  We investigate the effect of a crystal edge dislocation on the metallic
surface of a Topological Insulator. The edge dislocation gives rise to torsion
which the electrons experience as a spin connection. As a result the electrons
propagate along confined two dimensional regions and circular contours. Due to
the edge dislocations the parity symmetry is violated resulting in a current
measured by the in-plane component of the spin on the surface.
  The tunneling density of states for Burger vectors in the $y$ direction is
maximal along the $x$ direction. The evidence of the enhanced tunneling density
of states can be verified with the help of the scanning tunneling technique.
