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Abstract Bowleg deformities are commonly observed in toddlers and most of them are physiologic bowing that recover spontaneously, but some demonstrate severe tibia vara deformities with internal torsion and progress to blount’s disease (Mukai et ai.,2000). Tibia vara or Blount’s disease, is a relatively rare disorder primarily involving the medial proximal tibial metaphysis, physis, and epiphysis. The disorder was originally described by Erlacher in 1922. Blount, in 1937, reported 15 cases from the literature coupled with 13 cases in his personal series (Turker and Drennan, 1997). His excellent description of the tibia vara has resulted in its being commonly called ”Blount’s disease”. (Griffin, 1986). Initially, Blount distinguished two clinical forms differentiated by age at presentation: 1- Infantile type, affects children between the age of I and 3 years, and 2- the less common adolescent type affects children older than 8 years of age (Warner et al., 1994). Thompson et al., (1984), later proposed a three-group classification, by adding a juvenile category because of the significant rate of recurrent deformity in their patients between 3 and 10 years of age and the absence of recurrence in patients who presented after 10 years of age. The three groups classification proposed are: 1- Infantile: one to three years. 2- Juvenile: four to ten years. 3- Adolescent: eleven years or older. Langenskiold, (1994), reported that since Blount, first described the condition in 1937, four types of tibia vara have been defined: 1- The infantile type (Blount’s disease), 2- The adolescent type caused by an epiphyseal-metaphyseal bone bridge after trauma or osteomyelitis, 3- The adolescent late onset type. 4- Tibia vara caused by focal fibrocartilaginous |