A family study on isolated congenital radial and tibial deficiencies in Hungary, 1975-1984.

Radial and tibial deficiencies are frequently (70%) associated with non-limb abnormalities. Isolated radial and tibial deficiencies may have a different etiology: in this study radial deficiencies were more frequent, there were milder subtypes and one-limb involvement was found in 70% of cases, tibial deficiencies were rare, mild subtypes did not occur and in general more limbs were involved. Among multimelic cases, one case had hypoplasia of the tibia with polydactyly and two cases had tibial aplasia with split hand +/- foot of autosomal dominant inheritance. Of 40 cases, four were familial. Findings of a case-control study on this population-based and validated 10-year cohort showed a lower mean birth weight and a higher rate of low birth weight in cases with isolated radial and tibial deficiency.