| Objective To design a novel wrist joint prosthesis based on anatomical morphological data of the Southwestern Chinese population and evaluate its mechanical performance through cadaver experiments and finite element analysis.Methods A finite element model of the wrist joint prosthesis was constructed by using Mimics, Geomagic Studio, SolidWorks, and ANSYS software, based on CT data from a healthy young male volunteer. The model comprised 12 carpal bones and 3 prosthetic components, with a total of 365 425 tetrahedral elements. Cadaver experiments were conducted to measure the range of motion after prosthesis implantation and validate its biomechanical performance. Finite element analysis simulated static grip strength in four directions: palmar flexion, dorsiflexion, ulnar deviation, and radial deviation. Changes in overall stress and strain of the wrist joint before and after prosthesis implantation, as well as stress distribution within the prosthesis, were analyzed.Results After prosthesis implantation, total wrist deformation decreased in all directions, with the greatest reduction observed in palmar flexion (from 12.396 mm to 2.894 2 mm). Total peak stress increased from 196.58 MPa to 478.11 MPa in palmar flexion, whereas in ulnar deviation, it increased only from 167.81 MPa to 194.92 MPa. Stress distribution within the prosthesis was uniform, with a maximum stress of 478.11 MPa occurring in palmar flexion.Conclusion The novel wrist joint prosthesis demonstrated favorable mechanical performance in finite element analysis. Combined with cadaveric experimental results, the overall deformation and stress of the wrist joint decreased significantly after implantation, with a uniform stress distribution within the prosthesis that did not exceed the yield strength of the material. These results suggest that this prosthesis design has the potential to improve the stability and durability of wrist replacement surgery. |
