Operative Management: Spring Ligament.

Pes planovalgus is a multiplanar deformity consisting of a combination of hindfoot valgus, collapse of the medial longitudinal arch, forefoot varus, and forefoot abduction. This deformity is often associated with posterior tibial tendon dysfunction. Collapse of the medial longitudinal arch increases stress to the static stabilizers of the medial column including the deltoid ligament, spring ligament, plantar fascia, plantar and talocalcaneal interosseous ligaments, as well as the talonavicular and naviculocuneiform capsules. There is a higher incidence of concomitant spring ligament pathology in pes planovalgus deformity and posterior tibial tendon dysfunction based on magnetic resonance imaging and intraoperative observation than in other static stabilizers.