Comparison of femoral neck system fixation outcomes in nondisplaced femoral neck fractures: a multicenter retrospective study of patients aged below and above 75 years

• Hwan-Hee LeeThe Catholic University of Korea Daejeon St. Mary's Hospital
• You Seung ChunThe Catholic University of Korea Uijeongbu St. Mary's Hospital
• Weon-Yoo Kim
• Young Wook LimThe Catholic University of Korea Seoul St. Mary's Hospital
• Seung Chan KimThe Catholic University of Korea Eunpyeong St. Mary's Hospital