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Upper limb deficiencies and associated malformations: a population-based study
1Klinik für Frauenheilkunde und Geburtshilfe, Medizinische Universität zu Lübeck, Vancouver, British Columbia, Canada.
Insights
This study analyzed upper limb deficiencies in over a million births, finding significant variations in associated anomalies. Longitudinal radial defects showed the highest rate of additional malformations, particularly in males.
Area of Science:
- Medical Genetics
- Developmental Biology
- Public Health
Background:
- Limb deficiencies are congenital anomalies with varying etiologies.
- Understanding associated anomalies is crucial for diagnosis and management.
- Previous studies have not comprehensively analyzed patterns of anomalies in upper limb deficiencies.
Purpose of the Study:
- To analyze patterns of associated anomalies in upper limb deficiencies.
- To identify specific malformation clusters within different types of upper limb defects.
- To determine the incidence and characteristics of associated anomalies in a large birth cohort.
Main Methods:
- Retrospective analysis of livebirth data from British Columbia (1952-1984).
- Inclusion criteria: 1,213,913 consecutive livebirths with upper limb deficiencies.
- Categorization into seven subgroups based on limb deficiency type; analysis of associated anomalies and demographic data.
Main Results:
- Significant variation in the proportion of cases with additional anomalies across subgroups (e.g., 89% for longitudinal radial defects vs. 28% for transverse radial defects).
- A male preponderance was observed in cases with associated defects, especially in longitudinal radial defects (2:1 male to female ratio).
- Specific patterns of associated malformations were identified and clustered within subgroups.
Conclusions:
- Upper limb deficiencies are frequently associated with other malformations, with varying incidences depending on the specific defect.
- Longitudinal defects of the radius present a higher risk for associated anomalies, with a notable male predominance.
- The findings highlight the importance of detailed phenotyping and syndromic diagnosis in infants with upper limb deficiencies.
Abstract:
As part of an ongoing analysis of limb deficiencies occurring among 1,213,913 consecutive livebirths in British Columbia during the years 1952-1984, all cases with deficiencies of the upper limbs were analysed with a view to identifying associated patterns of anomalies. This analysis resulted in seven subgroups. For each subgroup, incidence figures for cases with and without additional anomalies were calculated separately. The proportion of cases with additional anomalies varied markedly by subgroup. For example, 89% of cases with longitudinal defects of the radius had additional malformations, while only 28% of cases with transverse defects of the radius had other organ anomalies (chi 2 = 40.55; P < 0.001, one degree of freedom). A preponderance of males was found among the cases with associated defects, particularly in the group with longitudinal defects of the radius (28 males, 14 females; chi 2 = 14.10; P < 0.001). Clustering of specific patterns of associated malformations is described within subgroups.