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CE Angle – Definition, Normal Values & Clinical Relevance

The CE angle (center-edge angle) is a radiological measurement used to assess hip joint stability and the coverage of the femoral head by the acetabular roof.

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Things worth knowing about "CE Angle"

The CE angle (center-edge angle) is a radiological measurement used to assess hip joint stability and the coverage of the femoral head by the acetabular roof.

What Is the CE Angle?

The CE angle, also known as the center-edge angle or Wiberg angle, is an important radiological measurement used to evaluate the hip joint. It was first described in 1953 by Swiss orthopedic surgeon Georg Wiberg. The CE angle quantifies how well the acetabular roof (hip socket) covers the femoral head (the ball of the hip joint), making it a key indicator of hip joint stability and congruence.

How Is the CE Angle Measured?

The CE angle is measured on a standard anteroposterior (AP) pelvic X-ray. Two lines are drawn to determine the angle:

A vertical line drawn perpendicular through the center of the femoral head.
A second line drawn from the center of the femoral head to the lateral (outer) edge of the acetabular roof.

The angle formed between these two lines is the CE angle. A larger angle indicates greater bony coverage of the femoral head.

Normal Values and Clinical Interpretation

Normal values for the CE angle vary depending on the age of the patient:

Adults: The normal range is 25° to 40°. Values above 40° may indicate over-coverage of the femoral head (pincer-type impingement).
Children and adolescents: Lower threshold values apply, as the hip joint is still developing.
Dysplasia range: A CE angle below 20° is considered a sign of hip dysplasia, meaning the femoral head is insufficiently covered.
Borderline range: Values between 20° and 25° are considered borderline and require further clinical assessment.

Clinical Significance

The CE angle plays a central role in diagnosing and planning treatment for various hip conditions:

Hip Dysplasia

In hip dysplasia, the acetabular roof is underdeveloped, providing insufficient coverage of the femoral head. This increases stress on the articular cartilage and can lead to hip osteoarthritis (coxarthrosis) over time. A reduced CE angle is a key diagnostic criterion for hip dysplasia.

Femoroacetabular Impingement (FAI)

In femoroacetabular impingement (FAI), there is a mechanical conflict between the femoral head and the acetabulum. An elevated CE angle may indicate pincer-type impingement, in which excessive coverage leads to painful impingement of soft tissue structures.

Surgical Planning

The CE angle is used in the planning and postoperative evaluation of procedures such as periacetabular osteotomy (PAO) or hip arthroscopy. The angle is remeasured after surgery to assess the outcome of treatment.

Diagnosis and Imaging

In most cases, a standard AP pelvic X-ray is sufficient to determine the CE angle. In cases of diagnostic uncertainty or for detailed surgical planning, additional MRI (magnetic resonance imaging) or CT scanning of the hip joint may be performed to evaluate soft tissues, cartilage, and bony structures in greater detail.

Summary

The CE angle is a straightforward and clinically valuable measurement for assessing femoral head coverage. It is essential in the diagnosis of hip dysplasia and femoroacetabular impingement, as well as in pre- and postoperative planning. Normal values in adults range from 25° to 40°; deviations in either direction may indicate conditions requiring medical attention.

References

Wiberg G. - Studies on dysplastic acetabula and congenital subluxation of the hip joint. Acta Chirurgica Scandinavica, 1953.
Tönnis D. - Normal and Pathological Development of the Hip. Springer Verlag, 1984.
Ganz R. et al. - Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clinical Orthopaedics and Related Research, 2003.

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