You've probably all heard someone complain of having dodgy knees whether they be an athlete who has suffered an injury or an older family member, resigned to the bodily wear and tear that comes with age.
But how much do you actually know about how your knees work and what you can do to look after them better to stay as mobile as possible moving forward?
Dr Simon Young is an Orthopaedic Surgeon specialising in knee surgery and an Associate Professor at Auckland University, internationally recognised in his field of research.
He talks all things knee related with Kathryn and takes questions from listeners.