Distal tibia interosseous osteochondroma with fibula deformity

Abstract

Osteochondroma, one of the commonest bone tumors, is a cartilage capped exostosis. It occurs
commonly in rapidly growing ends of long bones. It’s rare in slowly growing regions of long bones.
Osteochondroma present in distal tibial interosseous border causing fibular deformity is very
uncommon. Osteochondroma is usually managed conservatively till the age of skeletal maturity,
but distal tibial osteochondromas are managed surgically to prevent deformity, impending fibula
fracture, ankle pain, syndesmotic injury irrespective of skeletal maturity. It is a case report of an
18-year-old male with gradually increasing, painless mass at the distal leg for 6 years, increasing
bowing deformity since 2 years with no functional limitations. Clinical and radiological findings
were consistent with distal tibial osteochondroma with deformity of the adjoining fibula. Exostosis
was excised successfully leaving a thin deformed distal fibula. The result was painless, stable,
and non-progressive residual ankle deformity. Histopathology confirmed the diagnosis with no
malignant transformation.