Excessive Friction in Your Hip Joint Can Cause Femoral Acetabular Impingement (FAI)

Hip pain is a fairly common complaint among both men and women, and especially among people who are very physically active. Several factors can cause or contribute to hip pain, but one of the most common causes is a condition called femoral acetabular impingement or FAI.

Hip joint anatomy

Your hip is a ball-and-socket joint comprising two main bones: your femur or thigh bone and your pelvic bone, or more specifically, a concave area of the pelvic bone called the acetabulum. The acetabulum is shaped kind of like a cup. It forms the socket portion of the joint, cradling or cupping the rounded, ball-shaped head of the femur (also called the femoral head).

Both the femoral head and the acetabulum are lined with a thick layer of cartilage, which prevents friction between the joint components and helps the joint move smoothly. Sometimes, though, the cartilage can be damaged, or the hip joint may not “fit together” the way it’s supposed to. In both these cases, friction inside the joint increases. Arthritis is one cause of hip joint friction, but it can also be caused by FAI.

Three types of FAI

FAI can be categorized into three broad “types,” depending on whether the femur or acetabulum is causing problems.

Some people who have FAI have defects in the shape of the joint. These defects can be present from birth or develop as the bones form, or they may be caused by traumatic injury.

Damage to joint components

Left untreated, FAI can cause substantial damage to the hip joint components. As the ball and socket portions rub against each other, friction inside the joint increases, which in turn leads to irritation and inflammation inside the joint. Over time, the protective layer of cartilage will become worn in areas where friction is greatest, resulting in pain, stiffness, and general joint dysfunction. Many people with advanced FAI find themselves limping or changing the way they walk in order to take pressure off the sore hip. Instead of relieving friction and pain inside the affected joint, changes in the way you walk can wind up placing excess strain on your other hip, which means it may be at an increased risk for damage.

Because of the uneven wear and increased friction inside the joint, people who have FAI and don't have it treated are at an increased risk for developing severe arthritis in the hip. Over time, untreated FAI can increase the likelihood you'll need a hip joint replacement, or it can mean you'll need a hip replacement earlier than you otherwise would.

Symptoms and treatment

Although FAI is more common among very active athletes and people who participate in high-impact activities, anyone can develop the condition. The most common symptoms of FAI include:

Treatment begins with conservative options like rest from strenuous activity combined with physical therapy to restore function and reduce stiffness and pain in the joint. Over-the-counter pain medicines can help with some symptoms, and injections of corticosteroids also can be very beneficial for more moderate to severe symptoms.

When conservative techniques aren’t effective in providing symptom relief, Dr. Coleman may recommend a minimally invasive procedure called a hip arthroplasty to repair the joint surfaces, remove bony growths, or perform other procedures to help restore normal joint function.

Learn what's causing your hip pain

Because different conditions can cause painful hip symptoms, the only way to know if you have FAI or another underlying problem is to have your hip pain evaluated. As a leading orthopedic surgeon, Dr. Struan Coleman is skilled in diagnosing the cause of hip pain so patients can receive the most appropriate and most effective care for their needs. Take the next step toward resolving your hip pain and stiffness. Contact the practice and schedule your consultation and evaluation today.

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