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