Classifications of Perthes' disease - Heath Taylor 16/1/2001

Caterall - Need AP and frog lateral X-rays ( himself did not use the percentages in the original paper to separate G II & III - he simply says that for group III "only a small part is not sequestrated")

Group I - involve anterior portion of epiphysis only. No collapse or sequestrum

Group II -  £ 50 % involvement with a sequestrum

Group III - ~75% involved, with collapse & sequestrum

Group IV - whole epiphysis involved

Salter Thompson - based on the percentage of the extent of subchondral fracture

Group A - < 50 % ( I & II)

Group B - > 50 % ( III & IV)

Stulberg - performed at time of maturity, to predict risks of OA

Class I - normal hip

Class II - Spherical head on AP & lat XR, but with coxa magna, short neck or steep acetabulum

Class III - Non-spherical but not flat head, with other abnormalities as in Cl II above

Class IV - Flat head with abnormalities of head neck and acetabulum

Class V - flat head with normal neck and acetabulum

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