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Postural control of upright stance was investigated in well-compensated, unilateral vestibu-lar loss (UVL) subjects compared to age-matched control subjects. The goal was to deter-mine how sensory weighting for postural control in UVL subjects differed from control subjects, and how sensory weighting related to UVL subjects ’ functional compensation, as assessed by standardized balance and dizziness questionnaires. Postural control mecha-nisms were identified using a model-based interpretation of medial–lateral center-of-mass body-sway evoked by support-surface rotational stimuli during eyes-closed stance. The surface-tilt stimuli consisted of continuous pseudorandom rotations presented at four dif-ferent amplitudes. Parameters of a feedback control model were obtained that accounted for each subject’s sway response to the surface-tilt stimuli. Sensoryweighting factors quan-tified the relative contributions to stance control of vestibular sensory information, signaling body-sway relative to earth-vertical, and proprioceptive information, signaling body-sway relative to the surface. Results showed that UVL subjects made significantly greater use of proprioceptive, and therefore less use of vestibular, orientation information on all tests. There was relatively little overlap in the distributions of sensory weights measured in UV