Coxa valga describes an anatomical feature of the hip joint where the angle between the femoral neck and the femoral shaft is larger than usual. Normally, this angle is around 120 to 135 degrees. In coxa valga, it is typically more than 140 degrees.
What exactly happens in coxa valga?
In the hip joint, the pelvis and the thigh bone meet. The femoral neck connects the ball-shaped head of the thigh bone to the long femoral shaft. The angle between these two sections of bone is important for the stability and movement of the hip joint. In coxa valga, this angle is increased, meaning the femoral neck sits more upright than usual. This changes the alignment of the leg and the way load is distributed across the hip joint.
This change can affect one or both hips and is either present from birth or develops during growth. In some cases, coxa valga can also develop as a result of other conditions, such as certain neuromuscular disorders or after hip injuries in childhood.
Possible effects on everyday life
Coxa valga does not always cause symptoms. Many people with this anatomical variation notice nothing at all and have no restriction in movement. Sometimes the change is only picked up on an X-ray taken for a different reason.
In some cases, however, coxa valga can make the hip joint less stable. There is a slightly increased risk of something called hip dysplasia, where the head of the thigh bone does not sit properly in the hip socket. Increased pressure on certain areas of the joint is also possible, which over time can encourage the development of arthritis. In children and young people, coxa valga may show up as an unusual walking pattern, knock knees, or a slight difference in leg length.
Is coxa valga dangerous?
A diagnosis of coxa valga can feel worrying, especially when it appears in a doctor's letter or medical report. People often wonder whether this change needs to be treated or whether it will cause long-term problems.
In the vast majority of cases, coxa valga is not an immediate danger. As long as there are no symptoms and movement is not restricted, no action is usually needed. Doctors monitor how things develop at regular intervals, particularly in children who are still growing. A closer look is only taken when pain, changes in walking, or other concerns arise.
How is coxa valga diagnosed?
Coxa valga is most reliably identified on an X-ray. The doctor measures what is known as the CCD angle, which is the angle between the shaft and neck of the thigh bone. If this angle is above 140 degrees, the diagnosis of coxa valga is made.
In children, an ultrasound scan of the hip joint may also be useful. In rare cases, further imaging methods are used, for example when a detailed assessment of the hip socket or the surrounding soft tissue is needed.
Treatment options when symptoms are present
Whether treatment is necessary depends mainly on whether symptoms are present and how pronounced the anatomical change is. In children, the angle can sometimes correct itself during growth, so a wait-and-see approach is often taken at first.
If pain occurs or there are recurring problems with walking, targeted physiotherapy exercises can help to strengthen the muscles around the hip joint and improve stability. Only in rare cases, such as when there is a significant misalignment or a clear loss of function, is surgical correction considered. In this procedure, the angle between the femoral neck and shaft is adjusted surgically.
What does the diagnosis mean for the future?
In most cases, a diagnosis of coxa valga is not a cause for concern. Many people live with it completely free of symptoms. It is important to watch for any changes: if pain develops when walking, the walking pattern becomes unusual, or movement feels restricted, this should be checked by a doctor.
Regular check-ups, especially during periods of growth, help to identify any problems early. With targeted exercise and good muscular support of the hip joint, the risk of further problems can usually be reduced significantly. Adjustments to daily life or special rest are generally not needed as long as there are no symptoms.
