Un-leveling of the hips and pelvis is NOT normal but very common. There are 2 types of Leg length discrepancies; Functional and Structural. Functional LLD is most common, and occurs due to poor foot and body mechanics, weak hips and core muscles, or a scoliosis curvature in the back. Improper posture may also create this issue. Diligent strength and flexibility work, massage, Chiropractic and improving foot mechanics with orthotics or lifts will often correct the deformity and prevent long term dysfunction of the lower back and pelvis. Structural LLD is less common, but occurs from a true difference in the lengths of the lower leg bones (tibia and femur). This may have come from a fracture which caused shortening, or if a joint replacement surgery has changed the lengths of the legs. A lift in or on the shoe of the short side is imperative to reduce any further damage to other joints in the lower extremity or spine.