Unequal leg length

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
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Unequal leg length
Synonyms	Leg length discrepancy, limb length inequality
Pronounce	N/A
Specialty	N/A
Symptoms	Back pain, hip pain, knee pain, gait abnormalities
Complications	Scoliosis, osteoarthritis
Onset	Can be congenital or acquired
Duration	Chronic
Types	N/A
Causes	Congenital, trauma, infection, tumor, surgery
Risks	Athletic activity, growth spurts
Diagnosis	Physical examination, X-ray, CT scan, MRI
Differential diagnosis	Scoliosis, hip dysplasia, neuromuscular disorders
Prevention	Early detection and management of underlying conditions
Treatment	Orthotic devices, physical therapy, surgery
Medication	Pain management
Prognosis	Varies depending on severity and treatment
Frequency	Common
Deaths	N/A

Leg length measurement on X-ray

Custom shoes for leg length discrepancy

Standing on the Vertical Foot Alignment System (VFAS)

Unequal leg length, also known as leg length discrepancy (LLD), is a condition where the paired lower limbs have a noticeable difference in length. This condition can lead to various physical complications and may require medical intervention depending on the severity.

Causes

Leg length discrepancy can be classified into two main types: anatomical and functional.

• Anatomical LLD occurs when there is a true difference in the length of the bones. This can be due to congenital conditions, fractures, or diseases affecting bone growth such as osteomyelitis or bone cancer.
• Functional LLD is when the leg lengths are equal, but other factors such as muscle weakness, joint contractures, or pelvic obliquity cause an apparent discrepancy.

Diagnosis

Diagnosis of unequal leg length typically involves a physical examination and imaging techniques.

• Physical Examination: A healthcare provider may use a tape measure to assess the difference in leg lengths. The patient may be asked to stand or lie down during the measurement.
• Imaging: X-rays or CT scans can provide a more accurate measurement of the bone lengths. These images help in determining the exact difference and the underlying cause.

Treatment

Treatment for leg length discrepancy depends on the severity and the underlying cause. Options include:

• Non-surgical: For minor discrepancies, shoe lifts or custom orthotics can be used to balance the leg lengths. Physiotherapy may also be recommended to strengthen muscles and improve posture.
• Surgical: In cases of significant discrepancy, surgical options such as epiphysiodesis, limb lengthening, or shortening procedures may be considered.

Complications

If left untreated, unequal leg length can lead to complications such as:

• Gait abnormalities: Uneven leg lengths can cause limping or an abnormal walking pattern.
• Back pain: The imbalance can lead to scoliosis or chronic back pain due to compensatory mechanisms.
• Joint problems: Increased stress on the joints can lead to early onset of osteoarthritis.

Prevention

While congenital causes of leg length discrepancy cannot be prevented, early detection and treatment of conditions like fractures or infections can minimize the risk of developing LLD.

See also

• Scoliosis
• Osteoarthritis
• Physiotherapy