KSS Knee distribution for 'classic’ and 'complete’ TKR. The Y-axis represents the percentage of TKRs of the 'complete’ and 'classic’ cohort. A higher percentage of patients in the 'complete’ cohort is found in the lowest quartile. More specific, 13% of the 'complete’ TKRs score between 37.5 and 50 points compared with 3% of the 'classic’ TKRs. Q1, lowest quartile; Q2, second quartile; Q3, third quartile; Q4, highest quartile.