Pulled hamstring
Encyclopedia
Straining of the hamstring
Hamstring
In human anatomy, the hamstring refers to any one of the three posterior thigh muscles, or to the tendons that make up the borders of the space behind the knee. In modern anatomical contexts, however, they usually refer to the posterior thigh muscles, or the tendons of the semitendinosus, the...

, also known as a pulled hamstring, is defined as an excessive stretch or tear of muscle fibers and related tissues.

Grade 1

Sensation of cramp or tightness and a slight feeling of pain
Pain
Pain is an unpleasant sensation often caused by intense or damaging stimuli such as stubbing a toe, burning a finger, putting iodine on a cut, and bumping the "funny bone."...

 when the muscles are stretched or contracted.

Grade 2

With a grade two hamstring strain there is immediate pain which is more severe than the pain of a grade one injury. It is confirmed by pain on stretch and contraction of the muscle.
It can be also felt with a ping feeling, like elastic in the muscle.

Grade 3

A grade three hamstring strain is a severe injury. There is an immediate burning or stabbing pain and the athlete is unable to walk without pain. The muscle is completely torn and there may be a large lump of muscle tissue above a depression where the tear is.

After a few days with grade two and three injuries a large bruise may appear below the injury site caused by the bleeding within the tissues.

Treatment

Recommended treatment for this injury consists of the RICE
RICE (medicine)
RICE is a treatment method for soft tissue injury which is an acronym for Rest, Ice, Compression and Elevation. When used appropriately, recovery duration is usually shortened and discomfort minimized....

 protocol - rest
Leisure
Leisure, or free time, is time spent away from business, work, and domestic chores. It is also the periods of time before or after necessary activities such as eating, sleeping and, where it is compulsory, education....

, ice
Ice
Ice is water frozen into the solid state. Usually ice is the phase known as ice Ih, which is the most abundant of the varying solid phases on the Earth's surface. It can appear transparent or opaque bluish-white color, depending on the presence of impurities or air inclusions...

, compression, and elevation. The RICE method is primarily used to reduce bleeding and damage within the muscle tissue. Lower grade strains can easily become worse if the hamstring is not rested properly. Grade one hamstrings should be rested from sporting activity for approximately 3 weeks, and grade two injuries typically require 4 to 6 weeks for recovery. Complete ruptures require surgical repair and rehabilitation for approximately 3 months.Yet Grade one injuries if not put pressure upon can heal in a time period of 2 to 3 days.

Initial treatment of the injury, regardless of the severity of the strain, is the same. Within the first five days, the hamstring is rested in an elevated position with an ice pack applied for twenty minutes every two hours. A compression bandage is applied to limit bleeding and swelling in the tissues. After five days of rest, active rehabilitation begins.

Given that rest is such a crucial factor in recovery, crutches may be necessary for long distance travel. For short distances, crutches are unnecessary, however, use of crutches during travel may prevent worsening the grade of the strain.
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