Summary
Blount disease is characterized by disturbed growth of the inner portion of the upper tibial extremity, progressively leading to bowlegged deformity with bone angulation just below the knee (tibia varus). In 60% of cases, the condition affects both legs. Prevalence is unknown. Clinically, patients with Blount disease present with bowing and length discrepancy in the lower limbs and a medial prominence of the proximal tibia. Obesity and early walking are predisposing factors for the development of the disorder. The underlying causes are controversial: it seems to be a multifactorial disease, but the contribution of genetic factors is unknown. Blount disease can only be diagnosed in children over 2 years of age, as tibia varus can occur physiologically. A severe untreated deformity can lead to early degenerative arthritis of the knee. Management must be adapted to each child: an orthopaedic therapeutic program is often the first management option, but in more severe cases associated with pain, surgery may be indicated to correct the deformity. *Orphanet (October 2006)*.
