Abstract: Objective　To study the stress distribution of the scapholunate interosseous ligament(SLIL) of the wrist joint during different movements of the wrist by established a three-dimensional finite element model of the wrist joint.　Methods　The CT data of normal wrist joints were selected and imported into Mimics software to construct a three-dimensional finite element model of the wrist joint.. The SLIL stress distribution of the wrist joint under different motion directions was analyzed.　Results　With the increasing of the dorsiflexion angle, the SLIL stress increased. When the dorsiflexion angle increased to 90°, the maximum stress of SLIL was 1.3787 MPa. When the dorsiflexion angle was 30°, the maximum stress of SLIL was 0.1596 MPa. When the angle of palmar curvature increased to 90°, the maximum stress of SLIL reduced to 0.2452 MPa. The maximum stress of SLIL was 0.8145 MPa at 25° radial deviation, and 0.1356 MPa at 25° ulnar deviation. The maximum stress of SLIL was 0.4465 MPa when the radial force was applied to the wrist joints at 20 N, and 0.4635 MPa when the ulnar force was applied at 20 N.　Conclusions　The three-dimensional finite element model of the wrist joint can simulate the force of SLIL in different wrist movements. The stress of SLIL is maximum when the wrist joint dorsiflexion angle reaches 90°. When doing ulnar deviation and radial deviation, the maximum stress of SLIL radial deviation is about 6 times of the maximum stress of ulnar deviation at the same deflection angle.

Key words: Carpal joints, 　Scaphoid bone, 　Lunate bone, 　Interosseous ligament, 　Finite element analysis