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In children, leg length discrepancy is often first noticed by parents. To properly diagnose this condition in children, a paediatric orthopaedist will:
The difference in limb length can be measured in different ways, such as:
For a more precise measurement of the difference in limb length, imaging tests may be recommended. This helps your doctor identify the cause or origin of the problem, so that appropriate treatment can be prescribed.
These may include one or more of the following:
Treatment for leg length discrepancy will depend on its cause, severity and the child’s age. In most cases, minor differences in leg length can be corrected by wearing a lift or insert in one shoe.
Significant differences in leg length may require surgery to prevent further complications. Surgical treatment may include:
This procedure may be recommended for children who are still growing, to slow or stop the rate of growth in the longer leg. This allows the shorter limb to catch up in length.
The procedure is performed through small incisions around the knee. It is timed such that the leg lengths are equal by the time the child’s growth ends in their mid-to-late teens.
This is an option in patients who have smaller leg length discrepancies.
In this procedure, a segment of bone from the middle of the longer limb is removed. A metal plate or rod is inserted to hold the bones in place while it heals.
This procedure is usually performed only for patients with significant discrepancies.
It may be performed externally or internally. Both types require regular follow-up visits to the doctor to monitor treatment progress, followed by extensive rehabilitation that includes physiotherapy.
External lengthening involves cutting the bone in the shorter leg and inserting a frame, also known as an external circular-ring fixator, that is connected to the bone with pins or wires.
The frame is manually turned to gradually pull the bones apart, allowing new bone to grow.
The frame is worn until the newly-grown bone is strong enough to support the patient. During this time, careful maintenance and cleaning of the pins are important to prevent infection.
Similarly, internal lengthening involves cutting the bone in the shorter leg.
An expandable metal rod is surgically implanted and gradually lengthened, pulling the bones apart and allowing new bone to grow in its place.
The process may take months, but the advantage is that it has less potential for wound complications.
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