26th January 2024

Definitions 

OA can be classified as either primary or secondary:

• Primary (idiopathic): no history of preceding joint injury
  • Localised: affecting hands, knee, hip or foot
  • Generalised: affecting hands and another joint
• Secondary: occurs following a pre-existing insult to the joint, e.g. congenital abnormality, trauma, inflammatory arthropathies, repetitive physical or occupational strain.