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Coxa norma – Normal Femoral Neck Angle

Coxa norma describes the anatomically normal neck-shaft angle of the hip joint. In adults, this angle ranges between 120 and 135 degrees and serves as a reference value in orthopedics.

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Things worth knowing about "Coxa norma"

Coxa norma describes the anatomically normal neck-shaft angle of the hip joint. In adults, this angle ranges between 120 and 135 degrees and serves as a reference value in orthopedics.

What is Coxa norma?

Coxa norma refers to the anatomically normal condition of the hip joint, in which the centro-collum-diaphyseal angle (CCD angle) falls within the physiological normal range. This angle describes the inclination of the femoral neck relative to the longitudinal axis of the femur (thigh bone). In a healthy adult, this angle typically measures between 120 and 135 degrees. The term is used in orthopedics and radiology to distinguish the normal state from pathological deviations such as coxa valga (angle too steep) or coxa vara (angle too flat).

Anatomical Basics

The hip joint is a ball-and-socket joint formed by the femoral head (caput femoris) and the acetabulum of the pelvis. The femoral neck connects the femoral head to the shaft of the thigh bone. The geometry of this connecting structure is crucial for the biomechanics of the entire lower extremity.

CCD angle in newborns: approx. 150 degrees (more valgus)
CCD angle in adults (Coxa norma): 120–135 degrees
Coxa valga: CCD angle above 135 degrees
Coxa vara: CCD angle below 120 degrees

In addition to the CCD angle, the anteversion angle plays an important role. It describes the rotational offset of the femoral neck relative to the condylar axis of the femur. This angle also has physiological reference values that are considered within the concept of coxa norma.

Clinical Significance

Coxa norma primarily serves as a reference value that helps physicians correctly classify orthopedic findings. Deviations from the normal angle can lead to a range of complaints and conditions:

Coxa valga: An excessively steep femoral neck can predispose to hip dislocation, an altered gait, and early-onset arthritis.
Coxa vara: A flattened angle can cause groin pain, limping, and reduced walking ability.
Hip dysplasia: Often associated with altered CCD and acetabular angles.

Coxa norma therefore indicates a biomechanically well-aligned hip joint that is likely to remain functional under normal loading conditions over the long term, and which reduces the risk of degenerative conditions such as coxarthrosis (hip osteoarthritis).

Diagnosis

The CCD angle is typically determined using imaging procedures:

Pelvic X-ray: Standard method for angle measurement; an anterior-posterior (AP) standing view is the gold standard.
Computed tomography (CT): Used when the anteversion angle also needs to be precisely determined.
Magnetic resonance imaging (MRI): Used as a supplement to assess soft tissue structures surrounding the hip joint.

Measuring the CCD angle is an integral part of pediatric orthopedic screening and preoperative planning for hip surgery.

Treatment of Deviations from Coxa norma

Since coxa norma describes the normal state, no treatment is required for this finding. For confirmed deviations, treatment depends on the degree of malalignment and the symptoms present:

Conservative treatment: Physiotherapy, targeted strengthening exercises, and pain management for mild malalignments.
Surgical treatment: Corrective osteotomies (e.g., intertrochanteric osteotomy) can surgically restore the CCD angle to the normal range when conservative measures are insufficient.
Total hip replacement: In cases of advanced coxarthrosis resulting from axial malalignment, an artificial hip joint may become necessary.

References

Niethard, F. U., Pfeil, J., Biberthaler, P. (Eds.) – Duale Reihe Orthopädie und Unfallchirurgie, 8th edition, Thieme Verlag, Stuttgart 2017.
Debrunner, A. M. – Orthopaedics and Orthopaedic Surgery: Patient-Oriented Diagnostics and Therapy of the Musculoskeletal System, 4th edition, Huber Verlag, Bern 2005.
World Health Organization (WHO) – International Classification of Functioning, Disability and Health (ICF), Geneva 2001. Available at: https://www.who.int/classifications/icf/en/

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