The peroneus longus and peroneus brevis can cause and contribute to pain on the outside of the ankle, the outside of the foot, and pain on the lower leg just below the knee. It contributes to weak ankles and foot drop.
The tibialis posterior muscle can cause and contribute to pain in the lower leg just above the heel. This pain will often extend into the heel and the bottom of the foot. Pain will sometimes extend up into the lower calf. If you have fallen arches, you should check the tibialis posterior for trigger points and tightness because dysfunction of this muscle will allow your ankles to collapse inward.
The peroneus tertius muscle can cause and contribute to pain in the lower leg bend where the leg, ankle and foot connect. Pain is often felt on the outside of the heel. If your ankles are weak and have a tendency to buckle, you should check this muscle for trigger points and tightness. A classic sign of peroneus tertius dysfunction is pain worsens with each step.