先天性肌性斜颈的直接原因是出生后一侧胸锁乳突肌纤维化、挛缩。因为多数病例有臀位产及其他难产史,出生10天以后在患侧颈部出现纤维瘤样硬结,因此,历来的讨论中都提及与产伤有关。以往的学者在早期及晚期的病变肌肉中均未发现出血的痕迹,肌肉切片中也无创伤表现。因此,对是否是正常肌肉被产伤撕裂造成肌组织纤维化,都持否定态度。近年来,我院产科臀位产率已明显减少,本病患儿多为正常分娩或剖腹产。也发现很多患儿在出生时即有颈部歪斜和面颊不对称,日后证实为肌性斜颈者。而年龄在10个月至1岁手术的肌肉标本,其 Congenital muscular torticollis is the direct cause of sternocleidomastoid fibrosis, contracture after birth. Because most cases have breech births and other dystocia, fibroids appear on the ipsilateral neck 10 days after birth, and so trauma has been mentioned in the past discussion. Previous scholars did not find the signs of bleeding in the early and late lesions of the muscles, muscle sections also showed no trauma. Therefore, whether it is normal muscle injury caused by laceration muscle tissue fibrosis, are negative attitude. In recent years, obstetrical breech yield in our hospital has been significantly reduced, most of the patients with normal childbirth or caesarean section. Also found that many children born at the neck askew and cheek asymmetry, later confirmed as muscle torticollis. And the muscular specimens of the age of 10 months to 1 year surgery