FSI Football Science Update


Is there association between cutting and jump-landing movement quality in semi-professional football players? Implications for ACL injury risk screening.
Olivares-Jabalera J, Fílter-Ruger A, Dos’Santos T, Ortega-Domínguez J, Sánchez-Martínez RR, Soto Hermoso VM, Requena B.
This study examined the relationship between the Landing Error Scoring System (LESS) of a drop vertical jump DVJ and the Cutting Movement Assessment Score (CMAS) of a 70° change of direction, in 42 male semi-professional soccer players. Both tools showed good reliability to evaluate movement quality, although evaluations should be preferably performed by the same observer. However, no significant associations were found among CMAS and LESS for either scores or risk profiles, showing that ACL injury risk profile’s is task-dependent, and both landings of the DVJ should be assessed as they represent different biomechanical and neuromuscular control deficits.


Anterior ankle impingment syndrome is less frequent, but associated with a longer absence and higher re-injury rate compared to posterior syndrome: a prospective cohort study of 6754 male professional soccer players.
D’Hooghe P, Waldén M, Hägglund M, Bengtsson H, Ekstrand J.
This epidemiology study on 6754 male professional soccer players of 120 European soccer teams over 18 consecutive seasons found that out of 25,462 reported injuries, 93 (0.4%) were diagnosed as anterior ankle impingement syndrome AAIS (38%) or posterior ankle impimgement syndrome PAIS (62%) in 77 players. Impingement syndromes resulted in an overall incidence of 0.03 injuries per 1000 h and an injury burden of 0.4 absence days per 1000 h. PAIS was more frequently reported than AAIS, but AAIS was associated with more absence days and a higher re-injury rate than PAIS.


Investigating the Knuckleball Effect in Soccer Using a Smart Ball and Training Machine.
Eager D, Ishac K, Zhou S, Hossain I.
Following the changes in the design of the soccer ball after the 2006 World Cup, knuckleball and ball aerodynamics were exploited by soccer players. In this study, the researchers designed and evaluated a system that could reproduce the knuckleball effect on soccer balls. The results from the testing showed that this system was successfully able to produce knuckleball behaviour on the football in a highly consistent manner, but the erratic and unpredictable trajectory obtained was much smaller in magnitude when compared to examples seen in professional games.


Prognostic factors of muscle injury in elite football players: A media-based, retrospective 5-year analysis.
Wilke J, Tenberg S, Groneberg D.
This study examined a public data register (Transfermarkt.com) to follow the time-loss muscle injuries sustained during five consecutive seasons (2014/2015 to 2018/2019) by 1148 elite players of 38 German and English first-division football clubs. A total of 1722 muscle injuries were observed in 619 players. History of general musculoskeletal injury (OR 5.3), playing position (OR 2.4-2.5), market value (OR 2.3), and history of muscle injury (OR 1.6) were associated with muscle injury.


Acceleration and deceleration demands during training sessions in football: a systematic review.
Silva H, Nakamura FY, Beato M, Marcelino R.
This review summarizes the current scientific knowledge about acceleration and deceleration demands during football training. Full-text articles of 42 studies were included in the final analysis. Lower acceleration and deceleration intensities occurred more often than higher intensities. Different exercises elicit different demands and small-sided games presented higher acceleration and deceleration demands than circuit training and other running based drills. Reducing or increasing the number of players in small-sided games increase or decrease demands, respectively. Wide playing positions, such as fullbacks, are generally exposed to higher acceleration and deceleration demands. Acceleration and deceleration demands in trainings decrease as match day approaches.


The injury mechanism correlation between MRI and video-analysis in professional football players with an acute ACL knee injury reveals consistent bone bruise patterns.
D’Hooghe P, Grassi A, Villa FD, Alkhelaifi K, Papakostas E, Rekik R, Marin T, Tosarelli F, Zaffagnini S.
This study on 19 professional football (soccer) players that sustained ACL injury while playing during an official match of First League Championship foud that the most commonly involved Bone Bruise areas in the knee at MRI were the Posterior Lateral Tibial Plateau (84%) and the Central Lateral Femoral Condyle (58%). 82% of athletes with this «Typical» pattern occurred with a «Pivoting» action, and the most common situational mechanism pattern on video analysis was «pressing». Heterogeneous patterns of bone bruise were present in injury mechanisms with direct contact or involving high horizontal velocity.