Spastic paraplegia 4 (SPG4; often called SPAST-HSP) is characterised by insidiously progressive bilateral reduced-limb gait spasticity. Greater than fifty% of affected persons have some weak spot inside the legs and impaired vibration perception in the ankles.????? ??? ????? ???? ????.????? ???? ??? ??? ??? ???? ?????.Hypokalemic periodic paralysis