hi friend
some exercises which is routinely used in clinics for VMO
1-assisted short arc exercise with a pillow under the knee
2-with a pillow under the knee,slowly passively extend the knee and ask the patient to try to hold that position,while you slowly remove the support.it caused eccenric actvation and gradually patient will be able to maintain the position
3-in supine lying,external rotation at hip and slowly make patient to do active straight leg raising,initially assist to maintain knee in extension
4-in same side lying ask ,keep the upper leg in front and ask to do adduction against gravity
as you know the VMO fibers originate from the adductor area and its oblique alignment 3 & 4 th exercise helps with adductor activity
you can even try electrical stimulation to VMO with concurrent short arc exercise over a pillow.arthrogenic inhibition of VMO can occur in various conditions.
VMO is considered as the core muscle of knee and its proper functioning is essential for terminal extension activities
cheers