Andersson Lesion Presenting Itself as Spondylodiscitis and Evolving to Pseudoarthrosis in a Patient with Ankylosing Spondylitis: A Case Report

This is a case report of a patient with an advanced stage Andesson lesion presenting itself as a spondylodiscitis which evolved to a full pseudoarthrosis. A 57-year-old Caucasian woman with a known history of ankylosing spondylitis was admitted due to worsening pain in her back and lower limbs that did not respond to conservative treatment. A series of surgical procedures were needed. Although ankylosing spondylitis is a well-known disease, Andersson lesions are not well known nor fully understood. Orthopaedic surgeons must be familiar with the condition in order to make the right diagnosis.