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.
Leg length discrepancies can be caused by: hip and knee replacements, lower limb injuries, bone diseases, neuromuscular issues and congenital problems. Although discrepancies of 2 cm or less are most common, discrepancies can be greater than 6 cm. People who have LLD tend to make up for the difference by over bending their longer leg or standing on the toes of their shorter leg. This compensation leads to an inefficient, up and down gait, which is quite tiring and over time can result in posture problems as well as pain in the back, hips, knees and ankles.
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.
Asymmetry is a clue that a LLD is present. The center of gravity will shift to the short limb side and patients will try to compensate, displaying indications such as pelvic tilt, lumbar scoliosis, knee flexion, or unilateral foot pronation. Asking simple questions such as, "Do you favor one leg over the other?" or, "Do you find it uncomfortable to stand?" may also provide some valuable information. Performing a gait analysis will yield some clues as to how the patient compensates during ambulation. Using plantar pressure plates can indicate load pressure differences between the feet. It is helpful if the gait analysis can be video-recorded and played back in slow motion to catch the subtle aspects of movement.
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.
The type of surgery depends on the type of problem. Outpatient procedures may be used to alter the growth of the limb. This is often done through small incisions. If an outpatient procedure is done, your child can continue with most regular activities. Other times, surgery may be very involved and require the use of an external device that is attached to the limb with pins and wires. This device may be left on for months to correct the deformity or lengthen the leg. If this type of surgery is required, your child will be making weekly visits to Cincinnati Children's.