Arthrogryposis multiplexa congenita: an epidemiologic study of nearly 9 million births in 24 EUROCAT registers

Objective: To examine the occurrence of arthrogryposis multiplex congenita (AMC) in Europe and to identify possible risk factors. Study design: Retrospective population-based epidemiological study using EUROCAT congenital anomaly registries. The study population included all cases of AMC (based on WHO ICD-9 or ICD-10 codes) that were livebirths (LB), fetal deaths (FD) from 20 weeks gestation and underwent termination of pregnancy for fetal anomaly (TOPFA), 1980-2006. Results: Among 8.9 million births covered by 24 EUROCAT congenital anomaly registries, 757 AMC cases were reported. This gives a prevalence of 8.5 per 100,000. Five hundred and four (67%) AMC cases were LB, 199(26%) cases were TOPFA, and FD occurred in 54(7%) cases. First week survival status was known for 381 of the 504 LB (76%), of whom 87(23%) died within the first week of life. Perinatal mortality associated with AMC was 32%. Two hundred and eighty-two (37%) cases had isolated AMC, 90(12%) had additional syndrome or chromosomal anomalies and 385 (51%) had other major malformations. The same or similar anomaly was reported in 13% of siblings and in 12% of the mother's own family background. Information on prenatal testing was available for 521 cases of which 360 tested positive for a congenital anomaly, representing a sensitivity of 69%. Information on maternal illness before and during pregnancy and medication use in the first trimester was available for approximately a third of the mothers, of whom the vast majority reported no maternal illness or medication use. Conclusion: AMC is a rare occurrence, with a reported prevalence of 1:12,000. In this study, while information on potential risk factors such as maternal disease or maternal use of drugs was limited, they did not appear to be associated with the occurrence of AMC. AMC was lethal in a third of cases, either in utero or during the first week of life, although this may not be solely attributed to AMC as most cases had additional malformations. (C) 2011 Elsevier Ireland Ltd. All rights reserved.