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Table 1 Causes of secondary OA

From: Obesity, knee osteoarthritis and knee arthroplasty: a review

Trauma
Infection
Deformity Secondary to developmental hip dysplasia or Perthes’ disease.
Avascular necrosis
Other medical causes Renal disease, Sickle cell disease, Haemophilia, Wilsons, Haemochromatosis, Endocrine
Skeletal dysplasia