Coxa valga

Coxa valga describes a deformity of the hip where there is an increased angle between the femoral neck and femoral shaft.

Pathology

Coxa valga is often associated with shallow acetabular angles and femoral head subluxation.

Etiology

• bilateral
  • neuromuscular disorders, e.g. cerebral palsy
    • often have concurrent femoral anteversion
  • skeletal dysplasias, e.g. Turner syndrome, mucopolysaccharidoses
• unilateral
  • trauma causing growth plate arrest

Radiographic features

Plain radiograph

Coxa valga occurs when the angle formed between the neck of the femur and its shaft (also known as the caput-collum-diaphyseal (CCD) angle or the femoral angle of inclination) is increased beyond >140º. Normal is between 125-135º in adults, but can be 20-25º greater at birth and 10º greater in children. When the angle is <120º, this is considered coxa vara.

Femoral anteversion and rotation can affect measurement accuracy and should be considered when measuring angles.

Treatment and prognosis

Coxa valga can be associated with genu varum and lead to increased stress and early degenerative changes in the medial compartment of the knee.

Coxa valga can be treated with varus derotation osteotomy (VDRO) and angled blade-plate fixation .

See also

• coxa vara
• femoral head-neck-shaft angle

Siehe auch:

• Coxa vara
• CCD-Winkel

und weiter:

• Akrorenales Syndrom
• CCD angle
• Valgusstellung
• Prader-Willi-Syndrom
• Poliomyelitis
• Mukopolysaccharidose Typ IV
• Varianten der Beckenanatomie