Blood Clots in Knee

An obstruction of the blood flow in the blood vessels is known as clots. This is usually caused due to the thickening of the blood in either arteries or veins. This can lead to severe health complications like strokes, heart attacks and can be life threatening at times. Blood clot is knees can cause swelling and the organs may not function properly. There are many chances for the blood clots formed above the knees to break and travel to the heart or lungs than the ones formed below.


Blood clots in the knees are usually caused due to the following reasons.

  • Paralysis
  • Obesity
  • Major surgeries
  • Varicose veins
  • Immobility
  • Cancer and
  • Heart diseases

In some cases, it can be cause in women due to the intake of birth control pills and they are at a high risk of developing the condition of deep vein thrombosis.


A person suffering from this condition may experience the following symptoms

  • Swelling:

    Blood clots can block the blood flow in the veins forming a pool of blood. Swelling is the very first symptom of this condition and the leg below the knee may swell. It may occur suddenly and the person may experience swelling only in one leg.

  • Pain:

    This condition may cause severe pain above and below the knees and a person may experience pain while walking and standing. Blood clots in the knee may cause tenderness in the knee and leg as well.

  • Warmth:

    A person may feel warmth when he/she touches the leg. This is usually felt in the swollen area and this can sometimes lead to mild fever.

  • Redness:

    The area above or below the knee may turn red in color due to lack blood flow in that particular area.


  • Anticoagulants like warfarin and heparin help in thinning the blood and they also help in lowering the condition of blood clots present in the knees.
  • Heparin with low molecular weight may be used to avoid the formation of clots.
  • Warfarin may take around 3 to 12 months to treat this condition.
  • The clots may be dissolved with the help of Thrombolysis.
  • If the clots still persist then a surgery may be required to treat this condition. A Vena cavafilter is implanted in the knee in order to prevent the clot from traveling to the lungs.

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