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academies
International Surgery and Ortho Conference
October 25-26, 2017 | Toronto, Canada
Case Rep Surg Invasive Proced 2017 | Volume 1 Issue 3
Stability of femoral neck osteosynthesis: Comparison of different cannulated screws configurations
Renjie Xu
Suzhou Municipal Hospital, China
Objective:
The objective of this study was to compare the
biomechanical characteristics of three cannulated screws in
paralleled and non-paralleled (including crossed and divergent)
configuration in treating femoral neck fractures, also to
identify the association between bone mineral density and
biomechanical characteristics in the femoral neck fractures
using three cannulated screws.
Methods:
Thirty-six femurs of human cadavers were divided
into three groups (each group included 12 femurs). The bone
mineral density of all the specimens was tested. Femoral neck
fractures were simulated in all the specimens, followed by
osteosynthesis using three cannulated screws in three kinds of
configurations. Load test and torsion test were used to evaluate
the biomechanical characteristics. Axial load test included
single progressive test, cyclic fatigue test and destructive test.
Torsion test included single progressive test and destructive
test. Multiple linear regression models were constructed to
analyze the statistics.
Results:
Only when axial load was small (200N and 400N)
in single progressive test, the results showed no significant
difference between crossed group and divergent group. After
the adjustment for bone mineral density, other axial load tests
showed paralleled group excelled divergent group, divergent
group excelled crossed group. After the adjustment for bone
mineral density, other torsion tests showed paralleled group
excelled crossed group, crossed group excelled divergent group.
After adjustment for configuration of cannulated screws, the
greater the bone mineral density, the stronger will be the axial
and anti-rotation strength.
Conclusion:
Both the configuration of cannulated screws and
bone mineral density can affect the axial strength and anti-
rotation strength. The configuration appears to be even more
weighted than bone mineral density.
Speaker Biography
Xu Renjie is an Associate Chief Physician in Orthopedic Department of SuzhouMunicipal
Hospital. He graduated with a Medical Doctor degree from Peking University in 2009.
After graduation, he has worked in Suzhou Municipal Hospital, major in Trauma of
Bone and Joint.
e:
fredxurj@sina.com