Fairbank disease is a genetic condition that affects how cartilage and bone develop at the ends of long bones, particularly in the hips, knees, and ankles. Its formal medical name is multiple epiphyseal dysplasia (MED), and the “Fairbank” label refers specifically to the more severe form of the condition. It affects at least 1 in 10,000 newborns and is one of the more common skeletal dysplasias, a broad category of bone and cartilage disorders that collectively occur in about 1 in 5,000 births.
Most people with Fairbank disease experience joint pain and stiffness starting in childhood, and the condition increases the risk of early-onset arthritis. Life expectancy is normal, but joint health and mobility can decline over time without proper management.
How It Affects the Bones
The “epiphyseal” in multiple epiphyseal dysplasia refers to the epiphyses, the rounded ends of long bones where growth happens during childhood. In Fairbank disease, these growth centers don’t develop properly. They may appear smaller, irregular, or fragmented on X-rays. This means the smooth cartilage surfaces that cushion joints form abnormally, setting the stage for wear and pain.
The hips, knees, and ankles are most commonly involved, though shoulders, wrists, and hands can also be affected. In some cases, the bones of the hands and fingers are noticeably shorter, and overall adult height may be mildly reduced. However, many people with MED reach a normal or near-normal height, especially those with milder forms.
Fairbank Type vs. Ribbing Type
Doctors have historically described two forms of MED. The Fairbank type is the more severe version, associated with shorter stature and more widespread joint involvement. The Ribbing type is milder, often limited to the hips and with normal or near-normal height. In practice, the line between the two is blurry. Research comparing patients in short-stature and normal-stature groups found that some people with normal height still had significant bone changes in their wrists, while some shorter patients didn’t have the stubby fingers expected of the severe form. There are no clear-cut criteria to reliably separate the two types, so many specialists now treat MED as a spectrum rather than two distinct categories.
What Causes It
Fairbank disease is caused by mutations in genes that build the structural proteins of cartilage. The most commonly affected gene produces a protein called COMP, which helps organize the cartilage matrix. Other genes involved include those responsible for type IX collagen and a protein called matrilin-3, all of which contribute to cartilage strength and resilience.
What makes COMP mutations particularly damaging is a dual effect. When the COMP protein is made incorrectly, it often gets stuck inside the cartilage cells rather than being released into the surrounding tissue. This triggers a stress response inside the cell, causing inflammation, oxidative damage, and eventually cell death. Interestingly, mice that completely lack the COMP protein develop normal skeletons. The problem isn’t the absence of COMP but the presence of a defective version that poisons the cell from the inside. In some cases, the misfolded protein does get released and is incorporated into the cartilage matrix, weakening its structure from the outside as well.
The dominant form, which requires only one copy of the mutated gene from one parent, accounts for most diagnosed cases. A rarer recessive form also exists, requiring a mutated gene from both parents. Its true incidence is unknown.
Symptoms and When They Appear
Joint pain is typically the first sign, usually appearing between ages 2 and 5 when a child becomes more active. Parents may notice a waddling gait, reluctance to walk long distances, or complaints of hip or knee pain after physical activity. Some children are initially misdiagnosed with other conditions like juvenile arthritis or Legg-Calvé-Perthes disease because the symptoms overlap significantly.
Stiffness and reduced range of motion develop over time, particularly in the hips. Fatigue during physical activity is common. Because the condition progresses slowly, some milder cases aren’t identified until adolescence or even adulthood, when persistent joint pain finally prompts imaging studies that reveal the characteristic bone abnormalities.
How It’s Diagnosed
X-rays are the primary diagnostic tool. The hallmark findings are irregular, flattened, or fragmented epiphyses at multiple joints. A doctor looking at hip X-rays might see shallow hip sockets and misshapen femoral heads, while knee X-rays may show small, uneven growth plates. The fact that multiple joints are affected simultaneously helps distinguish MED from conditions that target a single joint.
Genetic testing can confirm the diagnosis and identify the specific mutation involved. This is especially useful for family planning, since the dominant form carries a 50% chance of being passed to each child. However, not every patient with clinical MED tests positive for a known mutation, so a normal genetic test doesn’t completely rule out the condition.
Managing Joint Pain and Function
There is no cure for Fairbank disease, so treatment focuses on protecting the joints, managing pain, and maintaining mobility. Physical therapy plays a central role. Strengthening the muscles around affected joints, particularly the core, hips, and thighs, helps stabilize them and reduce the load on damaged cartilage. Stretching exercises for the hamstrings and hip flexors improve flexibility and can ease stiffness. A home exercise program performed regularly, ideally most days of the week, is often more effective than occasional clinic visits alone.
Low-impact activities like swimming, cycling, and walking on flat surfaces allow children and adults to stay active without putting excessive stress on their joints. High-impact sports like running and jumping tend to accelerate cartilage wear. Over-the-counter pain relievers like acetaminophen can help during flare-ups. Heat therapy and other non-invasive treatments may provide additional relief with minimal side effects.
For children, activity modification is often the most important intervention. Teachers and coaches should know about the condition so they can adjust expectations during physical education. Letting a child rest when pain increases, rather than pushing through it, protects the joints during the years when bones are still developing.
Long-Term Outlook and Surgery
The biggest long-term concern is early-onset osteoarthritis. Because the joint surfaces develop abnormally, they wear down faster than normal. Many people with Fairbank disease develop significant arthritis in their hips and knees by their 30s or 40s, decades earlier than the general population. The severity varies widely. Some people manage well with conservative care throughout their lives, while others face progressive pain and stiffness that limits daily activities.
When arthritis becomes severe enough that pain and reduced mobility significantly affect quality of life, joint replacement surgery becomes an option. Hip replacement is the most common procedure for people with skeletal dysplasias, and it is not unusual for patients with severe forms to need it at a relatively young age. The surgery relieves pain and restores function, though replacement joints have a finite lifespan and may need to be revised after 15 to 20 years, which is an important consideration for younger patients.
Life expectancy with Fairbank disease is normal. The condition does not affect internal organs, the heart, or the brain. The challenges are primarily orthopedic, centered on maintaining joint health and adapting activity levels throughout life to preserve mobility for as long as possible.