A proposed biomechanical explanation is that restricted ankle joint dorsiflexion directly results in overpronation of the foot, which causes internal rotation of the lower extremity, which strains the external/abductor musculature, which can then no longer prevent femoral adduction; hence genu valgus.
Case Study: Kerrati came in for wellness massage, but during the postural examination, the therapist noticed that her right arch drops markedly.
Evertor muscles of the foot should be strengthened in a client who has the postural dysfunction pattern of overpronation (dropped arch).
The role of manual therapy for a rigid flat foot (overpronation) is to loosen fascial adhesions that are locking the bones in a position of pronation.
The first and most obvious sign of overpronation is a flat foot / dropped arch. A supple flat foot loses the arch only when weight bearing.
A supple flat foot is caused by either lax ligaments and/or weak musculature that cannot support the arch when weight-bearing.