- failure of segmentation(unilateral bar), failure of formation(hemivertebrae) or mixed.
- unilateral unsemented bar is common and progressive.
- fully segmented hemivertebra=high risk of progression, nonsegmented of fused hemivertebrae=low risk
- most severe scoliosis in each region of the spine is caused by a a unilateral unsegmented bar with contralateral hemivertebrae at the same level. The next most severe scoliosis is caused by a unilateral segmented bar alone
Congenital Scoliosis Associated Anomalies
Congenital Scoliosis Treatment
- Renal, cardiac, and neurologic evaluation is indicated in infants with congential scoliosis (Basu PS, Spine 2002;27:2255).
- bracing contraindicated because congenital curves are generally rigid.
- semi-segmented hemivertebra generally do not exceed 40 degrees at skeletal maturity and treatment is not usually required except occasionally when the hemivertebra is at the lumbosacral junction
- Surgery:convex growth arrest(anterior hemiepiphysiodesis and posterior hemiarthrodesis), posterior fusion, A/PF +/- I, hemivertebra excision.
Congenital Scoliosis Refereneces
- Mcmaster MJ, David CV: Hemivertebra as the cause of scoliosis: A study of 104 patients. JBJS 1986; 68B: 588-595.
- McMaster MJ, Ohtsuka K: The natural history of congenital scoliosis: A Study of two hundred and fifty-one patients. JBJSA 1982;64:1128-1147.
- Hedequist D, JAAOS 2004;12:266