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Copyright ©The Author(s) 2022.
World J Orthop. Mar 18, 2022; 13(3): 238-249
Published online Mar 18, 2022. doi: 10.5312/wjo.v13.i3.238
Table 1 Classification systems

Angulation, degrees
Translation
Judet
INondisplaced or horizontal shift
II< 30
III30-60
IVa60-80
IVb> 80
Metaizeau's modification
INon-displaced or horizontal shift< 3 mm
II< 30< 50%
III30-60> 50%
IVa60-80> 100%
IVb> 80
VEpiphyseal separation
O'Brien
Type I< 30
Type II30-60
Type III> 60