There are substantial blood vessels passing in the location powering the knee (generally known as the popliteal Place). The massive muscles with the thigh go the knee. If you are a Mayo Clinic client, We'll only make use of your secured wellness info as outlined inside our Observe of Privacy https://www.theorthopaedicandpainpractice.com/what-is-an-anterior-cruciate-ligament-acl-injury/