There are factors that increase the risk of having a breakdown^3-7  :

• A non-existent or inadequate warm-up
• Unusual or excessive strain
• A state of fatigue
• Lack of flexibility (decrease in range of motion)
• History of muscle tears (2,7 times more risk)
• Underlying joint damage (2 to 3 times more risk)

20% of injuries occur during matches against 31% during sports training.