<prompt> A 68-yr-old man came with pain and swelling of the right knee. Ahlback grade 2 osteoarthritic changes were found on investigation. What is the further management?Arthroscopic washoutHigh tibial osteotomy.Total knee replacementConservative  <response>: Type I to Type III are treated by conservative treatment which includes :Non-pharmacological therapy: Lifestyle modification, Physiotherapy exercise, Bracing arthrosisPharmacological therapy: NSAIDS, intraarticular injection of steroid or hyaluronic acid.If conservative treatments fail, surgery is indicated and surgical options are:-i Arthroscopic washout or debridementii Realignment osteotomy: Proximal High tibial osteotomy, Distal femoral Supracondylar osteotomyiii Unicompartmental arthroplastyiv Total knee arthroplasty Total knee replacementType IV and Type V are treated with surgery.Total knee replacement TKR is the surgery of choice. 