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workablephiloso30

Functional Leg Length Discrepancy Symptoms

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Many people don?t realise it, but one of their legs is longer (or shorter) than the other one. Over time, this can lead to degenerative osteoarthritis (OA) in the hip joint requiring a hip replacement. But the surgeon can?t just take the old hip joint out and put the new implant in. Careful planning, special surgical techniques, and adjusting of the implant component parts are important in preventing continuation or even worsening of the leg length discrepancy.Leg Length Discrepancy

Causes

Some limb-length differences are caused by actual anatomic differences from one side to the other (referred to as structural causes). The femur is longer (or shorter) or the cartilage between the femur and tibia is thicker (or thinner) on one side. There could be actual deformities in one femur or hip joint contributing to leg length differences from side to side. Even a small structural difference can amount to significant changes in the anatomy of the limb. A past history of leg fracture, developmental hip dysplasia, slipped capital femoral epiphysis (SCFE), short neck of the femur, or coxa vara can also lead to placement of the femoral head in the hip socket that is offset. The end-result can be a limb-length difference and early degenerative arthritis of the hip.

Symptoms

LLD do not have any pain or discomfort directly associated with the difference of one leg over the other leg. However, LLD will place stress on joints throughout the skeletal structure of the body and create discomfort as a byproduct of the LLD. Just as it is normal for your feet to vary slightly in size, a mild difference in leg length is normal, too. A more pronounced LLD, however, can create abnormalities when walking or running and adversely affect healthy balance and posture. Symptoms include a slight limp. Walking can even become stressful, requiring more effort and energy. Sometimes knee pain, hip pain and lower back pain develop. Foot mechanics are also affected causing a variety of complications in the foot, not the least, over pronating, metatarsalgia, bunions, hammer toes, instep pain, posterior tibial tendonitis, and many more.

Diagnosis

The evaluation of leg length discrepancy typically involves sequential x-rays to measure the exact discrepancy, while following its progression. In addition, an x-ray of the wrist allows us to more carefully age your child. Skeletal age and chronological age do not necessarily equal each other and frequently a child's bone age will be significantly different than his or her stated age. Your child's physician can establish a treatment plan once all the facts are known: the bone age, the exact amount of discrepancy, and the cause, if it can be identified.

Non Surgical Treatment

You may be prescribed a heel lift, which will equal out your leg length and decrease stress on your low back and legs. If it?s your pelvis causing the leg length discrepancy, then your physical therapist could use your muscles to realign your pelvis and then strengthen your core/abdominal region to minimize the risk of such malalignment happening again. If you think that one leg may be longer than the other and it is causing you to have pain or you are just curious, then make an appointment with a physical therapist.

Leg Length

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Surgical Treatment

Surgical operations to equalize leg lengths include the following. Shortening the longer leg. This is usually done if growth is already complete, and the patient is tall enough that losing an inch is not a problem. Slowing or stopping the growth of the longer leg. Growth of the lower limbs take place mainly in the epiphyseal plates (growth plates) of the lower femur and upper tibia and fibula. Stapling the growth plates in a child for a few years theoretically will stop growth for the period, and when the staples were removed, growth was supposed to resume. This procedure was quite popular till it was found that the amount of growth retarded was not certain, and when the staples where removed, the bone failed to resume its growth. Hence epiphyseal stapling has now been abandoned for the more reliable Epiphyseodesis. By use of modern fluoroscopic equipment, the surgeon can visualize the growth plate, and by making small incisions and using multiple drillings, the growth plate of the lower femur and/or upper tibia and fibula can be ablated. Since growth is stopped permanently by this procedure, the timing of the operation is crucial. This is probably the most commonly done procedure for correcting leg length discrepancy. But there is one limitation. The maximum amount of discrepancy that can be corrected by Epiphyseodesis is 5 cm. Lengthening the short leg. Various procedures have been done over the years to effect this result. External fixation devices are usually needed to hold the bone that is being lengthened. In the past, the bone to be lengthened was cut, and using the external fixation device, the leg was stretched out gradually over weeks. A gap in the bone was thus created, and a second operation was needed to place a bone block in the gap for stability and induce healing as a graft. More recently, a new technique called callotasis is being use. The bone to be lengthened is not cut completely, only partially and called a corticotomy. The bone is then distracted over an external device (usually an Ilizarov or Orthofix apparatus) very slowly so that bone healing is proceeding as the lengthening is being done. This avoids the need for a second procedure to insert bone graft. The procedure involved in leg lengthening is complicated, and fraught with risks. Theoretically, there is no limit to how much lengthening one can obtain, although the more ambitious one is, the higher the complication rate.

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