## 3 Results
### Muscle Injuries
#### 3.1.3 Type and Location  
Type and typology of muscle injuries are shown in Table 4. Most of the muscle injuries were diagnosed as a muscle tear (90/207, 43.5%), followed by muscle strain (57/207, 25.5%), with a similar pattern in all age groups. Hamstring injuries were the most affected area for all groups except the U14s, in which injuries to the adductor were the most common (15/32). Injury incidences caused by non-contact muscle injuries (1.61 muscle injuries/1000 h) were higher than contact muscle injuries incidences (0.12 muscle injuries/1000 h, RR = 12.80, 95% CI 7.57-21.65, \(p\) < 0.001), both in training and match play. Re-injuries accounted for 9.2% (19/207) of all muscle injuries sustained during the three seasons. \begin{table} \begin{tabular}{c} **Incidence** \\ **(95\% CI)** \\ \end{tabular}  \\ \hline
**Type** & **Muscle strain** & 18 & \begin{tabular}{c} 0.71 \\ (0.45-1.13) \\ \end{tabular}  & 17 & \begin{tabular}{c} 0.46 \\ (0.28-0.73) \\ \end{tabular}  & 17 & \begin{tabular}{c} 0.56 \\ (0.35-0.90) \\ \end{tabular}  & 5 & \ \begin{tabular}{c} 0.19 \\ (0.86-0.46) \\ \end{tabular}  & 57 & \begin{tabular}{c} 0.48 \\ (0.37-0.62) \\ \end{tabular}  \\
**Muscle confusion** & 6 & \begin{tabular}{c} 0.24 \\ (0.11-0.53) \\ \end{tabular}  & 4 & \begin{tabular}{c} 0.11 \\ (0.04-0.29) \\ \end{tabular}  & 3 & \begin{tabular}{c} 0.10 \\ (0.03-0.31) \\ \end{tabular}  & 8 & \ \begin{tabular}{c} 0.30 \\ (0.15-0.61) \\ \end{tabular}  & 21 & \begin{tabular}{c} 0.18 \\ (0.11-0.27) \\ \end{tabular}  \\
**Tendinopathy** & 12 & \begin{tabular}{c} 0.47 \\ (0.27-0.84) \\ \end{tabular}  & 3 & \begin{tabular}{c} 0.08 \\ (0.03-0.23) \\ \end{tabular}  & 3 & \begin{tabular}{c} 0.10 \\ (0.03-0.31) \\ \end{tabular}  & 1 & \ \begin{tabular}{c} 0.04 \\ (0.01-0.27) \\ \end{tabular}  & 19 & \begin{tabular}{c} 0.16 \\ (0.10-0.25) \\ \end{tabular}  \\
**Muscle tear** & 28 & \begin{tabular}{c} 1.11 \\ (0.76-1.60) \\ \end{tabular}  & 33 & \begin{tabular}{c} 0.88 \\ (0.63-1.25) \\ \end{tabular}  & 18 & \begin{tabular}{c} 0.60 \\ (0.38-0.95) \\ \end{tabular}  & 11 & \ \begin{tabular}{c} 0.42 \\ (0.23-0.76) \\ \end{tabular}  & 90 & \begin{tabular}{c} 0.76 \\ (0.61-0.93) \\ \end{tabular}  \\
**Other** & 5 & \begin{tabular}{c} 0.20 \\ (0.08-0.47) \\ \end{tabular}  & 1 & \begin{tabular}{c} 0.03 \\ (0.00-0.19) \\ \end{tabular}  & 2 & \begin{tabular}{c} 0.07 \\ (0.02-0.26) \\ \end{tabular}  & 3 & \ \begin{tabular}{c} 0.11 \\ (0.04-0.35) \\ \end{tabular}  & 11 & \begin{tabular}{c} 0.09 \\ (0.04-0.15) \\ \end{tabular}  \\
**Not specified** & - & - & 2 & \begin{tabular}{c} 0.05 \\ (0.01-0.21) \\ \end{tabular}  & 3 & \begin{tabular}{c} 0.10 \\ (0.03-0.31) \\ \end{tabular}  & 4 & \ \begin{tabular}{c} 0.15 \\ (0.06-0.41) \\ \end{tabular}  & 9 & \begin{tabular}{c} 0.08 \\ (0.04-0.15) \\ \end{tabular}  \\
**Total** & 69 & \begin{tabular}{c} 2.73 \\ (0.54-1.27) \\ \end{tabular}  & 60 & \begin{tabular}{c} 1.61 \\ (0.43-0.96) \\ \end{tabular}  & 15 & \begin{tabular}{c} 1.52 \\ (1.25-2.07) \\ \end{tabular}  & 32 & \ \begin{tabular}{c} 1.22 \\ (0.30-0.82) \\ \end{tabular}  & 207 & \begin{tabular}{c} 1.74 \\ (1.24-0.33) \\ \end{tabular}  \\ \hline
**Location** & **Hamstring** & 21 & \begin{tabular}{c} 0.83 \\ (0.54-1.27) \\ \end{tabular}  & 24 & \begin{tabular}{c} 0.64 \\ (0.43-0.96) \\ \end{tabular}  & 15 & \begin{tabular}{c} 0.50 \\ (0.30-0.82) \\ \end{tabular}  & 3 & \ \begin{tabular}{c} 0.11 \\ (0.04-0.35) \\ \end{tabular}  & 63 & \begin{tabular}{c} 0.53 \\ (0.41-0.68) \\ \end{tabular}  \\
**Quadriceps** & 9 & \begin{tabular}{c} 0.26 \\ (0.19-0.68) \\ \end{tabular}  & 8 & \begin{tabular}{c} 0.21 \\ (0.11-0.43) \\ \end{tabular}  & 7 & \begin{tabular}{c} 0.23 \\ (0.11-0.49) \\ \end{tabular}  & 6 & \ \begin{tabular}{c} 0.23 \\ (0.10-0.51) \\ \end{tabular}  & 63 & \begin{tabular}{c} 0.11 \\ (0.41-0.68) \\ \end{tabular}  \\
**Adductor** & 16 & \begin{tabular}{c} 0.63 \\ (0.39-1.03) \\ \end{tabular}  & 9 & \begin{tabular}{c} 0.24 \\ (0.13-0.46) \\ \end{tabular}  & 9 & \begin{tabular}{c} 0.30 \\ (0.15-0.57) \\ \end{tabular}  & 15 & \