ObjectiveTo discuss the biomechanical stability of locked reconstruction plate for internal fixation of transverse and posterior wall acetabular fracture so as to provide a reliable basis for clinical application. MethodsThe models of transverse and posterior wall acetabular fracture were established in 16 anti-corrosion acetabular specimens from 8 adult cadavers, which were randomly divided into experimental group and control group (n=8). Fracture was fixed with 10-hole posterior column locked reconstruction plate in the experimental group, and with 10-hole posterior column reconstruction plate combined with anterior column lag screw and posterior wall screws in the control group. Biomechanical testing machine was used for loading of 5/6 donor body mass the specimen in a speed of 15 N/s; the loading time was calculated and vertical loading.The longitudinal and quadrilateral body displacements of fracture were recorded to compare the biomechanical stability was performed. ResultsThe quadrilateral body displacement of the experimental group[(1.99±0.32) mm] was greater than that of the control group[(1.75±0.22) mm], but there was no significant difference (t=-1.735, P=0.105). The longitudinal displacement[(1.56±049) mm] and the displacement of the posterior wall fracture block[(0.86±0.33) mm] in the experimental group were lower than those of the control group[(1.64±0.51) and (1.01±0.35) mm], showing no significant difference between 2 groups (t=0.293, P=0.772; t=1.516, P=0.154). ConclusionFor transverse and posterior wall acetabular fracture, application of locked reconstruction plate can provide sufficient biomechanical stability, reduce the risk of screw placement to acetabular joints.