  We report preliminary results of a Wilson Chiral Perturbation Theory (WChPT)
analysis of twisted mass lattice QCD data. The quenched data, previously
published by two different groups, was generated with two definitions for the
critical quark mass and shows a strong non-linear quark mass dependence for
small quark masses for the pion mass definition (``bending phenomenon''). We
find that WChPT describes this characteristic curvature fairly well. Fits to
the data provide estimates for combinations of low-energy parameters, even
though the errors are sizable.
