Proximal femoral fractures are common in older adults. Zimmer natural nail (ZNN, Cephalomedulary Asia; Zimmer, Warsaw, IN, USA) known as useful in immobilizing the fractures of the proximal femoral fractures, have a critical complications like femoral head perforation and cut through in pelvic bone. We report a case that the femoral head perforation by the hip screw occured within 2 months of the operation, and 8 months after operation, the hip screw is completely separated from the metal body and cut through the pelvis.

• 김보선(조선대학교 의과대학 정형외과학교실) | Boseon Kim (Department of Orthopaedic Surgery, College of Medicine, Chosun University, Gwangju, Korea)
• 이상홍(조선대학교 의과대학 정형외과학교실) | Sang Hong Lee (Department of Orthopaedic Surgery, College of Medicine, Chosun University, Gwangju, Korea) Corresponding author