A biomechanical study of femoral neck fracture fixation with the VHS Vari-Angle Hip Fixation System.
Femoral neck fracture fixation with a new device, the VHS Vari-Angle Hip Fixation System (Biomet Orthopaedics Inc, Warsaw, IN), was studied in 14 fresh-frozen cadaver femurs. A Pauwels class III fracture was simulated in these femurs. Seven femurs were fixed by placing the screw at a high (150 degrees) angle to the femoral axis; the other 7 femurs were fixed by placing the screw at a low (135 degrees) angle to the femoral axis. Mean compressive failure load was found to be significantly higher for the high-angle group than for the low-angle group. We concluded that compared with a low-angle screw placement (135 degrees), high-angle screw placement (150 degrees) results in a biomechanically stronger fixation.
Chaim
Solomon H
SH
Orthopaedic Surgery, Louisiana State University Health Sciences Center, Shreveport, Louisiana, USA.
Mukherjee
Debi P
DP
Ogden
Alan L
AL
Mayeux
Raymond H
RH
Sadasivan
Kalia K
KK
Albright
James A
JA
D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D001863:Bone Screws; D002102:Cadaver; D005265:Femoral Neck Fractures / Q000503:physiopathology* / Q000601:surgery; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D008875:Middle Aged; D016896:Treatment Outcome; D016474:Weight-Bearing