Incidence and Prognostic Factors for Lower Extremities Injuries in Polish Youth Soccer Academy.

Study Overview
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Brief Summary
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The aim of our study is to obtain data on the occurrence of injuries, their mechanisms and types among children and adolescents from a youth soccer club. In addition, in order to determine the potential risk of injury, the investigators will examine the prognostic factors on the basis of tests assessing the antropometric, anatomical, physical and fitness characteristics.

Detailed Description
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During the 2020/2023 seasons, participants will be obliged to report injuries to to sports physiotherapists. Supervision and data collection on injuries will be documented by experienced sports physiotherapists. Using the Injury Record Form, a standardized definition and classification of injuries in line with the International Olympic Committee Consensus describing methods for recording and reporting epidemiological data on injuries and diseases in sport (Bahr et al. 2020). In addition, the data will also come from a physiotherapeutic examination, and in the case of severe injuries (requiring specialist consultation), a medical examination (orthopedic and / or neurological) and imaging tests. Training and match exhibition (time spent by participants during training units and match games) will be recorded individually for each participant by the coaches of a given team (year). The given data (in minutes) will allow to determine the total time of sports exposure. The participant's missed training and / or competition due to an injury will also be analyzed.

Official Title
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Incidence and Prognostic Factors for Lower Extremities Injuries in Polish Youth Soccer Academy.

Conditions
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Musculoskeletal Diseases, Athletic Injuries

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy, not reporting health problems on the day of the examination active participation in football competitions in the football club having a medical permit to participate in football games signed consent of the parent / guardian to participate in the study Exclusion Criteria: unable to participate in the study restrictions related to full participation in football games and / or training

Ages Eligible for Study
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Minimum Age: 10 Years
Maximum Age: 16 Years

Sexes Eligible for Study
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Male

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Youth football players<br>Young footballers aged 10-16 training and playing for a Polish football club. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The incidence of sports-related injuries in youth athletics | Injury incidence rates were calculated per 1000 player hours (matches and training) According to a consensus statement on injury definitions and data collection procedures in soccer studies; | Injury incidence rates were calculated per 1000 hours of play over the 12-month prospective follow-up | 
| The incidence of recurrent sports-related injuries | According to a consensus statement on injury definitions and data collection procedures in soccer studies; | Recurrent injuries incidence rates were calculated per 1000 hours of play over the 12-month prospective follow-up | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Injury severity | Time loss in days (days unable to train) | Injury severity were calculated per days of rehabilitation over the 12-month prospective follow-up | 
| Injuries according to location | Location of the injury on the body | Description of the number of injuries according to location of the injury on the body over the 12-month prospective follow-up | 
| Injuries according to type of the injury | Type of the injured structure | Description of injuries according to the type of the injury over the 12-month prospective follow-up | 
| Muscle flexibility and range of joint motion | Muscle flexibility, range of joint mobility (degrees as measured by a goniometer) | over the 12-month prospective follow-up | 
| Peak Height Velocity | Peak Height Velocity (PHV) calculated using the 'maturity offset' value (report as PHV years) | over the 12-month prospective follow-up | 
| Y-Balance Test | Dynamic Balance of the lower extremities (record as reach distance in centimeters cm and normalized reach distance in percentages %) | over the 12-month prospective follow-up | 
| Counter Movement Jump, Broad Jump and Single Leg Hop for Distance | Power of the lower limbs measured as distance in single-leg and double-leg jump tasks (record as distance in centimeters cm) | over the 12-month prospective follow-up | 
| Functional Movement Screen (FMS) | The Functional Movement Screen (FMS) is a screening tool used to identify limitations or asymmetries in movement patterns. FMS consists of 7 movement tasks (deep squat, lunges, hurdle steps, a push-up, straight-leg raises, shoulder mobility, and rotary stability). Each task will be visually assessed by an experienced physiotherapist and marked on a 4-point scale (0-3, worst-best). The total maximum score that can be obtained is 21 points. | over the 12-month prospective follow-up | 
| Kinematic analysis of the single-leg movement tasks | Kinematic analysis of the single-leg movement tasks (single-leg squat, single-leg landing) - 2D video analysis - record as degrees of motion of the joints | over the 12-month prospective follow-up |