Anomalous Wtb couplings modify the angular correlations of the top-quark decay products and change the single top-quark production cross section. We present limits on anomalous top-quark couplings by combining information from W boson helicity measurements in top-quark decays and anomalous coupling searches in the single top-quark final state. We set limits on right-handed vector couplings as well as left-handed and right-handed tensor couplings based on about 1 fb−1 of data collected by the D0 experiment.Received 1 January 2009DOI:https://doi.org/10.1103/PhysRevLett.102.092002©2009 American Physical Society