[Biomechanical study and clinical application of cannulated compression screws with across solid frame for intertrochanteric fractures].
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.
Zhang
Jian-zheng
JZ
Department of Orthopedic Surgery, Beijing Army General Hospital, Beijing 100700, China.
Sun
Tian-sheng
TS
Liu
Zhi
Z
Liu
Shu-qing
SQ
Guo
Yong-zhi
YZ
Ren
Ji-xin
JX
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