Three-dimensional finite element analysis on the novel absorbable screw and traditional screw for fixing Lange-Hansen type 1 medial malleolus fracture

doi:10.3969/j.issn.2095-4344.0793

Abstract

Abstract:

BACKGROUND: Poly L-lactic acid, as a novel biological material, has been used in the field of orthopedics with good histocompatibility. Poly L-lactic acid can be absorbed by tissue, without secondary surgery, and do not react with the surrounding tissue. The elastic modulus of the absorbable material is close to the bone, which is more beneficial to the healing of the fracture. However, biomechanical aspects of absorbable screws have not been adequately described in the present literature.

OBJECTIVE: To investigate the feasibility of novel absorbable screw fixation in repair of Lauge-Hansen type 1 medial malleolus fractures using three-dimensional finite element technology.

METHODS: A Lange-Hansen type 1 medial malleolus fracture models were established by using the CT scan data, and fixed by the novel absorbable screws, novel metal screws and traditional metal screw. Finite element analysis software was used to get the stress value and displacement.

RESULTS AND CONCLUSION: (1) There were totally 36 240 units, 7 660 nodes in the novel absorbable screw fixation model under 450 N force; the maximum stress of screws was 46.78 MPa; the maximum displacement was 0.239 mm; the maximum displacement of the distal fracture was 0.248 mm. (2) There were totally 36 240 units, 7 660 nodes under 450 N force in the novel type metal screws fixation model; the maximum stress of screws was 46.49 MPa; the maximum displacement was 0.223 mm; the maximum displacement of the distal fracture was 0.214 mm. (3) There were totally 41 236 units, 8 121 nodes under 450 N force in the traditional metal screws fixation model; the maximum stress of screws was 59.08 MPa; the maximum displacement was 0.182 mm; the maximum displacement of the distal fracture was 0.207 mm. (4) The novel absorbable screws used in Lange-Hansen type 1 medial malleolus fracture obtained uniform total stress distribution, and small possibility of screw breakage. (5) The experiment verifies the biomechanical feasibility of absorbable screws for simple medial malleolus fracture. For Lange-Hansen type 1 medial malleolus fracture, novel absorbable screw is an alternative choice for clinical doctors.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Finite Element Analysis, Biomechanics, Ankle, Fractures, Bone, Stress, Mechanical, Tissue Engineering

CLC Number:

R318

Chen Fan-cheng, Yu Bao-qing, Shi Ji-fei, Ao Rong-guang, Zhang Xu, Li De-jian, Qian Zhi . Three-dimensional finite element analysis on the novel absorbable screw and traditional screw for fixing Lange-Hansen type 1 medial malleolus fracture [J]. Chinese Journal of Tissue Engineering Research, 2018, 22(19): 3027-3032.

Figures/Tables 2

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