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FFU complex: an analysis of 491 cases

W Lenz¹, M Zygulska, J Horst

¹Institut für Humangenetik, Universität, Münster, Germany.

|May 1, 1993

Summary

The femur-fibula-ulna (FFU) complex, a rare limb malformation, can affect one or more limbs. This study suggests FFU complex encompasses cases with even single limb defects, distinct from other limb malformations.

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Area of Science:

Medical Genetics
Developmental Biology
Orthopedics

Background:

The femur-fibula-ulna (FFU) complex is a rare congenital condition characterized by associated defects of the femur, fibula, and/or ulna.
These cases are typically sporadic, with specific upper limb anomalies like amelia and peromelia being notably frequent.

Purpose of the Study:

To investigate the spectrum and classification of limb malformations within the FFU complex.
To evaluate the hypothesis that FFU complex may include cases with isolated limb defects.

Main Methods:

A retrospective study of 491 patients diagnosed with FFU complex.
Analysis of the frequency and distribution of limb malformations across affected limbs.

Main Results:

Nearly equal proportions of malformations were observed across groups with one, two, three, or four limbs affected, supporting the inclusion of single-limb cases.
Malformations showed significant asymmetry, with a higher prevalence in unilateral presentations, upper limbs, the right side, and males.
FFU complex malformations demonstrated minimal overlap with other known limb defect categories.

Conclusions:

The findings support broadening the classification of FFU complex to include cases with isolated limb malformations.
The distinct nature of FFU malformations suggests a unique etiology, possibly involving early somatic mutations.

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