<prompt> Herberdens ahropathy affects:Lumbar spineSacroiliac jointDistal interphalangeal jointKnee joint  <response>: Osteoahritis of DIP is known as Heberdens nodes. Osteoahritis of PIP is known as Bouchards nodes Sacroiliac joint is affected in ankylosing spondylitis Knee joint is usually affected in osteoahritis Pseudogout 