Yamazaki H, Uchida K
Am J Obstet Gynecol. 1983 Sep 1;147(1):25-37. doi: 10.1016/0002-9378(83)90079-0.
So many problems have been left unsolved by x-ray pelvimetry for the prognostic diagnosis of cephalopelvic disproportion that the clinical usefulness of x-ray pelvimetry has been questioned and a more scientific approach to evaluation of cephalopelvic disproportion has been sought. By unifying various factors that impose problems in cephalopelvic relationships into one index via new mathematical models, we attempted to estimate quantitatively the potential dystocia caused by inlet disproportion. The index is calculated from ten measurements of data obtainable on roentgenograms, and the practical calculations can be readily done with a programmable calculator. The validity of the assumptions used in the mathematical models and the reliability of the developed index were retrospectively analyzed in 300 primiparous women with cephalic presentations. This study suggests that the mathematical index could serve as a useful prognostic guide to the proper management of labor in association with disproportion.
X线骨盆测量法在头盆不称的预后诊断方面遗留了诸多问题，以至于X线骨盆测量法的临床实用性受到质疑，人们一直在寻求一种更科学的方法来评估头盆不称。通过新的数学模型将头盆关系中存在问题的各种因素统一为一个指标，我们试图定量估计入口平面不称所导致的潜在难产情况。该指标由在X线片上可获得的十项测量数据计算得出，使用可编程计算器即可轻松进行实际计算。我们对300例头先露初产妇进行回顾性分析，以分析数学模型中所用假设的有效性以及所开发指标的可靠性。本研究表明，该数学指标可作为对头盆不称相关分娩进行合理管理的有用预后指南。
