Osteochondroma staging

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Maria Fernanda Villarreal, M.D. [2]

Overview

According to the Musculoskeletal Tumor Society (MSTS) classification, there are 3 stages of osteochondroma based on the tumor activity. Each stage is assigned a number that designate the level of bone erosion. The different stages of osteochondroma, include: stage I, stage II, and stage III.

Staging

• The table below summarizes the staging classification according to the Musculoskeletal Tumor Society (MSTS) for osteochondroma.

Osteochondroma Staging Classification Based on the Tumoral Activity
Adapted from Clin Orthop Relat Res. 2010 Jul; 468(7): 2000–2002.

Stage	Description
Stage I	Inactive or static lesions
Stage II	Actively growing lesions Most osteochondromas occur in this stage.
Stage III	Actively growing lesions that are locally destructive/aggressive Deformity secondary to mass effect Malignant degeneration Low-grade chondrosarcoma