When running, there source of propulsion should come from your hips and trunk. If your source of propulsion is from the ankle or knee then this makes you susceptible to pain in those joints. Injuries such as “runners knee”, patella tendinopathy or “IT band syndrome” can be caused by this.
This compensation could be due to tight hip flexors, poor mobility in the spine, and/or a dysfunction in the movement of the rib cage as well as issues with the muscles in the lower limb.
The muscles of the lower limb must co-contract efficiently in order to transfer forces from the trunk to the floor in order to propel yourself and run efficiently and pain free.