Right knee pain caused by left hip and pelvis! What???
A concept called “crossover gait” has been around for a long time in running circles (at least since 1994, as noted in a medical article, “Relationship between foot placement and mediolateral ground reaction forces during running–Clinical Biomechanics March 9, 1994”. Here is the definition of crossover gait: The runner places the weight bearing foot under the center of the body or across the center to the opposite side. It happens with same sided hip weakness and opposite abdominal weakness.
The idea of crossover gait also happens with walking as well as running, but the consequences can be different. In the video shown above, the client’s left pelvis is higher than her right when she is, at the same time, putting weight through her left hip and leg as she lifts the right leg to place it onto the step. She SHOULD be contracting her left glut muscles and right abdominals at the same time to assist in lifting the right leg, (whether stepping up onto a step of taking a step forward) but she does not. Instead her left pelvis shifts to the left and the right side of the pelvis drops as she lifts her right leg. This causes her to have to fold her right knee into a knock knee position. THAT will cause knee pain.
If you watch the video, you can see she has been taught to lift her right pelvis and contract her left side glut muscles, which raises her right pelvis allowing the right knee to unfold to a straight position from a knock knee position!