Plantarflexion Movement

As we stand up from a sitting position, movement occurs at the hips, knees, and talus joints. Coxal extension brings the trunk into an upright position. Coxal extensors: gluteus maximus, semimenbranosus, semitendinosus, and biceps femoris shorten as they contract to help bring the trunk to an upright position. Knee extension causes the legs to straighten as we move into a standing position. Plantarflexion occurs at your talus joints as we push down against the ground as you stand. Knee extensors: rectus femoris, vastus medialis, vastus intermedius and vastus lateralis contract and the knee joints straighten up. At the talus, the plantarflexor muscles (gastrocnemius and soleus) push down against the floor. This supports the other muscles as
the body goes to an upright position.