In-vitro 3D Analysis of Sacroiliac Joint Kinematics: Primary and Coupled Motions

Conclusion. A nontrivial amount of rotation and translation occurred out of the expected axis of motion. The largest amount of off-axis rotation was observed in lateral bending. Relative to resultant translation, in-plane translation was lowest in lateral bending. Our results indicate that rotation of the SIJ is not fully described with the in-plane metrics which are normally reported in evaluation of fusion devices. Future studies of the SIJ may need to consider including off-axis rotation measurements when describing SIJ kinematics. Level of Evidence: 5
Source: Spine - Category: Orthopaedics Tags: BIOMECHANICS Source Type: research