Spastic paraplegia four (SPG4; often called SPAST-HSP) is characterised by insidiously progressive bilateral lower-limb gait spasticity. More than 50% of affected individuals have some weak spot within the legs and impaired vibration perception in the ankles.????? ??? ????? ???? ????.????? ???? ??? ??? ??? ???? ?????.??? ?? ??: ???? ??? ??? ? ?? ??