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Useful Information Relating To Foot Problems

Leg Length Discrepancy Following Hip Replacement Surgery


Many people undergo surgery for various reasons - arthritis, knee replacement, hip replacement, even back surgery. However, the underlying cause of leg length inequality still remains. So after expensive and painful surgery, follow by time-consuming and painful rehab, the true culprit still remains. Resuming normal activities only continues to place undue stress on the already overloaded side. Sadly so, years down the road more surgeries are recommended for other joints that now endure the excessive forces.Leg Length Discrepancy


Leg discrepancy can develop from a medical issue in any portion of the femur or tibia. One leg may lengthen, but leg shortening is much more common. Factors that can cause leg length discrepancy include inherited growth deficiencies. Infections. A bone infection can cause delayed growth in the affected limb. Injury. If your child breaks a leg, it may be shorter once it heals. This is most likely to happen if the fracture or break was complicated, an open fracture, or an injury that affected the growth plate near the end of the bone. Alternatively, a break can cause bones to grow faster after healing, making a leg longer. Tumors. Legg-Calve-Perthes disease. This is a condition that affects the ball (femoral head) of the hip joint. The femoral head may be friable and damage easily, sometimes leading to shortening of the thigh bone. Hemihypertrophy. In children with this condition, one side of the body grows more quickly than the other. Vascular malformations. These are abnormal clusters of veins and arteries that can form close to the bone and stimulate growth. Juvenile arthritis. Inflammation from arthritis can stimulate growth in the affected leg and cause discrepancy.


Many people walk around with LLD?s of up to 2 cm. and not even know it. However, discrepancies above 2 cm. becomes more noticeable, and a slight limp is present. But even up to 3 cm. a small lift compensates very well, and many patients are quite happy with this arrangement. Beyond 3 cm. however, the limp is quite pronounced, and medical care is often sought at that point. Walking with a short leg gait is not only unsightly, but increases energy expenditure during ambulation. It could also put more stress on the long leg, and causes functional scoliosis. Where the discrepancy is more severe, walking becomes grotesque or virtually impossible.


A systematic and well organized approach should be used in the diagnosis of LLD to ensure all relevant factors are considered and no clues are overlooked which could explain the difference. To determine the asymmetry a patient should be evaluated whilst standing and walking. During the process special care should be used to note the extent of pelvic shift from side to side and deviation along the plane of the front or leading leg as well as the traverse deviation of the back leg and abnormal curvature of the spine. Dynamic gait analysis should be conducted during waling where observation of movement on the sagittal, frontal and transverse planes should be noted. Also observe head, neck and shoulder movements for any tilting.

Non Surgical Treatment

In order to measure for correction, use a series of blocks or sheets of firm material (cork or neoprene) of varying thickness, e.g., 1/8", 1/4", and 1/2". Place them under the short limb, either under the heel or the entire foot, depending on the pathology, until the patient feels most balanced. Usually you will not be able to correct for the full amount of the imbalance at the outset. The longer a patient has had the LLD, the less likely he or she will be able to tolerate a full correction immediately. This is a process of incremental improvements. 2 inch External Platform Lift Bear in mind that the initial lift may need to be augmented as the patient's musculoskeletal system begins to adjust. It is often recommended that the initial buildup should be 50 percent of the total. After a suitable break-in period, one month say, another 25 percent can be added. If warranted, the final 25 percent can be added a month later. Once you determine how much lift the patient can handle, you then need to decide how to best apply it. There are certain advantages and disadvantages to using either internal or external heel lifts.

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Surgical Treatment

Bone growth restriction (epiphysiodesis) The objective of this surgical procedure is to slow down growth in the longer leg. During surgery, doctors alter the growth plate of the bone in the longer leg by inserting a small plate or staples. This slows down growth, allowing the shorter leg to catch up over time. Your child may spend a night in the hospital after this procedure or go home the same day. Doctors may place a knee brace on the leg for a few days. It typically takes 2 to 3 months for the leg to heal completely. An alternative approach involves lengthening the shorter bone. We are more likely to recommend this approach if your child is on the short side of the height spectrum.