Abnormal foot morphology Increased plantar fascia thickness 2025-12-18T15:49:31Z Plantar fasciitis The plantar fascia, also called the plantar aponeurosis, is a strong connective tissue structure that helps maintain the longitudinal arch of the foot. The diagnosis of plantar fasciitis generally relies on clinical history and physical examination. The main symptoms include pain and stiffness in the morning, or pain at the beginning of activity after rest. Physical examination reveals tenderness at the origin of the PF and impaired dorsiflexion of the ankle and extension of the toes. MRI or ultrasound of the foot show thickening of the plantar fascia (over 4.5mm) or increased signal within the plantar fascia. Increased thickness of the plantar fascia. This finding can be ascertained by ultrasound or magnetic resonance imaging.