RT Book, Section A1 Phillips, William A. A1 Haruno, Lee S. A1 Sucato, Daniel J. A2 Kline, Mark W. SR Print(0) ID 1182933099 T1 Disorders of the Neck and Spine T2 Rudolph's Pediatrics, 23e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259588594 LK accesspediatrics.mhmedical.com/content.aspx?aid=1182933099 RD 2024/04/24 AB Torticollis (wryneck) is a head position whereby the ear is tilted to 1 shoulder and the chin is rotated to the opposite shoulder. The most common form of torticollis is known as congenital muscular torticollis and is due to overpull of the sternocleidomastoid (SCM) muscle. This deformity is typically noted within the first 2 to 4 weeks of life and almost always by 6 months of age. The incidence of congenital muscular torticollis is reported to be approximately 3 to 5 per 1000 births. Although its etiology is not completely understood, the condition has been previously linked to breech presentation, increased infant size, difficult forceps delivery, and first-born children. Orthopedic disorders associated with torticollis include hip dysplasia, clubfoot, and metatarsus adductus.