INJURY PREVENTION IN FOOTBALL
Written by Roald Bahr, Bahar Hassanmirzaei, Montassar Tabben, Mokhtar Chaabane, Souhail Chebbi, Raouf Nader Rekik, Ramadan Daoud, Yorck Olaf Schumacher, Karim Chamari, Qatar
23-Mar-2023
Category: Sports Medicine

Volume 12 | Targeted Topic - Sports Medicine in Padel | 2023
Volume 12 - Targeted Topic - Sports Medicine in Padel

– Written by Roald Bahr, Bahar Hassanmirzaei, Montassar Tabben, Mokhtar Chaabane, Souhail Chebbi, Raouf Nader Rekik, Ramadan Daoud, Yorck Olaf Schumacher, Karim Chamari, Qatar

 

INTRODUCTION

The bad news: Football, at all levels, carries a substantial risk of injury—some severe and some even career-threatening. The good news: Many injuries can be prevented—even the serious ones.

 

If you do nothing - what can you expect?

Typically, a team will suffer one injury every second match and one anterior cruciate (ACL) injury – a serious, career-threatening injury – every two seasons1. Male teams have had more injuries than females in the past2, but an unfortunate consequence of the rapid development of female football is that the injury risk also seems to catch up. Female players are also at a 3-4 greater risk of ACL injuries than men. Although the overall risk is somewhat lower in younger players, with growing athletes, it is important to be aware of apophysitis and other injuries to the growth plates.

As a practitioner, you need to be aware of the typical injury pattern in football. Figure 1 gives a good indication of what you can expect. Acute injuries dominate over overuse injuries. This pattern is also your guide to preventing injuries; acute knee (especially ACL), thigh (hamstrings), groin, and ankle injuries should be a priority, as Figure 1 clearly illustrates.

 

Can you do something about it?

Fortunately, there are also patterns to how injuries happen—they are often referred to as internal and external factors. Some external factors are difficult to control; football is a complex game with frequent player-to-player contact, which may cause an injury. Internal factors are player traits, such as strength or coordination. Some of these are related to injury risk—these can be trained to shrink injury risk3. Evidence shows that targeted exercise programs can prevent at least half of all sports injuries (e.g., FIFA11+, Knäkontrol)4-7. Specific exercises focusing on specific injury types show even better results: The Nordic Hamstring Exercise lowers the risk of hamstring muscle injuries by 57-70% and even more in players with a recent injury8. Another example is groin problems: The Adduction Strengthening Programme, based on a tailored eccentric exercise, reduces this risk substantially9.

Other factors also affect injury risk; field conditions, equipment, fitness and psychological factors are examples10. Many sports-related health problems, not just injuries, can be avoided if players and their coaching staff routinely adopt well-established health-promoting behaviors: healthy training patterns, healthy diet/sleep, managing anxiety and stress, and avoiding interventions that can cause more harm than good11

Injury prevention programs are effective—they reduce the risk of injury and shrink healthcare costs. In the next chapter, we describe what you can do to prevent injuries in your team.

 

EXERCISE-BASED INJURY PREVENTION PROGRAMS

Warm-up programs

Structured exercise programs prevent injuries in general. They are often designed to be used as warm-up programs; this makes it easier to include them in the team’s training routine.

One specific target for all programs designed for football is ACL injuries, for reasons outlined above. Excessive valgus stress to the knee is one of the major risk factors. So, controlling movements that cause excessive dynamic valgus of the knee is a key part of any ACL injury prevention program12,13.

FIFA (Fédération Internationale de Football Association) is promoting the FIFA 11+ program as a prevention program, targeting “the big 4”: the knee, hamstrings, groin, and ankle6. The 11+ program combines a series of 15 structured warm-up exercises (see Figure 2): core stabilization, eccentric thigh muscle training, proprioceptive training, dynamic stabilization, and plyometric exercises. Each of the strength, plyometrics, and balance exercises has three levels of challenge to allow players to progress. Performing these with proper postural alignment (“knee over toe”) is a key element emphasized for all movements from start to end. One key feature of this program—to make it appropriate to be used as a warm-up program—is that it starts and ends with a running exercise to fully prepare the players for activity with the ball. For the same reason, it works equally well before a game. The 11+ program, with videos of all exercises, is available online14. (Online source 1 - https://fit4football.co.nz/)

The 11+ program lowers injury risk substantially. Female teams using the program can expect a 29% reduction in overall injury rate and an even more substantial effect on severe injuries6. It also works well in male football. When the 11+ program is implemented correctly, male teams also decrease the overall injury rate (46%) and the rate of ACL injuries (58%)15,16. Teams using the program correctly, 2-3 times per week during the pre-season and at least once weekly during the season, have better results than inconsistent users.

The impressive effects of the 11+ program have also led FIFA to develop specific warm-up/prevention programs for kids (FIFA 11+ for kids), referees (FIFA 11+ for referees), and for goalkeepers to prevent shoulder injuries (FIFA 11+S)17-21, recognizing that their injury risks and patterns are different. 

The 2019 FIFA Women’s World Cup hailed “the competition’s best generation of goalkeepers ever” and raised attention on their health. Their role differs from other players, requiring a specific warm-up program meeting their demands. This program, the FIFA 11+ shoulder program, 11+S, provides guidance on a warm-up for adolescent goalkeepers with minimal equipment needed17. (Online source 2 - https://www.youtube.com/playlist?list=PLCGIzmTE4d0gA--gAWtkIcwObk3IfAJPV).

Another well-documented multi-component program is Knäkontroll (Knee Control), a neuromuscular warm-up program based on six exercises targeting knee control and core stability: one-legged knee squat, pelvic lift, two-legged knee squat, the bench, the lunge and jump/landing technique7. Similar to the 11+ program, exercises progress from basic to more difficult (4 levels) and are preceded by low-intensity running. This program has been shown to reduce the risk of ACL injuries by 64% in young adolescent girls. An extended version of the Knee Control program, with the same six main exercises but with more exercise variations to make it more attractive, reduces the risk of lower extremity injuries in general by 26%22,23.

 

Strength training programs

In addition to the multicomponent warm-up programs 11+ and Knäkontroll, specific strength-training programs are designed to target specific injuries, mainly based on eccentric exercises. The hamstrings are one example since muscle strains in the posterior thigh are the most common injury in football. Hamstring injuries also often recur, again and again. The exercise best studied and most commonly used to prevent hamstring strains is the Nordic Hamstring Exercise. This exercise is also included in both the 11+ and Knäkontroll programs. (Online source 3 - https://utbildning.sisuforlag.se/fotboll/tranare/spelarutbildning/knakontroll-engelska/)

The Nordic Hamstring Exercise involves kneeling on a pad (for more knee comfort) and lowering the body forward under control. At the same time, the ankles are held in place by a partner or an immovable object. The hamstring muscles are loaded eccentrically by leaning forward from the knee, not the hip24. A 10-week program of Nordic hamstring exercise training improves eccentric strength by 11% and also changes muscle architecture favorably25. Teams using this exercise reduce their risk of hamstring injuries by as much as 68% and re-injuries by an even more impressive 85%26,27. But note that player compliance is critical; players with low compliance with the NHE exercise are at greater risk compared to those adhering with the prescribed program27.  

Another preventive strengthening exercise-based program targets groin injuries, another problematic football injury. Groin injuries are most often located in the adductors, accounting for about two-thirds of all28 and weak hip adductors increase groin injury risk. The Copenhagen Adduction Exercise increases hip adduction strength29; an 8-week trial with this exercise led to 35.7% gains in eccentric hip adductor strength and a 20.3% increase in eccentric hip abductor strength30. Even more important is that a training program based on this exercise, the Adductor Strengthening Program, reduces the risk of groin problems in football players by 41%9. Like the Nordic hamstring exercise program, the Adductor Strengthening Program calls for training 2-3 times a week during the preseason and one weekly maintenance session in-season. And in the same way as the other programs, teams training consistently have better results than inconsistent users.

Note that the Copenhagen Adduction Exercise has not yet been added to FIFA 11+, so this is something you should consider.

 

Other exercise-based programs

Multi-component programs based on a variety of movement patterns are more efficient than single-component programs in reducing overall injury risk. Such programs and movements can target different neuromuscular qualities such as core and dynamic stability, static and dynamic balance, flexibility, plyometric strength, impact force control during landing after a jump, control of valgus and varus stresses on the knee and ankle, pelvic control. In general, all the programs based on various forms of neuromuscular training are effective for ACL injury prevention32-34.

It is unknown which component is the most important, but balance and core stability training are the most popular. They are among the five most common injury prevention exercises Premier League clubs use and the three most commonly used exercises for clubs in the UEFA Elite Clubs study, which includes the Champions League clubs35,36.

Players with functional ankle instability, which is not uncommon after an ankle sprain, display deficits in postural control and reflex stabilization37. Players with greater sway when they balance on one leg are at greater increased risk for ankle sprains38. Balance training reduces the risk of ankle sprains by about 50%, but this effect is only seen in players with a recent sprain (within the last year). Balance training should therefore always be considered for players with a history of ankle sprains and is the key component of the rehabilitation program after a sprain. Balance exercises should get progressively more difficult, starting on a stable surface, moving to softer surface and finally to a foam mat, wobble board or sand, and gradually also introduce perturbations and distractions. Players should also be exposed to a range of conditions, such as landing from various directions, both with and without perturbations.

Plyometric exercises (exercises using speed and force of different movements to build muscle power) are thought to be highly relevant. They perfectly match the multifaceted nature of the physical demands in football, improving performance through greater maximal strength, sprinting speed, shooting power, endurance, jumping ability and change of direction in players of all ages39-41. Plyometric exercises enhance joint awareness and postural control and in this way can improve lower extremity control and prevent injuries42. This is also why plyometrics reduce the risk of first-time noncontact ACL injuries43.

Traditionally, stretching has been advocated as a way to prevent injuries. Static stretching improves musculotendinous stiffness However, while static and dynamic stretching modalities affect performance and range of motion positively, no studies show any effect on injury risk44.

 

NON-EXERCISE-BASED INJURY PREVENTION MODALITIES

Exercise programs are not the only way to prevent injuries. Other factors can also play an important role. In this section, we will discuss some of them.

 

Sleep

Sleep is associated with the risk of injury. Players who sleep less than 7 hours daily have an increased risk of injury compared to those who sleep longer. If this sleep deprivation is sustained for at least 14 days, the risk of musculoskeletal injury is 1.7 times greater. However, we do not know if sleep loss predisposes the athlete to specific musculoskeletal injuries45. Poor sleep quality also affects performance, increases the risk of injury46 and negatively affects recovery after training. Following a sleep hygiene protocol can be helpful in reducing injury risk.

 

Nutrition, hydration, and supplements

Nutrition is essential for improving the health, performance, and recovery of athletes. A player’s hydration deficit at the beginning of a match can compromise performance47. It is important to maintain a fluid balance before, during, and after exercise, as it will minimize the risk of hyperthermia and exertional heat illness48.

Whether sports supplements have any role in injury prevention is not known and there is always the risk of supplements contamination and doping rule violations for athletes. The complexity of nutrition research and potential conflicts of interest from sponsorship by industry make research in this field particularly vulnerable to bias49. More studies involving humans, specifically athlete populations, are needed to understand if supplements give benefits for the prevention of injury or recovery of injured athletes50.

 

Training load

Athletes participating in elite sports are exposed to high training loads. Poor load management represents a major risk factor for injury. Insufficient respect for the balance between loading and recovery can lead to prolonged fatigue, abnormal training responses (maladaptation), and an increased risk of injury and illness51.

High loads can positively or negatively influence injury risk in athletes. Load must always be prescribed on an individual and flexible basis. Athletes respond significantly better to small increases (and decreases) than more significant loading fluctuations. Regular athlete monitoring is fundamental to ensure appropriate levels of external and internal loads and, thus, to maximize performance and minimize the risk of injury52-54.

 

Taping and bracing

The use of tape and brace to prevent musculoskeletal injuries or re-injuries is common in sports. Taping and bracing are individually linked to an approximately 50% reduction in ankle sprains, but like balance training, this effect is limited to players with a recent sprain (within the last 12 months). We do not know which is best, taping or bracing. Bracing is arguably the cheaper option but taping is better tolerated by football players who want optimal ball control55.

 

Football shoes

Footwear is an integral piece of protective equipment. Players should select footwear based on comfort, traction and stability, while protecting from injury. Shoes should fit well and be wide enough to accommodate the foot. Natural leather uppers will “shape’ around the foot, while synthetic materials will not56,57.

The combination of shoe type, outsole groups (studs) and type of grass affect rotational traction, which is linked to increased lower extremity injury risk. Players should have multiple shoes with varied outsole configurations available. This way – depending on the pitch conditions – they can pick the shoes that provide optimal traction for performance, yet not too high traction at the shoe-ground interface since this increases the risk of injury, especially to the ligaments of the knee such as the ACL58,59. Clinicians should educate players on these aspects, as their choices might be more because of shoe design and marketing than shoe performance.

 

Shin guards

Shin guards effectively prevent minor (contusions) and severe (fractures) injuries to the lower leg60 and are mandatory during football matches since 201561. The main function of shin guards is to protect the soft tissues and bones in the lower extremities from external impact, provide shock absorption and facilitate energy dissipation62. However, they are only effective if they fit the player well and are worn properly. Unfortunately, some players use the smallest size shin guards possible, exposing a large portion of their shins to injuries. As for shoes, clinicians should educate their players on the proper utilization of protective equipment.

 

THE FUTURE OF INJURY PREVENTION IN FOOTBALL

Building an injury prevention program for a team requires careful planning – and that all stakeholders are involved. Ready-made programs like the 11+ and Knäkontroll are first and foremost developed for younger players. At the senior elite and professional level, the structure of the club is more complex. A recent study from the professional league in Qatar documents how injury prevention practices depend on good communication between the medical and technical teams and how the fitness coach has a crucial facilitator role as the link between stakeholders. The study also showed that a single approach to injury prevention like a warm-up program is unlikely to succeed, especially in a multicultural and multi-disciplinary setting63. This is even the case at the elite junior level; indeed, elite academy teams in Europe do not use ready-made-programs like 11+, but adapt them to their setting and barriers (e.g., time and scheduling, player workload) and also employ a mix from a range of different, internally developed programs64.

For the elite level, we suggest that a different approach is needed: A holistic approach to player preparation with complete buy-in from the players and their support staff represents the best solution teams can implement to reduce the risk of injury and illness and promote consistent high-level performance. To this end, we are now developing a novel, systematic approach to risk management in the Qatar Stars League in collaboration between Aspetar Sports Injury & Illness Prevention Program (ASPREV) and the National Sports Medicine Programme (NSMP).

 

 

Roald Bahr M.D., Ph.D

 

Bahar Hassanmirzaei M.D.

 

Montassar Tabben Ph.D

 

Mokhtar Chaabane M.D.

 

Souhail Chebbi M.D.

 

Raouf Nader Rekik M.D.

 

Ramadan Daoud Ph.D.

 

Yorck Olaf Schumacher M.D.

 

Karim Chamari Ph.D.

 

Aspetar Orthopaedic and Sports Medicine Hospital

Doha,  Qatar

 

Contact: roald.bahr@aspetar.com

 

 

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64.           O'Brien J, Finch CF. The implementation of musculoskeletal injury-prevention exercise programmes in team ball sports: a systematic review employing the RE-AIM framework. Sports Med. 2014;44(9):1305-18.

 

 

Header image by Goran Has (Cropped)

 

Figure 1: This diagram shows the typical injury pattern in football. The darker the background color, the bigger the problem. The numbers on the horizontal axis represent injury incidence shown as the number of injuries per 1000 h of exposure, while the vertical axis represents injury severity (the average number of days lost for each injury in the categories shown. Unpublished data from the Qatar Stars League.
Figure 2: The FIFA 11+ Program. The program starts and ends with running exercises – focusing on knee alignment. The middle part has three difficulty levels; players should advance to the next level when they master the first level with good knee control. With acknowledgment to FIFA Medical for the provision of this resource.
Figure 3: FIFA 11+ for kids. The 11+ Kids program takes about 15-20 minutes to complete and consists of seven different exercises: three for unilateral, dynamic stability of the lower limbs (hopping, jumping, and landing); three for the whole body and trunk strength/stability, and one on falling technique. With acknowledgment to FIFA Medical for the provision of this resource.
Figure 4: FIFA 11+S. The FIFA 11+ shoulder program targets shoulder injuries in goalkeepers. The program has three parts: 1. Warm-up exercises, 2. Exercises for improving strength and balance of the shoulder, elbow, wrist and finger muscles, and 3. Core stability and muscle control exercises. The videos are available online. With acknowledgment to FIFA Medical for the provision of this resource.
Figure 5: The Nordic Hamstring Exercise. When the player can control speed all the way down, the load is increased by adding starting speed (push from partner) or holding a weight at the chest.
Figure 6: Adductor Strengthening program. The program includes a single exercise with three levels of difficulty designed based on the Copenhagen Adductor exercise (2 and 3), which requires the support of a partner. The partner holds the knee and the ankle (or just holding knee by both hands), while the athlete supports himself on his elbow in a side plank position. The player then brings his bottom foot up to touch the top foot and then returns towards the ground in a controlled manner. A: Starting/ending position, B: Mid-position31. Reprinted with permission.
Figure 7: Football shoe models with different cleat configurations giving different traction adapted to different pitch conditions. AG: artificial grass. FG: firm ground. SG: soft ground[59].

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Volume 12 | Targeted Topic - Sports Medicine in Padel | 2023
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