pain and stiffness on the back of the right knee for half year

He has the pain and stiffness in the back of the right knee for half-year, he did many treatments with physio and acupuncture, but still had more pain and stiffness in the back of the right knee. we found the difference between two-foot (see photo), when both feet are the same, the pain and stiffness will be gone. so his problem is in the lower back, is nor in the right knee, so the bone setting is a good way for the case.