@article{doi:10.1302/0301-620X.70B5.3192597,
author = {Bernard, AA},
title = {The flexion sign of needle placement for hip arthrography: brief report},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {70-B},
number = {5},
pages = {844-844},
year = {1988},
doi = {10.1302/0301-620X.70B5.3192597},
url = {https://doi.org/10.1302/0301-620X.70B5.3192597}
}