Precise patient selection for hip arthroscopy using ultrasound-guided hip injection oleh Takuma Yamasaki, Susumu Hachisuka, Takeshi Shoji, Sotaro Izumi, Hiroaki Murakami, Seiichiro Niimoto, Mikiya Sawa, Kenji Mifuji, Yuji Yasunaga, Nobuo Adachi, Mitsuo Ochi