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Medical Definition of Coxa valga
1. Alteration of the angle made by the axis of the femoral neck to the axis of the femoral shaft, so that the angle exceeds 135°; the femoral neck is in more of a straight-line relationship to the shaft of the femur. Coxa vara, 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 femoral neck becomes more horizontal. Synonym: coxa adducta. Coxa vara luxans, coxa vara with dislocation of the femoral head. (05 Mar 2000)