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10 9 8 7 6 5 4 3 2 1 In contrast secondary OA is due to a known predisposing factor which might include any of those listed above or one of the following: Previous trauma; Mechanical incongruity of the joint due to a congenital malalignment or previous trauma to the joint surface; Previous inflammatory joint disease, septic arthritis or bone disease, Paget disease; Neuropathic joint disease; Previous repeated steroid injections; Endocrinopathies , Cushing’s disease, haemochromatosis.  Blood dyscrasias, haemophilia with recurrent hemarthrosis;