Fiess line

Fiess line:
• used to assess static posture of medial longitudinal arch
• this consists of a line drawn from the inferior aspect of the medial malleolus to the centre of the first metatarsal head
• a vertical line is then drawn from the navicular to the ground and then divided into equal thirds
• if foot is supinated or cavus  the first line will pass through the upper third of the vertical line
• if the foot is pronated or flat  the first line will pass through the middle third of the vertical line

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