Spastic paraplegia four (SPG4; also called SPAST-HSP) is characterized by insidiously progressive bilateral lower-limb gait spasticity. Much more than 50% of afflicted folks have some weak spot within the legs and impaired vibration feeling at the ankles.????? ??? ????? ???? ????.????? ???? ??? ??? ??? ???? ?????.??? ?? ??: ???? ??? ??? ? ?? ?? ???