My Orthopaedic Surgeon

Coxa vara is a varus deformity of the femoral neck with a decrease in the angle between the neck and shaft of femur, which is normally between 135–145° in children. It may be con- genital, developmental in which symptoms appear during early childhood when walking is star ted or acquired secondar y to an underlying metabolic, neoplastic or traumatic cause.
Lam et al Emerg Med J 2001;18:314

DEVELOPMENTAL COXA VARA
* also known as cervical or infantile coxa vara * represents coxa vara not present at birth but rather developing in early childhood * coxa vara is defined as any decrease in the femoral neck-shaft angle less than 120 - 135 degrees

Coxa vara includes all forms of decrease of the femoral neck shaft angle to less than 120-135°. This condition has many etiologies: congenital, acquired, and developmental. Congenital coxa vara (CCV), also referred to as infantile or cervical coxa vara, is a condition in which a varus deformity exists that is assumed to be caused by either an embryonic limb bud abnormality or an intrauterine condition causing significant proximal femoral varus. CCV is, by definition, present at birth but manifests clinically during early childhood and commonly follows a clinical course that is progressive with growth.
Synonyms and related keywords: CCV, developmental coxa vara, infantile coxa vara, cervical coxa vara, childhood coxa vara, proximal femoral varus, proximal femoral focal deficiency, PFFD, congenital short femur, congenital bowed femur
Letts & Kontio 2007

Clinical features: deformity of the hip in which the angle between the neck and shaft of the femur is decreased [Inheritance: autosomal dominant] Illustrations and links

- decreased neck shaft angle from defect in ossification of femoral neck;
- it is bilateral in 1/3 to 1/2 of cases;
- it can be congenital (noted at birth & differenitated from CDH by MRI), developmental (AD-progressive), or acquired (trauma, LCP, SCFE)
Wheeless' Textbook of Orthopaedics

Definition Coxa vara, coxa adducta, coxa flexa, Alteration of the angle made by the axis of the femoral neck to the axis of the femoral shaft so that the angle is less than 135°; the neck becomes more horizontal.

Google search for Coxa Vara articles on JBJS B. Most of these are full text but may be quite old

Am. J. Roentgenol., Vol. 115, Issue 3, 561-568, July 1, 1972 JOSEPH D. CALHOUN and GUY PIERRET
Full text with line illustrations of classification system