Spastic paraplegia 4 (SPG4; often called SPAST-HSP) is characterized by insidiously progressive bilateral reduce-limb gait spasticity. More than 50% of afflicted folks have some weak spot within the legs and impaired vibration feeling at the ankles.?? ????? ???? ??? ???? ?? ??? ? ?? ???? ??? ? ????. ?? ????? ??? ????? ??? ???? ?? ???? ??????!??? ??