foreign-born donors. Results. 5,119 foreign-born and 11,841 US-born Hispanics donated blood. Foreign-born Hispanic donors were more likely than US-born donors to be blood group O (57.6% versus 52.0%; P<.001) and more frequent donors (2.2 versus 2.0; P<.001). Cuban-born donors had the highest rates of return donation (63.2%). In contrast, Mexicans, the most prevalent subpopulation among foreign-born Hispanic donors (31.8%), had the lowest rates of return donation (42.0%). Conclusions. The heterogeneity found among Hispanic donors in this study is valuable for the design of recruitment strategies to increase blood donations.

Site and Severity of the Increased Humeral Retroversion in Symptomatic Baseball Players

2016 ◽  
Vol 44 (7) ◽  
pp. 1825-1831 ◽  
Author(s):  
Yasuo Itami ◽  
Teruhisa Mihata ◽  
Koji Shibano ◽  
Kazuomi Sugamoto ◽  
Masashi Neo
Keyword(s):  
Cross Sectional Study ◽  
Mirror Image ◽  
3D Ct ◽  
Shoulder Injury ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Baseball Players ◽  
Elbow Injury ◽  
Humeral Retroversion ◽  
Dominant Side

Background: Humeral retroversion in baseball players is greater in the dominant shoulder than in the nondominant shoulder. However, the site and severity of the humeral rotational deformity remain unclear. Purpose: To evaluate the site of side-to-side differences in humeral retroversion in baseball players and the severity of these changes through 3-dimensional computed tomographic (3D CT) bone models. Study Design: Cross-sectional study; Level of evidence, 3. Methods: From 2008 to 2014, we studied 25 baseball players (12 pitchers, 13 fielders) who underwent surgery for throwing-related injuries (shoulder injury, 15 players; elbow injury, 10 players). The mean age (±SD) at the time of surgery was 20.0 ± 5.9 years. A reconstructed 3D CT model of the entire humerus was divided into 15 segments of equal height (overall mean, 21.4 ± 1.0 mm). The side-to-side difference in humeral retroversion in each segment was calculated by superimposing the model of the dominant side over the mirror-image model of the nondominant side. Results: The overall mean increase in humeral retroversion was 13.0° ± 6.2° on the dominant side. Significant side-to-side differences in retroversion were present throughout the humerus. The largest side-to-side difference in humeral retroversion was seen at the insertions of the internal rotator muscles (2.5° ± 4.3°) and around the proximal physis (2.5° ± 1.4°). At the insertions of shoulder capsule and rotator cuff tendons, the superior half of the humeral head was more retroverted than the inferior half ( P < .0001). The side-to-side difference in humeral retroversion was significantly greater in the pitchers (16.2° ± 5.1°) than in the fielders (10.0° ± 5.7°) ( P = .009), particularly at the proximal physis. Conclusion: Baseball players exhibited significant side-to-side differences in humeral retroversion at multiple sites throughout the humerus, including the proximal humerus near the epiphyseal plate and at the insertions of the internal rotator muscles, the middle of the humeral shaft, and the distal third of the humerus. Therefore, the increased humeral retroversion at multiple sites throughout the humerus needs to be considered when we perform physical examinations, provide treatment, or undertake biomechanical studies for any throwing-related injuries.

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