title: [Biomechanical study and clinical application of cannulated compression screws with across solid frame for intertrochanteric fractures].
abstract: OBJECTIVE
  To evaluate the safety and efficiency of treating the senile intertrochanteric fractures with cannulated compression screws (CCS) with across solid frame in femur head via biomechanical tests and clinical application.
  
  
  METHODS
  Biomechanical tests: the fracture model was made in 31-A1.3 style, 6 pairs of flesh and embalmed cadaveric femurs were mechanically tested in a single-limb stance configuration. A material testing machine was used to apply vertical loads onto the femoral head. Both stiffness and reverse turn were recorded. Clinical application: from 1998 to 2006, According to damage control orthopedics (DCO) and American Society of Anesthesiologists (ASA) and the Evans classification, 51 patients received treatment with CCS with across solid flame in femur head. All the cases were followed up for 12 to 36 months (mean: 18 months).
  
  
  RESULTS
  the differences between two groups in BMD (bone mineral density) were of statistical significance. And tensile rigidity and torsional rigidity of CCS were strong enough to bear weight. The CCS group had a lesser amount of blood loss or transfusion and lower treatment expenses.
  
  
  CONCLUSIONS
  Cannulated compression screw with across solid flame is strong enough to be employed as an effective method to treat aged intertrochanteric hip fractures with the advantages of simple procedure, minimal invasion, stable fixation and weight bearing.
authors.affiliation: Department of Orthopedic Surgery, Beijing Army General Hospital, Beijing 100700, China.
authors.forename: Jian-zheng
authors.initials: JZ
authors.lastname: Zhang
authors.forename: Tian-sheng
authors.initials: TS
authors.lastname: Sun
authors.forename: Zhi
authors.initials: Z
authors.lastname: Liu
authors.forename: Shu-qing
authors.initials: SQ
authors.lastname: Liu
authors.forename: Yong-zhi
authors.initials: YZ
authors.lastname: Guo
authors.forename: Ji-xin
authors.initials: JX
authors.lastname: Ren
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D001863:Bone Screws; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans; D016268:Internal Fixators; D008297:Male; D008875:Middle Aged