%0 Journal Article
%A PH Hardcastle
%A R Ross
%A M Hamalainen
%A A Mata
%T Catterall grouping of Perthes' disease. An assessment of observer error and prognosis using the Catterall classification
%D 1980
%J The Journal of Bone & Joint Surgery British Volume
%P 428-431
%V 62-B
%N 4
%R 10.1302/0301-620X.62B4.7430217
%U https://doi.org/10.1302/0301-620X.62B4.7430217
%K