Herberden's ahropathy affects:
Lumbar spine
Sacroiliac joint
Distal interphalangeal joint
Knee joint
Osteoahritis of DIP is known as Heberden's nodes. Osteoahritis of PIP is known as Bouchard's nodes Sacroiliac joint is affected in ankylosing spondylitis Knee joint is usually affected in osteoahritis &Pseudogout
FMGE 2017