Topologically conjugate Kleinian groups

Two Kleinian groups $\Gamma_1$ and $\Gamma_2$ are said to be topologically conjugate when there is a homeomorphism $f:S^2 \rightarrow S^2$ such that $f \Gamma_1 f^{-1}= \Gamma_2$. It is conjectured that if two Kleinian groups $\Gamma_1$ and $\Gamma_2$ are topologically conjugate, one is a quasi-conformal deformation of the other. In this paper generalizing Minsky's result, we shall prove that this conjecture is true when $\Gamma_1$ is finitely generated and freely indecomposable, and the injectivity radii of all points of $\mathbf{H}^3/\Gamma_1$ and $\mathbf{H}^3/\Gamma_2$ are bounded below by a positive constant.