STRAIN is an injury to a muscle or tendon in which the muscle fibres tear as a result of overstretching. A strain is also known as a pulled muscle.
There are 3 grades of strain –

• Grade 1 strains usually cause stretching of a few of the muscle fibers.
•  Grade 2 injury is more significant damage.
•  Grade 3 injury is a complete rupture of the muscle.

SPRAIN  is a tear in the ligament. The severity varies from grade I,II, III.

The grading system for sprain injury are –

• Grade 1 sprains stretch fibers of the ligament.
• Grade 2 sprains are injuries where part of the ligament is torn.
• Grade 3 sprains are when the ligament is completely torn or ruptured.