[An invitro biomechanical study of treatment for lumbar spondylolithesis using nail-grooved tail steel plate and intervertebral implant (Wendeng Fusion Cage, WDFC)].
OBJECTIVE
To evaluate the biomechanics of treatment for lumbar spondlolisthesis using nail-grooved tail steel plate and WDFC (Wendeng Fusion Cage) implant.


METHODS
There were nine permanent waist-sacrum wet bone (L3-S3) in 1 to 2 clay-cold hours including 6 men and 3 women. They were seldom separated into 3 groups, which were fixed by nail-grooved fail plus WDFC. The model was separate into two kinds for single and across. With electrometry, deal experiment date with Graftool software. Each piece should be tested twice respectively.


RESULTS
The single and across segment non-destructive compression experiment. No-mid-compression from 0 to 750 N,the related coefficient and curves had no obvious change on inclined rate. In the single segment curvedly serial experiment, the stress at all point measured by two sides steel plate-was mostly linear growth. In the across segment curvedly serial experiment, the inclined rate become big and appear anisomerous.


CONCLUSIONS
It's proved by biomechanics that the steel plates with single furrow and cylinder wing plus WDFC has a good stability to cure lumbar vertebra slips.
Tan
Yuan-chao
YC
Wendeng Orthopaedics and Traumotology Hospital, Wendeng 264400, Shandong, China.
Ju
Chuan-guang
CG
Sun
Xiu-chen
XC
Wang
Zeng-mei
ZM
D000328:Adult; D001696:Biomechanical Phenomena; D001858:Bone Nails; D001860:Bone Plates; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000601:surgery*; D008297:Male; D013123:Spinal Fusion / Q000295:instrumentation*; D013168:Spondylolisthesis / Q000503:physiopathology / Q000601:surgery*