Overview
Limb-length discrepancies or differences are conditions that result in limbs that are unequal in length or that exhibit other anomalies. The conditions occur when bones or joints in the arms or legs are abnormal or become damaged. Providers might refer to these conditions as limb-length discrepancies, limb differences or limb-length conditions.
Causes
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.
Symptoms
The effects of a short leg depend upon the individual and the extent of discrepancy. The most common manifestation if a lateral deviation of the lumbar spine toward the short side with compensatory curves up the spine that can extend into the neck and even impacts the TMJ. Studies have shown that anterior and posterior curve abnormalities also can result.
Diagnosis
The only way to decipher between anatomical and functional leg length inequalities (you can have both) is by a physical measurement and series of biomechanical tests. It is actually a simple process and gets to the true cause of some runner?s chronic foot, knee, hip and back pain. After the muscles are tested and the legs are measured it may be necessary to get a special X-ray that measures both of your thighs (Femurs) and legs (Tibias). The X-ray is read by a medical radiologist who provides a report of the actual difference down to the micrometer leaving zero room for error. Once the difference in leg length is known, the solution becomes clear.
Non Surgical Treatment
Treatment depends on the amount and cause of the leg length discrepancy as well as the age of your child. Typically, if the difference is less than 2 cm we don?t recommend immediate treatment. We may recommend that your child wear a heel lift in one shoe to make walking and running more comfortable. If the leg length discrepancy is more significant, your doctor may recommend surgery to shorten or lengthen a leg. The procedure used most often to shorten a leg is called epiphysiodesis.
how do you grow?
Surgical Treatment
Differences of an inch-and-a-half to two inches may require epiphysiodesis (adjusting the growth of the longer side) or acute shortening of the other side. Differences greater than 2.5 inches usually require a lengthening procedure. The short bone is cut and an external device is applied. Gradual lengthening is done over months to allow the muscles and nerves accommodate the new length.
Limb-length discrepancies or differences are conditions that result in limbs that are unequal in length or that exhibit other anomalies. The conditions occur when bones or joints in the arms or legs are abnormal or become damaged. Providers might refer to these conditions as limb-length discrepancies, limb differences or limb-length conditions.
Causes
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.
Symptoms
The effects of a short leg depend upon the individual and the extent of discrepancy. The most common manifestation if a lateral deviation of the lumbar spine toward the short side with compensatory curves up the spine that can extend into the neck and even impacts the TMJ. Studies have shown that anterior and posterior curve abnormalities also can result.
Diagnosis
The only way to decipher between anatomical and functional leg length inequalities (you can have both) is by a physical measurement and series of biomechanical tests. It is actually a simple process and gets to the true cause of some runner?s chronic foot, knee, hip and back pain. After the muscles are tested and the legs are measured it may be necessary to get a special X-ray that measures both of your thighs (Femurs) and legs (Tibias). The X-ray is read by a medical radiologist who provides a report of the actual difference down to the micrometer leaving zero room for error. Once the difference in leg length is known, the solution becomes clear.
Non Surgical Treatment
Treatment depends on the amount and cause of the leg length discrepancy as well as the age of your child. Typically, if the difference is less than 2 cm we don?t recommend immediate treatment. We may recommend that your child wear a heel lift in one shoe to make walking and running more comfortable. If the leg length discrepancy is more significant, your doctor may recommend surgery to shorten or lengthen a leg. The procedure used most often to shorten a leg is called epiphysiodesis.
how do you grow?
Surgical Treatment
Differences of an inch-and-a-half to two inches may require epiphysiodesis (adjusting the growth of the longer side) or acute shortening of the other side. Differences greater than 2.5 inches usually require a lengthening procedure. The short bone is cut and an external device is applied. Gradual lengthening is done over months to allow the muscles and nerves accommodate the new length.