Yonghan Cha1, Ji-Ung Song2, Jun-Il Yoo3, Ki Hoon Park4, Jung-Taek Kim5, Chan Ho Park6, Won-Sik Choy1. 1. Department of Orthopaedic Surgery, Eulji University Hospital, Daejeon, South Korea. 2. Department of Orthopaedic Surgery, Chamjoen Hospital, Gwangju, South Korea. 3. Department of Orthopaedic Surgery, Gyeongsang National University Hospital, Jinju, South Korea. 4. Department of Orthopedic Surgery, Ajou University School of Medicine, Ajou Medical Center, 164, World cup-ro, Yeongtong-gu, 16499, Suwon-si, Gyeonggi-do, South Korea. 5. Department of Orthopedic Surgery, Ajou University School of Medicine, Ajou Medical Center, 164, World cup-ro, Yeongtong-gu, 16499, Suwon-si, Gyeonggi-do, South Korea. orthopedist7@ajou.ac.kr. 6. Department of Orthopaedic Surgery, Yeungnam University Medical Center, Daegu, South Korea.
Abstract
BACKGROUND: The depth of bolt in Femoral neck system (FNS, DePuy Synthes, Oberdorf, Switzerland) is difficult to finely control as the length of the bolt is in units of 5 mm. Thus, this study introduces a method to control the depth of FNS bolt in analogue scale in patients with femoral neck fracture. METHODS: By the technique of control of reaming and retraction of bolt, the tip of implant could be positioned close to subchondral bone without harming it. The position of implant tip in four cases in which the introduced technique was applied was compared to that of eight cases where the standard technique was performed. RESULTS: The average tip-apex distance measured in the cases that underwent surgery using the suggested technique in this study was statistically significantly shorter than that measured in the cases that underwent surgery under manufacturer guidelines. CONCLUSION: Even though the bolt of FNS is manufactured in the unit of 5 mm, the technique proposed in this study helps surgeons to adjust the depth of bolt for the fixation of femoral neck fracture using FNS.
BACKGROUND: The depth of bolt in Femoral neck system (FNS, DePuy Synthes, Oberdorf, Switzerland) is difficult to finely control as the length of the bolt is in units of 5 mm. Thus, this study introduces a method to control the depth of FNS bolt in analogue scale in patients with femoral neck fracture. METHODS: By the technique of control of reaming and retraction of bolt, the tip of implant could be positioned close to subchondral bone without harming it. The position of implant tip in four cases in which the introduced technique was applied was compared to that of eight cases where the standard technique was performed. RESULTS: The average tip-apex distance measured in the cases that underwent surgery using the suggested technique in this study was statistically significantly shorter than that measured in the cases that underwent surgery under manufacturer guidelines. CONCLUSION: Even though the bolt of FNS is manufactured in the unit of 5 mm, the technique proposed in this study helps surgeons to adjust the depth of bolt for the fixation of femoral neck fracture using FNS.
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