Grade 2: A grade 2 pulled hamstring is characterized by limping, severe but occasional muscle pain in the posterior thigh area, swelling and inability to straighten the knee. This type of a strain will require around a month to 2 months to heal completely and a lot of care needs to be taken. Treatment needs to be continued for most of the time until recovery.
Grade 3: A grade 3 pulled hamstring is characterized by an inability to walk, severe throbbing pain and a considerable amount of swelling. Surgery and medical treatment may be required for this type of injury and it would take about 6 months to heal completely.
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