Classification for Sirenomelia

Stocker and Heifetz developed a classification scheme to describe the pattern of lower limb bone abnormalities seen in patients with sirenomelia.

Type	Femur	Tibia	Fibula	Description
I	2	2	2	all bones present
II	2	2	1	single fibula (fused)
III	2	2	0	fibulae absent
IV	partially fused	NA	fused	femurs partially fused; fibulae fused
V	partially fused	NA	not fused	partially fused femurs
VI	1	1	NA	single femur, single tibia
VII	1	0	NA	single femur, tibia absent

where:

• At least 1 femur always seems to be present.

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Purpose: To classify a patient with sirenomelia using the limb classification scheme of Stocker and Heifetz.