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Anatomy of Knee Arthritis – Quadriceps

April 15, 2011
Quadriceps_Osteoarthritis

Quadriceps

The quadriceps is a large group of muscles located on the front of the thigh.  They are responsible for extending the leg and they’re strongest muscles in the body.

The quadriceps is divided into four sections.  All four parts attach to the knee cap through the patella tendon.

Rectus Femoris – Located in the middle of the thigh, this section of the quadriceps covers most of the other three sections of muscle (listed below).  Along with knee extension, this muscle also helps flex the hip.  It is attached to the ilium, or the top of the hip.

Vastus Lateralis – Located under the rectus femoris, this section of the quadriceps is attached to the femur and lies on the outside (lateral side) of the thigh.

Vastus Medialis – Located under the rectus femoris, this section of the quadriceps is attached to the femur and lies on the inside (medial side) of the thigh.

Vastus Intermedius – Located under the rectus femoris, this section of the quadriceps is attached to the femur and lies between the vastus medialis and vastus lateralis.

Since all four sections of the quadriceps attach themselves to the knee cap, these muscles play an important role in how the knee slides and glides.  Injury of weakness can lead to or affect osteoarthritis of the knee.



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