Blounts disease (or Blount disease) is a growth disorder of the tibia (shin bone) which causes the lower leg to angle inward, resembling a bowleg. It is also known as "tibia vara". Description and risk factors
Blount disease is a growth disorder of the shin bone which causes the lower leg to angle inward, resembling a bowleg. It can present in boys under 4-years in both legs, or in adolescents usually on one side. Causes are thought to be genetic and environmental, like obesity, African-American lineage, and early walkers. Etymology
Blount disease is named after Walter Putnam Blount (1900–1992), an American pediatric orthopedic surgeon, who described it in 1937. It has also been known as Mau-Nilsonne Syndrome, after C. Mau and H. Nilsonne, who published early case reports of the condition. it is today considered an acquired disease of the proximal tibial metaphysis rather than an epiphyseal dysplasia or osteochondrosis. Diagnosis
Differential Diagnosis
Lower extremity deformities in Rickets can closely mimic those produced by Blounts disease. To differentiate between Rickets and Blounts disease it is important to correlate the clinical picture with laboratory findings such as calcium, phosphorus and alkaline phosphatase. Besides the X-ray appearance. Bone deformities in Rickets have a reasonable likelihood to correct over time, while this is not the case with Blounts disease. Nevertheless, both disorders may need surgical intervention in the form of bone osteotomy or more commonly guided growth surgery. Osteochondrodysplasias or genetic bone diseases can cause lower extremity deformities similar to Blounts disease.
Erythrocyanosis crurum is a skin condition, a variant  of acrocyanosis caused by chronic exposure to cold. See also
Chilblains
List of cutaneous conditions

References
Otto Braun-Falco; G. Plewig; H. H. Wolff; Walter H. C. Burgdorf (2000). Dermatology. Springer Verlag. p. 889. ISBN 3-540-59452-3. James, William D.; Berger, Timothy G.;  et al. (2006). Andrews Diseases of the Skin: Clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0. == External links ==