top of page
< Back

Vastus Medius

Region

Origin & Insertion

['Origin: Intertrochanteric line, linea aspera', 'Insertion: Tibial tuberosity via patellar tendon']

Synergistic Muscles

['Vastus lateralis', 'Rectus femoris']

Joints

['Knee']

Primary Actions

['Knee extension']

Nerve & Spinal Segment

Femoral nerve

Lumbar plexus; L2–L4

Interesting

VMO contributes to patellar stability. [Gray's]

Reversal of Action

Lift trunk toward fixed leg

Common Dysfunctions

Patellar instability, difficulty locking knee

How to Stretch

Heel to buttock with medial pull.

Trigger Points

How to Strengthen

Terminal knee extensions.

Concentric Action

Extend knee

Applications:

Stabilizes patella; commonly activated in knee rehab

Eccentric Action

Control descent in squat or lunge

Isotonic Action

Terminal knee extensions

Related Conditions

['PFPS', 'Quad imbalance']

Isometric Action

Static knee extension hold

Exercise Ideas

['Wall sits', 'Quad sets', 'Step-downs']

Related Blogs

Images

Videos

bottom of page