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Table 1 Illustrates the inclusion and exclusion criteria. In Norway, the retirement age is 67 years and we included patients up to this age

From: Development of a pilot cartilage surgery register

Inclusion criteria
 - Diagnosed focal cartilage defect (ICRS grade 3-4) during arthroscopy or open surgery
 - Operations/reoperations in patients with a known FCD
 - Age <67 years
Exclusion criteria
 - Generalized knee OA
 - Other systemic diseases with a known increased risk of knee OA, such as rheumatoid arthritis