We present 2 sibs with autosomal recessive spastic paraparesis and sev
ere amyotrophy of the distal limb muscles. Elaborate neurophysiologic
studies disclosed slight to moderate slowing of motor conduction, mode
rate to severe reduction of motor action potentials, denervation poten
tials, and increased distal motor latencies. This syndrome, not having
been reported since the papers by Ormerod (5) in 1904 and Holmes (6)
in 1905, constitutes another rare, benigN, complicated form of heredit
ary spastic paraparesis.