The incidence of focal osteonecrosis of the femoral head and its impact on conversion hip arthroplasty after screw fixation of femoral neck fractures: a multicenter retrospective study based on postoperative magnetic resonance imaging

• Hwan-Hee LeeThe Catholic University of Korea Daejeon St. Mary's Hospital
• Young Wook LimThe Catholic University of Korea Seoul St. Mary's Hospital
• Woo-Lam JoThe Catholic University of Korea Seoul St. Mary's Hospital
• Soon-Yong KwonThe Catholic University of Korea Seoul St. Mary's Hospital
• Hee-Man ChiThe Catholic University of Korea Daejeon St. Mary's Hospital
• Seung-Chan KimThe Catholic University of Korea Eunpyeong St. Mary's Hospital