Vastus medialis

Vastus Medialis

The Vastus Medialis is one of the four muscles in the quadriceps group, located in the leg. It is the most medial, or inner, of the quadriceps muscles. The Vastus Medialis originates from the lower part of the femur, and attaches to the patella via the quadriceps tendon.

Anatomy

The Vastus Medialis is located medially in the thigh and extends to the medial border of the patella. It originates from a continuous line of attachment on the femur, which begins on the front and middle side (anteromedially) on the intertrochanteric line of the femur. It also extends down and back (posteriorly) on the medial lip of the linea aspera and to the medial supracondylar line of the femur. The fibers converge onto the medial part of the quadriceps tendon and the medial border of the patella.

Function

The primary function of the Vastus Medialis is to extend the knee. It also plays a role in stabilizing the patella and tracking it during knee flexion and extension.

Clinical significance

Weakness or dysfunction of the Vastus Medialis, and particularly its most distal segment, can potentially lead to patellofemoral pain syndrome (PFPS) or dislocation of the patella. Exercises that target the Vastus Medialis, such as the leg extension, are often prescribed for treating PFPS.

See also

• Vastus intermedius
• Vastus lateralis
• Rectus femoris muscle

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