Your child will be given general anesthetic. We cut the bone and insert metal pins above and below the cut. A metal frame is attached to the pins to support the leg. Over weeks and months, the metal device is adjusted to gradually pull the bone apart to create space between the ends of the bones. New bone forms to fill in the space, extending the length of the bone. Once the lengthening process is completed and the bones have healed, your child will require one more short operation to remove the lengthening device. We will see your child regularly to monitor the leg and adjust the metal lengthening device. We may also refer your child to a physical therapist to ensure that he or she stays mobile and has full range of motion in the leg. Typically, it takes a month of healing for every centimeter that the leg is lengthened.
Some causes of leg length discrepancy (other than anatomical). Dysfunction of the hip joint itself leading to compensatory alterations by the joint and muscles that impact on the joint. Muscle mass itself, i.e., the vastus lateralis muscle, pushes the iliotibial band laterally, causing femoral compensations to maintain a line of progression during the gait cycle. This is often misdiagnosed as I-T band syndrome and subsequently treated incorrectly. The internal rotators of the lower limb are being chronically short or in a state of contracture. According to Cunningham's Manual of Practical Anatomy these are muscles whose insertion is lateral to the long axis of the femur. The external rotators of the hip joint are evidenced in the hip rotation test. The iliosacral joint displays joint fixations on the superior or inferior transverse, or the sagittal axes. This may result from many causes including joint, muscle, osseous or compensatory considerations. Short hamstring muscles, i.e., the long head of the biceps femoris muscle. In the closed kinetic chain an inability of the fibula to drop inferior will result in sacrotuberous ligament loading failure. The sacroiliac joint dysfunctions along its right or left oblique axis. Failure or incorrect loading of the Back Force Transmission System (the longitudinal-muscle-tendon-fascia sling and the oblique dorsal muscle-fascia-tendon sling). See the proceedings of the first and second Interdisciplinary World Congress on Low Back Pain. Sacral dysfunction (nutation or counternutation) on the respiratory axis. When we consider the above mentioned, and other causes, it should be obvious that unless we look at all of the causes of leg length discrepancy/asymmetry then we will most assuredly reach a diagnosis based on historical dogma or ritual rather than applying the rules of current differential diagnosis.
The patient/athlete may present with an altered gait (such as limping) and/or scoliosis and/or low back pain. Lower extremity disorders are possibly associated with LLD, some of these are increased hip pain and degeneration (especially involving the long leg). Increased risk of: knee injury, ITB syndrome, pronation and plantar fascitis, asymmetrical strength in lower extremity. Increased disc or vertebral degeneration. Symptoms vary between patients, some patients may complain of just headaches.
The most accurate method to identify leg (limb) length inequality (discrepancy) is through radiography. It?s also the best way to differentiate an anatomical from a functional limb length inequality. Radiography, A single exposure of the standing subject, imaging the entire lower extremity. Limitations are an inherent inaccuracy in patients with hip or knee flexion contracture and the technique is subject to a magnification error. Computed Tomography (CT-scan), It has no greater accuracy compared to the standard radiography. The increased cost for CT-scan may not be justified, unless a contracture of the knee or hip has been identified or radiation exposure must be minimized. However, radiography has to be performed by a specialist, takes more time and is costly. It should only be used when accuracy is critical. Therefore two general clinical methods were developed for assessing LLI. Direct methods involve measuring limb length with a tape measure between 2 defined points, in stand. Two common points are the anterior iliac spine and the medial malleolus or the anterior inferior iliac spine and lateral malleolus. Be careful, however, because there is a great deal of criticism and debate surrounds the accuracy of tape measure methods. If you choose for this method, keep following topics and possible errors in mind. Always use the mean of at least 2 or 3 measures. If possible, compare measures between 2 or more clinicians. Iliac asymmetries may mask or accentuate a limb length inequality. Unilateral deviations in the long axis of the lower limb (eg. Genu varum,?) may mask or accentuate a limb length inequality. Asymmetrical position of the umbilicus. Joint contractures. Indirect methods. Palpation of bony landmarks, most commonly the iliac crests or anterior iliac spines, in stand. These methods consist in detecting if bony landmarks are at (horizontal) level or if limb length inequality is present. Palpation and visual estimation of the iliac crest (or SIAS) in combination with the use of blocks or book pages of known thickness under the shorter limb to adjust the level of the iliac crests (or SIAS) appears to be the best (most accurate and precise) clinical method to asses limb inequality. You should keep in mind that asymmetric pelvic rotations in planes other than the frontal plane may be associated with limb length inequality. A review of the literature suggest, therefore, that the greater trochanter major and as many pelvic landmarks should be palpated and compared (left trochanter with right trochanter) when the block correction method is used.
Non Surgical Treatment
Treatment depends on what limb has the deformity and the amount of deformity present. For example, there may be loss of function of the leg or arm. Cosmetic issues may also be a concern for the patient and their family. If there are problems with the arms, the goal is to improve the appearance and function of the arm. Treatment of leg problems try to correct the deformity that may cause arthritis as the child gets older. If the problem is leg length, where the legs are not "equal," the goal is equalization (making the legs the same length). Treatment may include the use of adaptive devices, prosthesis, orthotics or shoe lifts. If the problem is more severe and not treatable with these methods, then surgery may be necessary.
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Leg shortening is employed when LLD is severe and when a patient has already reached skeletal maturity. The actual surgery is called an osteotomy , which entails the removal of a small section of bone in the tibia (shinbone) and sometimes the fibula as well, resulting in the loss of around an inch in total height. Leg lengthening is a difficult third option that has traditionally had a high complication rate. Recently, results have improved somewhat with the emergence of a technique known as callotasis , in which only the outer portion of the bone (the cortex ) is cut, (i.e. a corticotomy ). This allows the bone to be more easily lengthened by an external fixation device that is attached to either side of the cut bone with pins through the skin. The ?ex-fix,' as it is sometimes called, is gradually adjusted by an orthopaedic surgeon, and healing can occur at the same time that the leg is being distracted , or lengthened over time. Unlike epiphysiodesis, leg lengthening procedures can be performed at almost any skeletal or chronological age.