File:Flexion Extension Leg.png - Wikimedia Commons

Cutaneous spinal nerves of the lower limb (Gray's illustrations), Radiology Case

Neuromuscular activation of the quadriceps femoris, including the vastus intermedius, during isokinetic knee extensions

The Metacarpophalangeal Joint - Ligaments - TeachMeAnatomy

Knee Joint - WikiMSK

A proper sequence of dynamic alignment in transtibial prosthesis: insight through socket reaction moments

Excessive flexed position of the femoral component causes abnormal kinematics and joint contact/ ligament forces in total knee arthroplasty

File:FlexsionExtension2017.jpeg - Wikipedia

Flexion and extension hi-res stock photography and images - Alamy

File:Flexion illustration 01.png - Wikimedia Commons

Leg angular motion during the gait cycle. (a) Simplified illustration

Rectus Femoris