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báo cáo hóa học:" A comparison of two headless compression screws for operative treatment of scaphoid fractures"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : A comparison of two headless compression screws for operative treatment of scaphoid fractures | Grewal et al. Journal of Orthopaedic Surgery and Research 2011 6 27 http www.josr-online.eom content 6 1 27 JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH RESEARCH ARTICLE Open Access A comparison of two headless compression screws for operative treatment of scaphoid fractures Ruby Grewal Joseph Assini David Sauder Louis Ferreira Jim Johnson and Kenneth Faber Abstract Purpose The purpose of this study was to compare the interfragmentary compression force across a simulated scaphoid fracture by two commonly used compression screw systems the Acutrak 2 Standard and the 3.0 mm Synthes headless compression screw. Methods Sixteen 8 pairs 6 female 2 male cadaver scaphoids were randomly assigned to receive either the Acutrak 2 or Synthes screw with the contralateral scaphoid designated to receive the opposite. Guide wires were inserted under fluoroscopic control. Following transverse osteotomy the distal and proximal fragments were placed on either side of a custom load cell to measure interfragmentary compression. Screws were placed under fluoroscopic control using the manufacturer s recommended surgical technique. Compressive forces were measured during screw insertion. Recording continued for an additional 60s in order to measure any loss of compression after installation was complete. The peak and final interfragmentary compression were recorded and paired t-tests performed. Results The mean peak compression generated by the Acutrak 2 Standard was greater than that produced by the Synthes compression screw 103.9 33.2 N vs. 88.7 38.6 N respectively p 0.13 . The mean final interfragmentary compression generated by the Acutrak 2 screw 68.6 36.4 N was significantly greater p 0.04 than the Synthes screw 37.2 26.8 N . Specimens typically reached a steady state of compression by 120-150s after final tightening. Conclusion Peak interfragmentary compression observed during screw installation was similar for both screw systems. However the mean interfragmentary compression .