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Theoretical calculations for the proton-induced K-shell ionization probability in which the ground-state electron wave function is allowed to be polarized under the influence of the incident projectile are described. These calculations extend the results of a previous theoretical model in which the wave function is allowed only a spherically symmetric distortion. The model is based upon lowest-order perturbed-stationary-state theory. Comparisons between calculations performed with different wave functions as well as between calculations performed with the polarized wave function and experimental data are shown for 0.3 to 2.4 MeV protons in titanium.