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The Mishna (72b) offered two cases where a husband stipulates a condition before marriage. In one, he makes the marriage conditional on the fact that his wife has not taken vows upon herself; in the other his condition is that she does not have any blemishes.
The baraita brought by the Gemara on our daf discusses a woman who accepted these conditions and following the kiddushin goes to the Sage to have her vows rescinded or to a doctor to have her blemish healed. In such cases, the condition will be considered to have been fulfilled when the vows were removed by the Sage, but not when the blemish was healed by the doctor.
the Gemara explains that the Sage voids the vow retroactively, and we discover that at the moment of marriage the wife really was unburdened by vows. In the case of the doctor, however, the blemish was only healed from the time that the medical procedure was performed, so at the moment that the kiddushin was to take effect, the condition was not fulfilled.
we explore the status of physicians and healing and they relative weight in deciding halachic conflicts.