title: A radiographic simulation study of fixed superior pubic ramus fractures with retrograde screw insertion.
abstract: OBJECTIVE
  The study's aim is to calculate the parameters for retrograde insertion points for fixed superior pubic ramus fractures.
  
  
  METHODS
  From the pubic symphysis, diameter and length of the screw were measured, as well as the angle between the screw axis and the 3 planes.
  
  
  RESULTS
  When the diameter was fixed at 4.5 mm, the maximum lengths were 125 mm and 119 mm.
  
  
  CONCLUSIONS
  When the fracture occurs in Zone I, the penetration point could be selected in the pubic symphysis pubis angle to ensure that medial fracture fragments have sufficient screw channel length.
authors: Department of Orthopedic Surgery, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing Key Lab of Regenerative Medicine in Orthopedics, General Hospital of Chinese People's Liberation Army, 28 FuXing Road, Beijing 100853, People's Republic of China.
authors: Qi
authors: Q
authors: Quan
authors: Department of Orthopedic Surgery, First Affiliated Hospital of PLA General Hospital, 51 FuCheng Road, Beijing 100048, People's Republic of China.
authors: Lei
authors: L
authors: Hong
authors: Department of Orthopedic Surgery, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing Key Lab of Regenerative Medicine in Orthopedics, General Hospital of Chinese People's Liberation Army, 28 FuXing Road, Beijing 100853, People's Republic of China.
authors: Biao
authors: B
authors: Chang
authors: Department of Orthopedic Surgery, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing Key Lab of Regenerative Medicine in Orthopedics, General Hospital of Chinese People's Liberation Army, 28 FuXing Road, Beijing 100853, People's Republic of China.
authors: Ruo Xi
authors: RX
authors: Liu
authors: Department of Orthopedic Surgery, Yangpu Hospital, Tongji University School of Medicine, 450 Tengyue Road, Shanghai, People's Republic of China.
authors: Ying Qi
authors: YQ
authors: Zhang
authors: Department of Orthopedic Surgery, First Affiliated Hospital of PLA General Hospital, 51 FuCheng Road, Beijing 100048, People's Republic of China.
authors: Qing
authors: Q
authors: Zhao
authors: Department of Orthopedic Surgery, Key Laboratory of Musculoskeletal Trauma & War Injuries PLA, Beijing Key Lab of Regenerative Medicine in Orthopedics, General Hospital of Chinese People's Liberation Army, 28 FuXing Road, Beijing 100853, People's Republic of China.
authors: Shi Bi
authors: SB
authors: Lu
keywords: Percutaneous retrograde insertion; Safe zone; Superior pubic ramus fractures