Spastic Paraplegia 18b, Autosomal Recessive, also known as spastic paraplegia 18, autosomal recessive, is related to hereditary spastic paraplegia 18 and recessive intellectual disability-motor dysfunction-multiple joint contractures syndrome. An important gene associated with Spastic Paraplegia 18b, Autosomal Recessive is ERLIN2 (ER Lipid Raft Associated 2). Affiliated tissues include brain and skeletal muscle, and related phenotypes are intellectual disability and hyperreflexia