Knee extension

  • Rectus Femoris

    Rectus Femoris Muscle

    The Rectus Femoris muscle is part of the Quadriceps muscle group. It is the only muscle of the group which crosses the hip joint and is a powerful knee extensor when the hip is extended, but is weak when the hip is flexed.

  • Vastus Intermedius

    Vastus Intermedius Muscle

    Vastus Intermedius is one of four quadricep muscles, located deep in the thigh underneath the Rectus Femoris muscle.

  • Vastus Lateralis

    Vastus Lateralis Muscle

    Vastus Lateralis is the most lateral (outer) of the four quadriceps muscles and is felt on the outside top of the thigh.

  • Vastus Medialis

    Vastus Medialis Muscle

    Vastus Medialis is the most medially (inner) located of the quadricep muscles. The portion of the muscle just above the knee is known as VMO (vastus medialis oblique). This is important in stabilising the knee joint and often becomes inhibited following injury.