Objective　To design a new lumbosacral anterior plate by statistical analysis for the numerical value of the anatomic structure in Chinese.  　Methods　The numerical value of lumbosacral angle and height of lumbosacral vertebrae

and discus intervertebralis were measured in 350 orthotropia and lateral view Xray pictures of lumbosacral vertebrae of adult normal individuals. According to the acquired amplitude of lumbosacral vertebrae in Chinese

we designed the modified lumbosacral anterior p

late

and then tested the plate in 4 different states of working condition on 8 fresh spinal columns to assay biomechanical data

and the results were compared with those of lumbosacral anterior secure plate (PACH).  　Results　The amplitude of lumbosacral angle were 125  to 135

the heights of anterior border L

5

and S

1

vertebrae were (27.06±2.30） and (22.3±2.8）mm

the height of L

5

S

1

discus intervertebralis was (8.2±0.3)mm. The flex bias and the compression rigidity had significant deviation for the vertebral column fixed the modified plate [flexation (4.706±0.012)mm

extension （4.549±0.298）mm

lateral bending （5.412±0.384）mm

average value of rigidity in 400 N （105.8±7.6）N/mm

]

and PACH[flexation （5.241±0.113） mm

extension (5.662±0.246)mm

lateral bending （6.767±0.017）mm

and average value of rigidity (87.4±4.2）N/mm

]

respectively

with statistical significance among them (P0.05).  　Conclusion　The modified lumbosacral anterior plate system accommodates the anatomic structure of lumbosacral vertebrae in Chinese

possesses conspicuous stability

and is suitable for reconstruction of lumbosacral vertebrae in indicated patients.