Table 2.

Modified Herring lateral pillar classification

Herring group	Description	Expected outcome	Suggested treatment
A	The lateral pillar is uninvolved, with full height maintained	Uniformly good outcome (100% Stulberg Class I or II)	No treatment
B	Greater than 50% of lateral pillar height maintained	Good outcome (67% Stulberg Class I or II, 27% Stulberg Class III, 6% Stulberg Class IV or V)	Less than 8 years: nonsurgical treatment Greater than 8 years: innominate osteotomy or varus femoral osteotomy
B/C border	Greater than 50% of lateral pillar height, column is narrow (2–3 cm), or approximately 50% of pillar height maintained with poor ossification, or 50% pillar height maintained but depressed relative to central pillar	Intermediate outcome (28% Stulberg Class I or II, 43% Stulberg Class III, 30% Stulberg Class IV or V)
C	Less than 50% of lateral pillar height maintained	Poor prognosis (13% Stulberg Class II, 52% Stulberg Class III, 35% Stulberg Class IV or V)	Nonsurgical treatment