Spastic paraplegia four (SPG4; generally known as SPAST-HSP) is characterized by insidiously progressive bilateral lessen-limb gait spasticity. Greater than 50% of affected persons have some weak spot during the legs and impaired vibration perception within the ankles.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.Hypokalemic periodic paralysis (hy