Jones et al described a classification scheme for congenital aplasia or dysplasia of the tibia in association with an intact fibula. The authors are from the Hospital for Sick Children in London.
Requirements:
(1) congenital defect of tibia
(2) fibula present (although it may be malformed)
Tibia
Other Finding
Type
complete aplasia
lower femoral epiphysis hypoplastic
1a
complete aplasia
lower femoral epiphysis normal
1b
proximal tibia present, distal absent
2
proximal tibia absent, distal present
3
hypoplastic
distal tibiofibular diastasis
4
where:
• Diastasis involves a separation of the two bones, with a defective ankle. While the foot may be normal in structure there is often an equinovarus deformity. The proximal ends may be dislocated as well.
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