Three-dimensional motion analysis of lumbo-pelvic rhythm during trunk lateral bending 1

The hip and spine coordination known as lumbo-pelvic rhythm (LPR), is only reported in trunk extension movement measured by a lumbar hip ratio (LHR), a ratio of the lumbar movement to the hip movement. This study measured real-time LHR during trunk lateral bending of the young healthy male by the three-dimensional motion analysis system (VICON). The LHR during trunk lateral bending was 4.4. This is the first study revealing LHR of the trunk lateral bending, showing that lumbar spine laterally bend 4.4° while the hip bend 1° ipsilaterally.