Rigid Flat Foot
Unlike a flexible flat foot deformity the rigid flat foot does not develop an arch the tip toe test. The main causes of rigid flat foot are:
End stage arthriitis
These are much more serious conditions which Mr Metcalfe will check for as part of your examination and assessment. The top picture is an example of "vertical talus". This is condition where the ankle bone points too far downwards. This is normally identified in infancy. Tarsal coalition is where the bones fail to divide properly (lower picture red arrow). This is typically seen in adolescence as the bones develop.