Table 1.

MRI, radiographic assessment and collection of biological samples over the study period for patients recruited at the Linköping site

	Baseline	3 months	6 months	12 months	24 months	60 months
Weight-bearing radiographs	X	–	–	–	–	X
Full clinical protocol	X*	–	–	–		–
Compositional protocol	X	X	X	X	–	–
Explorative protocol	X	X	X	X	X	X
Blood	X	X	X	X	X	X
Urine	X	X	X	X	X	X
Joint fluid†	X

*Bilateral assessment.

†Collection will be performed under anaesthesia at the time of any surgery during follow-up.