This highlights the importance of reducing joint swelling for acute injuries. A good example of this is poor patella tracking. This weakness can then lead to further secondary issues such as biomechanical imbalances due to tight or weak structures. This fluid inside the knee contributes to the inhibition of nerve signalling and inhibits the VMO muscle, which consequently results in weakness of the VMO. Unfortunately, this smooth upwards pull of the patella can be interrupted by a varying maladaptation’s in the system.Ĭlinical Significance: When there is acute inflammation there is often swelling and fluid within the joint capsule of the knee. If the quadriceps are functioning correctly they should contract simultaneously and the patella should track smoothly and upwardly through the femoral groove. When the quadriceps contract and pull on their insertion points at the patella (knee cap), this causes and upward tracking of the knee cap in the femoral groove. The VMO originates from a continuous line of attachment along the thigh bone and inserts into the quadriceps tendon on the inside border of the knee cap.įunction: Not only does VMO extend the knee, but it also has a very important function in correct knee-cap tracking. Actions: Knee extension (straightening the knee).Insertion: Quadriceps tendon near the knee.Origin of the VMO: Medial side of the femur (thigh bone).The other three muscles that make up our quadriceps are the vastus lateralis, vastus intermedius and rectus femoris. Structure: The VMO is a muscle located in the anterior (front) compartment of the thigh. Its primary function is to extend the knee. Your VMO sits medially or on the inside of your thigh. Vastus Medialis Oblique (VMO) is one of four quadriceps muscles.
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