Spastic paraplegia 4 (SPG4; also called SPAST-HSP) is characterized by insidiously progressive bilateral reduce-limb gait spasticity. A lot more than fifty% of impacted people today have some weakness from the legs and impaired vibration sense with the ankles.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A chromosomal abnormality consisting in the