Major League Soccer Research Articles

Local Broadcast Viewership in Major League Soccer

This paper estimates determinants of local market television viewership demand for Major League Soccer (MLS). We examine the effects of team quality and outcome uncertainty and compare our estimate...

Head Injury in Soccer: From Science to the Field; summary of the head injury summit held in April 2017 in New York City, New York

There has been an increased focus and awareness of head injury and sport-related concussion (SRC) across all sports from the medical and scientific communities, sports organisations, legislators, the media and...

A Market Test for Ethnic Discrimination in Major League Soccer

Abstract: This paper tests for salary discrimination based on player ethnicities in Major League Soccer (MLS) with a market model. Particular focus is paid to Club Deportivo Chivas USA, which was operated by owners of a Mexican team that explicitly excludes non-Mexicans from their roster, Club Deportivo Guadalajara. Evidence of wage discrimination in MLS is found and the model is used to estimate how much of Chivas USA’s poor performance was due to discrimination.

There is a high return to sport rate but with reduced career lengths after Achilles tendon repair in Major League Soccer players

ObjectivesTo determine (1) return to sport (RTS) rate in Major League Soccer (MLS) players following Achilles tendon repair, (2) postoperative career length and games per season, (3) preoperative and postoperative performance, and (4) postoperative performance compared with control players matched by position, age, body mass index, sex, years of experience and performance.MethodsPublicly available records were used to identify MLS players who underwent Achilles tendon repair with a minimum of 1 year follow-up. Demographic and performance data were collected for each player. Matched controls were identified. RTS was defined as playing in one or more MLS games after surgery. Comparisons between case and control groups and preoperative and postoperative time points were made using paired sample Student’s t-tests.ResultsTwenty-two players (mean age 28.4±4.0 years; mean 3.0±2.2 years follow-up) and 23 Achilles tendon repairs (one bilateral repair) were analysed. Seventeen players (18 Achilles tendon repairs; 77.3%) were able to RTS in the MLS at mean 306.6±199.2 days. Players who RTS after repair had shorter careers than matched controls (2.5±2.2 vs 4.5±3.0 seasons, respectively; p=0.021). Additionally, players who RTS after repair played in fewer games per season than matched controls (13.4±8.4 vs 23.2±6.5, respectively; p<0.001). There was no significant decrease in performance postsurgery compared with presurgery.ConclusionThere is a 77.3% RTS rate in the MLS following Achilles tendon repair. Following repair, players had shorter careers and played fewer games per season than matched controls. There was no significant decrease in performance postsurgery compared with presurgery nor in postsurgery compared with postindex. A significantly greater number of Achilles tendon tears occurred in the left versus the right lower extremity.Level of evidenceLevel III.

Choice Overload and Partial Season Ticket Sales

This study utilizes a consumer choice experiment to assess if choice overload exists with partial season ticket packages of a Major League Soccer (MLS) team. Individuals were randomly assigned to one of three conditions with an increasing number of partial season ticket options. Study results indicate as the number of options available increases, buyers are more likely to feel the decision-making process was difficult and regret the decision they made. However, participants were generally satisfied to be afforded so many options, and increasing the number of ticket plan options did not appear to affect purchase intent or potential purchase satisfaction. Subscribe to JASM

Determinants of Attendance in Major League Soccer

This study examines the determinants of Major League Soccer team attendance during the league’s recent era of growth. Estimates indicate that regular-season on-field performance is positively associated with attendance, but the returns to success are diminishing. Positive novelty effects are identified for newer teams and soccer-specific stadiums but not for stadium age. Income is positively associated with attendance, indicating that MLS matches are a normal good. Population size, the Hispanic share of population, the presence of other major-league franchises, and the number of designated players on a team do not appear to be strong determinants of seasonal attendance.

An industry test for ethnic discrimination in major league soccer

ABSTRACTThis paper tests for salary discrimination based on player ethnicity in Major League Soccer (MLS) by making innovative use of player movements in a unique setting. The discriminating team investigated is Club Deportivo Chivas USA, which had a preference for employing Hispanic players. Evidence of discrimination is found by analyzing how other teams valued the former players of Chivas USA differently across ethnicity after the team was disbanded by the league. The nature of MLS player contracts and drafting rules allow for a simple and unique test for salary discrimination that has not previously been possible to implement.

The gaps of concussion policy in soccer: A visual review

Concussion evaluation and treatment has been widely less widely publicized in soccer vs American football. However, a recent assessment found that in the previous FIFA World Cup in 2014, 63% of events when players involved in head collisions were not assessed by sideline healthcare personnel within the 64 matches of the tournament. The upcoming 2018 FIFA World Cup should be approached with a more critical eye in order to improve the rate of concussion assessment in head collisions. US Soccer National Team's Concussion policy “players who are suspected of having sustained a concussion shall be removed from play immediately and evaluated by team medical staff.” Not all head collisions are required to be examined and a physician is not required to perform the sideline evaluation. Since the start of the 2018 Major League Soccer season, at least 2 incidents of concussion diagnosis were instances which an initial evaluation allowed the player to return to play when a concussion diagnosis was made later. A detailed examination of professional soccer both on the American and World stage exposes gaps in concussion policy that must be addressed to improve the approach to athlete brain health.

Professional Soccer Players' Return to Play and Performance After Operative Repair of Achilles Tendon Rupture.

Background:The majority of Achilles tendon ruptures are sports related; however, no investigation has examined the impact of surgical repair for complete ruptures on professional soccer players.Purpose:To examine the return to play, playing time, and performance of professional soccer players following Achilles tendon repair.Study Design:Cohort study; Level of evidence, 3.Methods:Union of European Football Associations (UEFA) and Major League Soccer (MLS) athletes who sustained a primary complete Achilles tendon rupture and were treated surgically between 1988 and 2014 were identified via public injury reports. Demographic information and performance-related statistics for the identified athletes were recorded for the season before surgery and 2 seasons after surgery and were compared with information for matched controls. Statistical analyses were used to assess differences in recorded metrics.Results:A total of 24 athletes with Achilles ruptures met inclusion criteria, 17 (70.8%) of whom were able to return to play. On average, players had 8.3 years of professional-level experience prior to sustaining an Achilles rupture. Among athletes who returned to play, no differences were found in the number of games played or started, minutes played, or goals scored 1 year postoperatively compared with the year prior to injury. However, 2 years postoperatively, these athletes played 28.3% (P = .028) fewer minutes compared with their preoperative season, despite starting and playing in an equivalent number of games. Matched controls had baseline playing time and performance statistics similar to those of players. However, controls played and started in significantly more games and played more minutes at 1 and 2 years compared with players (P < .05). No differences were found in goals scored at any time point.Conclusion:This is the first investigation examining the effect of an Achilles repair on the career of professional soccer players. This is a difficult injury that most commonly occurs in veteran players and prevents 29.2% of players from returning to play despite surgical management. Additionally, athletes able to return to play were found to play fewer minutes 2 years postoperatively compared with their baseline as well as playing less at 1 and 2 years postoperatively compared with uninjured matched controls. The reduction in playing time following an Achilles repair has significant implications for professional players and teams.

A Prospective Analysis of Competitive Balance Levels in Major League Soccer

This study introduces a graphical methodology to the analysis of competitive balance in sports, which is prospective in nature and captures more subtleties than commonly-used retrospective measures. Thus, this study examines the evolution of competitive balance in Major League Soccer from 2004 to 2015, including the potential role played by certain league policies. For this purpose, we use prospective measures, based on probabilities that are extracted from betting odds (ex-ante) and on retrospective indicators (ex-post). The results differ slightly when analyzing competitive balance and predicting attendance. However, the graphical measures provide additional practical information about the characteristics of competitive balance.

Return to Play After Anterior Cervical Discectomy and Fusion in Professional Athletes.

Background:Data are limited on return to play after anterior cervical discectomy fusion (ACDF) in professional athletes.Purpose:To determine the rate and time of return to play among professional athletes after ACDF.Study Design:Case series; Level of evidence, 4.Methods:This study involved the prospective and retrospective review of patient charts and diagnostic studies as well as an internet search to collect data on a consecutive series of professional athletes who underwent cervical fusion by 1 of the 2 senior authors between 1982 and 2016. Demographic data included sport, preoperative symptoms and radiologic findings, date of surgery, level of surgery, postoperative symptoms and radiologic findings, and confounding factors (eg, other orthopaedic injuries). An internet search engine was used to determine date of return to play and length of career after surgery.Results:A total of 27 ACDFs were performed on 26 professional athletes: 12 National Football League athletes, 5 National Hockey League athletes, 5 Major League Baseball athletes, 3 National Basketball Association athletes, and 1 Major League Soccer athlete. Twenty-six procedures (96.3%) showed clinical and radiographic evidence of fusion, and 20 of 25 eligible players returned to play (80%). At the conclusion of this study, 2 players were still in the rehabilitation phase and expected to return at the start of the next National Football League season. The mean time to return to play in a professional game was 9.5 months (range, 5.0-20.2 months). Of 15 players who returned to play but had retired by the time of this study, the mean career length after fusion was 3.2 years (range, 0.1-8.0 years). Clinical follow-up ranged from 1 to 96 months, with a mean of 22.1 months and mode of 11 months.Conclusion:After single-level ACDF, 80% of professional athletes were able to return to sport at approximately 9 months. The study findings will help athletes, physicians, and teams better predict outcome after ACDF surgery.

Recycling Steel: football, tradition, and historicity in Pennsylvania

ABSTRACTOn 19 August 2015, the Philadelphia Union of Major League Soccer announced plans to sponsor an expansion team in the second-tier United Soccer League. Two months later, an enthusiastic crowd filed into the historic Bethlehem Steel plant in eastern Pennsylvania to witness the new side’s unveiling. Against the backdrop of towering blast furnaces that evoked the region’s industrial golden age, Union representatives heralded the return of Bethlehem Steel Football Club. This paper explores the nexus of past and present in the recycling of Steel. Juxtaposing the modern club’s retro-themed kit against the identity of its storied namesake, it argues that the past is simultaneously honoured and obscured. In so doing, it situates the recycling of Steel in its broader historical context, paying attention to the business ambitions of Union executives, the cultural penchant for heritage branding and the efforts of a once-vibrant manufacturing town to negotiate the realities of a postindustrial landscape.

Defining Platelet-Rich Plasma Usage by Team Physicians in Elite Athletes.

Background:The indications for the use of platelet-rich plasma (PRP) are vaguely defined despite the frequency of its use as a treatment for athletes. While select studies have advocated for its efficacy, the majority of orthopaedic research conducted on the topic has been equivocal.Purpose:To define the use of PRP in elite athletes by team physicians from professional sports leagues.Study Design:Cross-sectional study.Methods:A survey assessing treatment timing, usage patterns, indications, and complications was generated by fellowship-trained sports medicine orthopaedic surgeons. The survey was distributed to team physicians from the National Football League, National Basketball Association, Major League Baseball, National Hockey League, Major League Soccer, and the “Power 5” Division I conferences of the National Collegiate Athletic Association. From a compilation of publicly available email addresses and those available from professional team physician associations, 149 team physicians were sent this PRP assessment tool.Results:Of the 149 professional and collegiate team physicians contacted, 59 started the survey and 46 completed it, resulting in a 39.6% participation rate and a 30.9% completion rate. Approximately 93% of physicians stated that they use PRP in their practices, and 72% use ultrasonography for injection guidance. On average, collegiate team physicians and National Football League physicians treated the most players per season with PRP (69.4 and 60.4 players, respectively), while National Hockey League physicians treated the fewest (18.0 players). The majority of respondents reported no complications from PRP injections (70%), with pain being the most common complication reported (26%). There was no consensus on the most important aspect of PRP formulation, with the top 2 responses being platelet concentration (48%) and white blood cell concentration (39%). When grading the importance of indications to use PRP, physicians found athlete desire on average (7.5 ± 2.2 [SD]; out of 10) to be more important than reimbursement (2.2 ± 2.2) (P < .001). Importantly, physicians stated that they moderately (5.4 ± 2.3) believed in the evidence behind PRP. Physicians listed hamstring injuries as the most common injury treated with PRP. Hamstring injuries were treated with a mean 3.14 PRP injections, as opposed to 2.19 injections for nonhamstring injuries.Conclusion:Professional and collegiate team physicians frequently use PRP despite a lack of consensus regarding the importance of the formulation of the product, the timing of treatment, and the conditions that would most benefit from PRP treatment.

Role Strain, Part 1: Experiences of Athletic Trainers Employed in the Professional Sports Setting

The demands and expectations of athletic trainers employed in professional sports settings (ATPSSs) have increased over the years. Meeting these demands and expectations may predispose the athletic trainer to workplace stress and ultimately role strain. To investigate the concept of role strain among ATPSSs. Sequential, explanatory mixed-methods study consisting of 2 phases: (1) population role-strain survey and (2) personal interviews. From a purposeful sampling of 389 athletic trainers employed in the 5 major sports leagues (Major League Baseball, Major League Soccer, National Basketball Association, National Football League, and National Hockey League), 152 individuals provided usable data (39% response rate). A previously validated and reliable role-strain survey using a 5-point Likert scale (1 = never, 5 = nearly all the time) was administered. Measures of central tendency were used to identify the presence and degree of role strain; inferential statistics were calculated using analysis of variance to determine group differences in overall role strain and its subcomponents. More than half of the participants (53.9%) experienced a moderate to high degree of role strain. Interrole conflict (2.99 ± 0.77) and role overload (2.91 ± 0.75) represented the most prominent components of role strain. Differences existed by sport leagues and employment. Role strain existed at moderate to high levels (mean Role Strain Score > 2.70) among ATPSSs. Interrole conflict and role overload contributed the most to overall role strain. The ATPSSs experienced role strain to a higher degree than reported in other settings.

Role Strain, Part 2: Perceptions Among Athletic Trainers Employed in the Professional Practice Setting.

Athletic trainers (ATs) employed in the professional sport setting (ATPSSs) demonstrate moderate to high degrees of role strain. The experiences and perceptions of these ATs provide insight regarding the sources of role strain as well as ways to reduce it. To investigate the perceptions of ATPSSs regarding role strain. Qualitative study. From a purposeful sampling of 389 ATs employed in the 5 major sport leagues (Major League Baseball, Major League Soccer, National Basketball Association, National Football League, and National Hockey League), we identified 34 participants willing to participate in phone interviews. Data Collection and Procedures: Semistructured phone interviews. Inductive data analysis was based on a grounded theory approach. Credibility was addressed with member checks and a peer debriefing. Three first-order emergent themes materialized from the data: (1) sources of role strain, (2) consequences of role strain, and (3) strategies to alleviate role strain in ATPSSs. Participants described the antecedents of role strain as emerging from the competing expectations of the professional athlete, the organization, and the sport league. Consequences of role strain included effects on direct patient care and work-life imbalance. Improving organizational factors such as inadequate staffing and poor communication within the organization were strategies described by participants for decreasing role strain in the professional sports setting. Our participants discussed experiencing role strain, which was facilitated by trying to meet the competing demands placed on them with limited time and often with an inadequate support staff. Participant role strain affected health care and contributed to work-life imbalance. Participants described changing the organizational factors that contributed to role strain as a strategy to alleviate the perceived stress.

Career Length and Injury Incidence After Anterior Cruciate Ligament Reconstruction in Major League Soccer Players.

Background:Little is known about career length after anterior cruciate ligament (ACL) reconstruction in Major League Soccer (MLS), the top men’s professional soccer league in the United States. Further, it is unspecified whether athletes returning to soccer after ACL reconstruction are at a higher risk for injuries, beyond new knee injuries.Purpose:To examine career length and the incidence of lower extremity injuries in MLS athletes after ACL reconstruction in comparison with age-matched controls.Study Design:Cohort study; Level of evidence, 3.Methods:Injuries and athletic exposures (AEs; games and training sessions) were recorded in the HealtheAthlete database, the injury surveillance system of MLS. All athletes who had undergone ACL reconstruction and returned to MLS were identified and age-matched with controls. Multivariate analyses of variance were used to compare career length and percentage of regular/postseason games that athletes started, substituted, or did not play. Generalized linear model regressions were used to examine the injury risk.Results:Athletes in the ACL group had shorter careers (1.3 ± 1.3 years) than those in the control group (2.5 ± 1.3 years) (P < .01), but while they were playing, athletes in the ACL group participated in a similar number of AEs as those in the control group (169.9 ± 129.0 vs 171.6 ± 124.9 AEs, respectively; P = .95). Athletes in the ACL group started fewer regular/postseason games (36.7% ± 34.3% vs 60.1% ± 33.8%, respectively; P < .01) and did not play in more regular/postseason games (47.4% ± 35.5% vs 31.0% ± 34.4%, respectively; P = .03) compared with those in the control group. The ACL group was not at a significantly greater risk for lower extremity injuries compared with the control group (relative risk, 0.87; 95% CI, 0.55-1.37).Conclusion:Although MLS athletes after ACL reconstruction are not at a greater risk for lower extremity injuries, this study suggests that they are not utilized in regular/postseason games as frequently and that their careers in MLS are shorter than age-matched controls. Further research is necessary to elucidate reasons for these athletes’ shortened MLS careers. This study supports the view of return to sport not as a single time point but as a continuum from return to participation to return to play and return to performance.

Predicting Attendance at Major League Soccer Matches: A Comparison of Four Techniques

Predicting Attendance at Major League Soccer Matches: A Comparison of Four Techniques

Estimation of game-level attendance in major league soccer: Outcome uncertainty and absolute quality considerations

Despite its continued growth, there are doubts about the sustainability of demand for Major League Soccer, which has a strong focus on superstar externalities through its designated player rules. Yet there is relatively limited research directly focusing on classical determinants of demand for league attendance. The authors set out to establish an estimate of the relative importance of relative quality – outcome uncertainty – and absolute quality in game attendance. They find that fans behave in ways more consistent with the loss aversion hypothesis than the uncertainty of outcome hypothesis, with considerable interest in both home and away team absolute quality.

The genesis of team rivalry in the New World: sparks to fan animosity in Major League Soccer

While rivalry debates rage among soccer fans and the media, scholars have focussed much of their research on clashes between specific clubs that share a considerable history of competition. Yet, historical conflict is just one of several elements that contribute to enduring sports rivalries, and several soccer teams – particularly in America and Canada – have limited history but salient rivals. This study compares the intensity of rivalries within Major League Soccer through a league-wide fan survey that also measures the importance of eleven antecedents to rivalry and how these elements are associated with fans’ negative reactions to rivals. While geography and frequency of play are the two most important rivalry antecedents according to fans, elements of bias such as cultural difference and unfairness are more closely associated with fans’ schadenfreude and relationship discrimination against rivals. Quotes from fans aligned with the most intense rivalries in MLS illustrate these findings.

Salary differences under the salary cap in Major League Soccer

Professional soccer is the world’s most popular sport; a number of National Leagues are under the control of National Associations. The economic theory behind soccer is the continuing competition to earn much more than other sports do in the sports market. Since the supply of talent is limited, teams’ demand for certain professionals is so strong that it leads to salary differences between players. Therefore, in this study, attention is given to the determinants of the differences in workers’ salaries in the Major League Soccer labor market using Generalized Least Squares (GLS) estimation on panel data from 2007 to 2016. Birth place is the most influential determinant of a player’s salary, along with a player’s position, a player’s age, whether the player has a national team duty, and the number of games in which the player started in the first eleven. Conversely, moving from one Major League Soccer team to another and the number of games played as a substitute have a negative effect on players’ salaries.