the spinal surgery
you had is probably responsible because the parasympathetic control centre for erection is at L5 .if this is damaged by itself, you will not get erection when you are stimulated but sometimes reflex erection is retained. for this, you may need intra cavernosal injections of prostaglandin
and see if it works. this needs to be associated with sexual stimuli by eyes, ears or touch. if this does not work, then penile prosthesis
is the only remedy left
people after spinal surgeries can live a sexy life, more often than not.
good luck for a happy life
Dr Saatiish Jhuntrraa