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Anatomy of Knee Arthritis – Hamstrings

April 13, 2011
Hamstrings

Hamstrings

Hamstrings refer to the muscles located on the back of your thigh.  These four muscles are responsible for flexing the knee, and three of the four help extend the hip.  The hamstrings are comprised of the:

Semitendinosus: is located on the back of the thigh, on the inside of the body (medial aspect).  This muscles helps straighten the hip and bend the knee.  It also assists rotating the knee inward (medially).

Semimembranosus – is located on the back of the thigh, on the very inside of the leg.  This muscle helps straighten the hip and bend the knee.

Biceps Femoris – is located on the back of the thigh, and has two parts:

  1. Long Head – attaches from the hip to the fibula and tibia.  It is responsible for extending the hip and bending the knee.  It also helps rotate the leg.
  2. Short Head – attaches from the femur to the fibula and tibia.  It is responsible for bending the knee and rotating the leg.

Keeping the hamstrings flexible is important if you have osteoarthritis.  Tight hamstrings will affect how your knee bends and straightens.



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