If the tension in the calf muscle becomes excessive due to repetitive actions or overstretching, the calf muscles can tear. This tends to occur when the individual moves suddenly from a stationary position to that of extreme movement, such as playing tennis. Calf strain can also be caused by general wear and tear after engaging in activities such as distance running, if the correct stretches are not performed before and after each activity.
Experts use the following grading system when assessing a calf strain:
Grade 1 – a small number of muscle fibres become torn, but the patient can still function normally.
Grade 2 – a significant number of fibres are torn and quality of movement is affected. This is the most common strain seen in quadriceps.
Grade 3 – the muscle is ruptured, resulting in loss of function.