Any and all. Any joint in your body, from the joints in your neck and back, your ribs, knees, elbows, knees, hands and feet, toes and fingers, pelvis, joints between cranial and facial bones, etc, can be treated with manual medicine techniques such as osteopathic manipulation. Osteopathic medical students begin learning these in their first year and many dos use them throughout their careers.
Manual therapy. Essentially any joint that moves can be treated this way.