VIDEO: Grace's Journey with Bilateral Fibular Hemimelia * 2023
VIDEO: Grace's Journey with Bilateral Fibular Hemimelia * 2023

Fibular hemimelia or longitudinal fibular deficiency

Children who have fibular hemimelia are born with a short or missing fibula (one of the two bones in the lower leg). Other bones in the leg, ankle, and foot can be affected too. Most children with Fibular hemimelia have it in one leg, but some have it in both. Experts who treat bone problems have several options to help kids with a hemimelia.

Fibular hemimelia is so rare. It can be scary for new parents who aren’t sure what is wrong with their child, especially when their doctors haven’t seen a case of Fibular hemimelia. “The congenital absence of the fibula, and it is the most common congenital absence of long bone of the extremities.” It is the shortening of the fibula at birth, or the complete lack thereof. Fibular hemimelia often causes severe knee instability due to deficiencies of the ligaments. Severe forms of fibula hemimelia can result in a malformed ankle with limited motion and stability. Fusion or absence of two or more toes are also common. In humans, the disorder can be noted by ultrasound in utero to prepare for amputation after birth or complex bone lengthening surgery.

The amputation usually takes place at six months, with removal of portions of the legs to prepare them for prosthetic use. The other treatments, which include repeated corrective osteotomies and leg-lengthening surgery (Ilizarov apparatus), are costly and associated with residual deformity.

Causes Fibular hemimelia

Scientists and doctors don’t know exactly why babies are born with fibular hemimelia. But they do know that nothing a mom does during pregnancy causes the problem. Parents can’t stop it from happening, but they can help kids get the best care.


Signs and symptoms of Fibular hemimelia

Some things that parents might see when a baby is born with hemimelia.

  • When all or some of the bone is missing in one leg, the leg is shorter than the other. Doctors call this a leg length discrepancy.
  • Because the shinbone is short or missing, the ankle joint may not form as it should. The ankle and foot might look different from normal.
  • The child’s knee and lower leg might bend inward.
  • The child’s lower leg may bow out.
  • The foot may not have all five toes.

A baby with hemimelia can have problems that parents won’t see. Doctors can find these through physical exams and tests:

  • The hip joint may be too shallow.
  • Some of the ligaments (strong, flexible bands of tissue) that hold the knee together may be weak or missing.

Treatment for severe Fibular hemimelia

Treatment depends on how the child is affected. Some children with fibular hemimelia have very mild limb length difference and need very little treatment. Others have a large limb length difference and unstable joints.

When a child has fibular hemimelia, the leg may not grow as fast or as long as it should. Kids might have trouble standing or walking. Getting the right treatment is important.

Different experts work as a team to treat fibular hemimelia. The team is led by orthopedic specialists (doctors and other health care providers who treat bone and muscle problems). They work with other specialists as needed. Your child’s team also might include physical therapists and an orthotist.

The care team will come up with a plan to help your child stand, walk, and play like other kids. The plan is based on:

  • how much bone is missing
  • how much difference there is in the length of the legs
  • how the problem might affect your child as he or she grows
  • whether your child has foot or ankle problems

You might need to bring your child for a series of visits over several months before the care team decides on treatment. This gives the team time to understand how your child will grow and what the difference in leg length might be.

When there isn’t a lot of difference in leg length, a child might wear a special shoe or shoe insert. But most kids need surgery.

Surgeries can treat Fibular hemimelia

Doctors do different surgeries depending on a child’s situation. Most kids get surgery to help their legs grow to the same length. Others need surgery to stand and walk. Some kids only need one surgery. Others have several surgeries during their growing years.


When kids have small differences in leg length, the care team might suggest a surgery called epiphysiodesis. For this surgery to work, kids must still be growing.

During the surgery, one or two of the growth plates in the longer leg are scraped or compressed with surgical plate and screws. A growth plate is an area at the end of the bone where new growth happens. The surgery slows or stops the longer leg from growing, so the shorter leg can catch up.

Leg-Lengthening Surgery

Kids who get leg-lengthening surgery usually need a few operations over several years. The surgery can add about 8 inches (20 centimeters) to the shorter leg.

In this surgery, the orthopedic team places a lengthening device on the shorter leg. The device might be on the outside of the body or inside the bone.

Other Surgeries

Besides, surgery to fix leg length differences, some kids need surgery to help them stand and walk. These surgeries repair bones, muscles, and joints that didn’t form correctly because of the hemimelia.

Sometimes orthopedic experts know that surgery won’t help a child to stand or walk properly. A child might have one leg that is a lot shorter than the other, or a foot problem that can’t be fixed. For these kids, a prosthesis offers the best chance to live an active life.

Doctors might amputate (do surgery to remove) part of the foot or leg, so the child can wear a prosthesis. Orthotists then fit the child with a prosthetic lower leg.

New prosthetics let kids who have had an amputation run, climb, and jump like other kids. Most kids can play sports.

Kids who wear prosthetic legs need to see an orthotist at least once a year. The orthotist will adjust the prosthesis or make a new one as the child grows.

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