  At present, many works about magneto-hydrodynamics wave diagnostics in
magnetic flux tubes are based on some pioneer works not considering the
contributions of magnetic twist. Other works considered the effect on
magneto-hydrodynamics waves, but the dispersion relationship they presented
only gave the wave modes of m=0,1,2. The kink mode of m=-1 was absent.
Therefore, in this work we would like to present a complete dispersion
relationship that includes both magnetic twist and the wave mode of m=-1.
Analogous to the m=+1 wave mode, the mode of m=-1 also exhibits the mode change
at finite kr0, from body to surface mode. The phase speeds of this mode are
usually less than those of m=+1 mode. The harmonic curves of m=+1/-1 modes in
dispersion relationship diagrams are approximately symmetric in respect to a
characteristic velocity, e.g. the tube velocity in flux tubes. Based on the
present dispersion relationship, we revisit the issue of spiral wave patterns
in sunspot and find that the magnetic twist has no great influence on their
morphology in the frame of linear perturbation analysis.
