Vastus Medialis Oblique

Original Editor - Rafet Irmak

Top Contributors - Rafet Irmak, George Prudden, Richard Benes, Kim Jackson and Evan Thomas  

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Prime mover for screw home movement with Vastus Lateralis.


Medial side of femur


Quadirceps tendon


Increase mechanical advantage of knee joint to perform knee extention by other heads of quadriceps.


Increase mechanical advantage of knee joint to perform knee extention by other heads of quadriceps.

Other Important Information

Is it a real muscle or a gost?

For physiotherapist vastus medialis oblique (VMO) is a well known muscle. But some anatomist do not accept VMO as real muscle. The first paper I have seen was a letter to editor [ref needed]. In this letter it is clearly stated that VMO is not an independent muscle. It is a part of vastus medilis.

Recent years the topic is still unclear. You can find a list of articles below;

  • Smith TO, Nichols R, Harle D, Donell ST. Do the vastus medialis obliquus and vastus medialis longus really exist? A systematic review. Clin Anat. 2009 Mar;22(2):183-99.
  • Pattyn E, Verdonk P, Steyaert A, Vanden Bossche L, Van den Broecke W, Thijs Y, Witvrouw E. Vastus medialis obliquus atrophy: does it exist in patellofemoral pain syndrome? Am J Sports Med. 2011 Jul;39(7):1450-5. Epub 2011 Apr 12.
  • Günal I, Araç S, Sahinoğlu K, Birvar K. The innervation of vastus medialis obliquus. J Bone Joint Surg Br. 1992 Jul;74(4):624.
  • Holt G, Nunn T, Allen RA, Forrester AW, Gregori A. Variation of the vastus medialis obliquus insertion and its relevance to minimally invasive total knee arthroplasty. J Arthroplasty. 2008 Jun;23(4):600-4. Epub 2008 Mar 4.
  • Lin YF, Lin JJ, Cheng CK, Lin DH, Jan MH. Association between sonographic morphology of vastus medialis obliquus and patellar alignment in patients with patellofemoral pain syndrome. J Orthop Sports Phys Ther. 2008 Apr;38(4):196-202. Epub 2007 Nov 21