枕后位约占顶先露的25%，多发生于骨盆有轻度狭窄的情况下。此类骨盆的入口前半部可能稍狭窄，影响枕前位儿头的下降、衔接，而后半部则较宽，故胎枕多转向后方入盆，如宫缩良好，约90%以上将转成枕前位娩出，约5%不能转为前位而成为“持续性枕后位”，最后转成“正枕后位”娩出。
... skull occiput mandibular immobilization 颅骨枕骨下颌骨固定术 occiput posterior presentation 枕后位 persistent occiput posterior 持续性枕后位 ...
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目的探讨持续性枕后位的临床特点及分娩方式。
Objective To investigate the clinical characteristics and modes of delivery in patients with persistent occiput posterior position.
目的观察活跃期施行徒手矫正持续性枕后位的临床效果。
Objective\ To observe clinical effect of manual correcting persistent occipitoposterior position during active stage.
大多数胎头位置异常为持续性枕横位和枕后位，可以试产；
Majority fetus head position unusually is persistent occipitoposterior position and persistent occipitotransverse position, can trying the delivery;
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