@article{doi:10.1302/0301-620X.53B1.30,
author = {Macdonald, Donald},
title = {PRIMARY PROTRUSIO ACETABULI },
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {53-B},
number = {1},
pages = {30-36},
year = {1971},
doi = {10.1302/0301-620X.53B1.30},
url = {https://doi.org/10.1302/0301-620X.53B1.30}
}