Table 2: Histological findings.

Histopathological findings (H&E/Safranin-O staining)
Patient nr.	Involved Side	Medial specimens	Lateral specimens
1	L	Endochondral ossification, intra-cortical chondrocyte-rich areas, numerous irregular growth arrest line lines	Normal aspect
2	R	Endochondral ossification, intra-cortical chondrocyte-rich areas	Normal aspect, poor quality of specimen
3	L	Endochondral ossification, diffuse presence of intra-cortical chondrocytes, numerous irregular growth arrest line lines	Normal aspect, poor quality of specimen
3	R	Endochondral ossification (fibrodysplastic aspect), diffuse presence of intra-cortical chondrocytes, numerous irregular growth arrest line lines	Normal aspect
4	L	Endochondral ossification, intra-cortical chondrocyte-rich areas	Normal aspect
4	R	Endochondral ossification, prominent presence of subperiostally located areas of bone marrow	Normal aspect

Abbreviations: R: right; L: left.

The histological findings are described separately for each specimen after Mayer’s Hematoxylin (Dako) and additional staining with Safranin-O.