Can you guess why this person has left-sided plantar fasciitis?
This question probably seem somewhat rhetorical. Take a good look at these pedographs which provide us some excellent clues.
First of all, note how much pressure there is over the metatarsal heads. This is usually a clue that people are lacking ankle rocker and pressuring these heads as the leg cantilevers forward. This person definitely have a difficult time getting the first metatarsal head down to the ground.
Notice the overall size of the left foot compared to the right (right one is splayed or longer). This is due to keeping the foot and somewhat of a supinated posture to prevent excessive tension on the plantar fascia.
The increase splay of the right foot indicates more mid foot pronation and if you look carefully there is slightly more printing at the medial longitudinal arch. This is contributing to the clawing of the second third and fourth toes on the right. Stand up, overpronate your right foot and notice how your center of gravity (and me) move medially.The toes will often clench in an attempt to create stability.
The patient’s pain is mostly at the medial and lateral calcaneal facets, and within the substance of the quadratus plantae with weakness of that muscle and the extensor digitorum longus. She has 5° ankle dorsiflexion left and 10 degrees on the right and hip extension which is similar.
The lack of ankle rocker and hip extension or causing her to pronate through her midfoot, Tensioning are plantar fascia at the insertion. The problem is worse on the left and therefore that is where the symptoms are.
Pedographs can be useful tool in the diagnostic process and provide clues as to biomechanical faults in the gait cycle.