凡胎头娩出后,胎儿前肩被嵌顿在耻骨联合上方,用常规助产方法不能娩出胎儿双肩,称肩难产。其发病率国外报道0.15%~0.6%,国内报道0.15%;肩难产的发生率:胎儿体质量≥4000g为3%~12%,≥4500g发生率为8.4%~22.6%。肩难产虽不多见,但常引起母婴并发症,而且多猝然发生,使助产者措手不 Where the fetal head was delivered, the fetus was implanted in the anterior shoulder pubic symphysis in the top, with conventional midwifery methods can not be delivered fetal shoulders, shoulder hard labor. The incidence of foreign coverage of 0.15% to 0.6%, 0.15% reported in the country; shoulder the incidence of dystocia: fetal body mass ≥ 4000g 3% to 12%, ≥ 4500g incidence of 8.4% to 22.6%. Shoulder dystocia, although rare, but often lead to maternal and child complications, but also more sudden, so that the helper is a surprise