In this study we used a Finite Element model of the middle ear to evaluate LDV (Laser-Doppler-Vibrometer) measurements of sound induced umbo vibrations. Simulations were performed for the intact ossicular chain, otosclerosis, incus luxation and malleus head fixation. Simulation results are comparable to results from clinical investigations. Incus luxation and malleus head fixation can be clearly distinguished. Results for otosclerosis range from almost unchanged to moderate changes in umbo vibrations, depending on particular middle ear morphology.