Frontal plane angular deformities of the lower limbs are related with the mechanical axis deviation which represents the trajectory of the body weight. Femur, tibia or both could be affected with or without compensation. The deformities could be positioned at the the diaphyseal area or juxta-articular region as a malorientation of the joint. Patients are mostly suffered with gait abnormalities and pain. Cosmetic and psychologic concerns along with the functional limitations are also challenging. The first step of the treatment is to define the deformity a systematic and quantitative aspect and determine the effects of these measurements to the symptomatology and daily life. At the end, these definitions and calculations will be used in the treatment choice. In this article, analysis and treatment options of the femur uniapical deformities will be discussed by the manner of the commonly accepted worldwide principles.