Dynamic effect of three locking plates fixated to humeral fracture based on multibody musculoskeletal model

• Published in: The international journal of medical robotics + computer assisted surgery 2021-12, Vol.17 (6), p.e2323-n/a
• Main Authors: Peng, Matthew, Chen, Chin‐Tu, MA, LiMin, JU, Xiangyang, Khambay, Balvinder
• Format: Article
• Language: English
• Subjects: AnyBody; Biomechanical engineering; Biomechanics; Boundary conditions; Computed tomography; Displacement; double plates; Elbow (anatomy); Finite element method; Fixtures; Fractures; Image reconstruction; Locking; Mathematical models; multibody; Multibody systems; musculoskeletal; Parallel plates; Three dimensional models; T‐fracture
• ISSN: 1478-5951; 1478-596X
• DOI: 10.1002/rcs.2323

Objective This study attempts to analyse the biomechanical effect of internal fixation (plated in parallel or plated vertically) on the basis of distal humeral fractures on musculoskeletal multibody dynamics using AnyBody in Finite Element Method. Method Humeral 3D models were reconstructed by MIMICS after volunteers' CT image input in *.dicom format, and processed by Geomagic Studio for surfaces, while locking plates and screws were then designed by Pro‐E. A humeral model of T‐type fracture was created and assembled in Hypermesh, to integrate fixtures (e.g., MPL/PML/ML), to grid the mesh and then assign materials. A musculoskeletal model of the upper limb was established by AnyBody to simulate elbow flexion and extension. They were finally imported to Abaqus for boundary conditions and dynamic analysis. Result In terms of Von Mises stress, its maximum increased and then decreased gradually during the joint motion, but p > 0.05 in SPSS suggests no significant difference for all three fixtures. In terms of displacement, when the elbow was at 90°, each motional pattern reached its peak as follows: ML180° = 0.28 mm, MPL90° = 0.49 mm & PML90° = 0.54 mm during flexion; ML180° = 0.073 mm, MPL90° = 0.10 mm & PML90° = 0.12 mm during extension. p