TY - JOUR AU - Bernard, AA DO - doi:10.1302/0301-620X.70B5.3192597 UR - https://doi.org/10.1302/0301-620X.70B5.3192597 TI - The flexion sign of needle placement for hip arthrography: brief report T2 - The Journal of Bone & Joint Surgery British Volume VL - 70-B IS - 5 PY - 1988 SP - 844 EP - 844 ER -