[Biomechanical evaluation of nickel-titanium shape-memory alloy enclosed interlocking intramedular nail].
OBJECTIVE
To study the biomechanical characteristics of Ni-Ti shape-memory alloy-enclosed interlocking intramedular nail Ni-Ti En for clinical application.


METHODS
Six transverse fractures were induced in 6 fresh humeral shafts and fixed with Ni-Ti En, plate, interlocking intramedullary nail, and Ender nail, respectively. The specimens then underwent stress analysis for comparison of the bending strength, twisting force, and flexibility.


RESULTS
The bending strength of Ni-Ti En was not significantly different from that of the plate and better than ender's nail; the twisting force of the interlocking intramedullary nail was comparable with the plate, but better than Ender nail.


CONCLUSIONS
Ni-Ti Enpossess good biomechanical property to meet the demand of osteosynthesis, and its less stress protection, freedom of distant nail locking, flexibility and stable fixation may accelerate fracture healing.
Cao
Yan-ming
YM
Department of Orthopedics, Second Affiliated Hospital of Guangzhou Medical College, Guangzhou 510260, China.
Zhao
Wei-dong
WD
Zhang
Mei-chao
MC
Bao
Kan
K
Da
Guo-zu
GZ
D001696:Biomechanical Phenomena; D001858:Bone Nails; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D006810:Humeral Fractures / Q000503:physiopathology / Q000601:surgery; D009532:Nickel; D014025:Titanium
C040654:titanium nickelide; D009532:Nickel; D014025:Titanium