Definition
A strained calf muscle is a partial tear of the small fibers of the calf muscles. The calf muscles are located in the back of your lower leg.
 
Causes
A calf strain can be caused by:

• Stretching the calf muscles beyond the amount of tension or stress that they can withstand
• Suddenly putting stress on the calf muscles when they are not ready for the stress
• Using the calf muscles too much on a certain day
• A blow to the calf muscles

Risk Factors
A risk factor is something that increases your chance of getting a disease, condition, or injury.

• Sports that require bursts of speed, such as:
•     Running
•     Hurdles
•     Long jump
•     Basketball
•     Soccer
•     Football
•     Rugby
• Fatigue
• Tight calf muscles
• Overexertion
• Cold weather

Symptoms
Symptoms include:

• Pain and tenderness in the calf
• Stiffness in the calf muscles
• Weakness of the calf muscles
• Bruising on the calf (if blood vessels are broken)
• Popping sensation as the muscle tears (possibly)

Diagnosis
The doctor will ask about your symptoms and medical history, your recent physical activity, and how the injury occurred. The doctor will also examine your calf for:

• Tenderness and/or bruising directly over the calf muscles
• Pain when contracting the calf muscles, particularly against
• resistance

Muscle strains are graded according to their severity:

• Grade 1
      Stretching with some microtearing of muscle fibers.
      Recovery can be complete in about 2 weeks.
• Grade 2
      Partial tearing of muscle fibers.
      Recovery can take up to 1-2 months.
• Grade 3
       Complete tearing (rupture) of muscle fibers.
       Recovery can take more than 3 months.
       Surgery may be needed to repair the torn muscle fibers.
       This is very rare.

For a severe calf strain, you may have an MRI scan to see if the tearing requires surgical repair. Professional athletes sometimes have MRI scans to help predict the length of their recovery period.

Treatment
Treatment depends on the severity of the strain. Treatment usually includes:

• Rest - Do not do activities that cause pain, such as running, jumping, and weightlifting using the lower leg muscles. If normal walking hurts, shorten your stride. Do not play sports until the pain is gone.
• Cold - Apply ice or a cold pack to the calf area for 15 to 20 minutes, 4 times a day for several days after the injury. Wrap the ice or cold pack in a towel. Do not apply the ice directly to your skin.
• Pain Relief Medications - Take aspirin, ibuprofen (Advil, Motrin), or acetaminophen (Tylenol) to help relieve pain. If you still have tenderness in the calf while taking these drugs, do not return to physical activity. Check with your doctor.
• Compression - Wear an elastic compression bandage (e.g., Ace bandage) around your lower leg to prevent additional swelling. Wrap from the toes up the leg so as to not cause swelling below the wrapping. Be careful not to wrap the bandage too tightly.
• Elevation - Keep your leg higher than your heart as much as possible for the first 24 hours to minimize swelling.
• Heat - Use heat only when you are returning to physical activity. Then use it before stretching or getting ready to play sports.
• Stretching - When the acute pain is gone, start gentle stretching as recommended by a health care professional. Stay within pain limits. Hold each stretch for about 10 seconds and repeat 6 times.
• Strengthening - Begin strengthening exercises for your calf muscles as recommended by a health care professional.

Prevention
To reduce the chance that you will strain a calf muscle:

• Keep your calf muscles strong so they can absorb the energy of sudden physical stress.
• After a short warm-up period, stretch out your calf muscles before physical activity.
• Learn the proper technique for exercise and sporting activities. This will decrease stress on all your muscles, including your calf muscles.

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