A separation of the ball of the hip joint from the thigh bone (femur) at the upper growing end of the bone.

Alternative Names

Femoral epiphysis - slipped; Slip; Scfe

Causes, incidence, and risk factors

The epiphysis is at the ends of long bones . It is separated from the main part of the bone by the epiphyseal plate (growth plate). In this condition, a displacement occurs in the upper epiphysis while the bone is still growing. It is more common in boys, in children who are obese , and in children who grow rapidly. It occurs most often between the ages of 11 and 15.

Signs and tests

Physical examination shows decreased hip motion and pain with attempted movement of the hip. A hip X-ray or pelvis X-ray shows displacement.

Treatment

Surgery to stabilize the bone with pins or screws prevents further displacement of the ball of the hip joint (i.e., prevents further "slippage").

Expectations (prognosis)

The outcome is expected to be good with treatment.

Complications

This disorder is associated with an increased incidence of osteoarthritis later in life. Other potential but rare complications include diminished blood flow to the hip joint and thinning of the cartilage in the hip joint.

Calling your health care provider

If your child experiences persistent pain or other symptoms of this disorder, have the child lie down immediately and do not let them walk until they have been examined by the health care provider.

Prevention

Weight control for obese children may be helpful. Many cases are not preventable.