Functional  Foot Orthosis  (as relates to custom foot orthosis) - An orthotic device that is contoured to the plantar, medial, lateral and posterior aspect of a replication of the foot to control or reduce abnormal motion or abnormal position of the foot and to control the abnormal motion or abnormal position of the lower extremity that is affected by the position and/or motion of the foot.  When applicable, modifications such as wedgings or postings are utilized to control foot motion or position.


 

        A.   Rigid Functional Orthosis - A Functional Foot Orthosis made to maximally prevent abnormal motion or abnormal position of the foot and leg during gait.  This device is made from a rigid material that displays minimal flexibility during use, given that this flexibility is a function of the thickness of the material, the intrinsic rigidity of the material, the size of the orthotic plate, the weight of the patient, and the degree of instability of the foot.
 

          B.  Semi-Rigid Functional Orthosis - A Functional Foot Orthosis used to partially control abnormal motion or abnormal position of the foot and leg during gait.  This device is made from a material that displays moderate flexibility during use, given that this flexibility is a function of the thickness of the material, the intrinsic rigidity of the material, the size of the orthotic plate, the weight of the patient, and the degree of instability of the foot .