Abstract
Clinical observation of the results of measures empirically prescribed to curb postpartum retroversion suggested that this empiricism might be without basis in fact. Therefore controlled observations were started. Certain factors appear to favor the production of postpartum retroversion. The tendency toward descensus inherent in the mechanism of labor weakens the supports of the uterus and draws it down, swinging the corpus into a type of retroversion that is identical with early prolapse. Following delivery, the uterus is normally in a position approximating first degree retroversion. Theoretically, this tendency is increased through the dorsal posture of the patient in bed, which is more or less routine. The natural tendency of the heavy corpus to drop back against the sacral promontory is thus accentuated. Subinvolution increases this tendency. The size and weight of the congested uterus (with the patient on her back) work against the normal tendency toward anteversion exerted by shortening

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