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Table 2 Number of grade 0–IV lesions from baseline to follow-up in the progression and the non-progression groups

From: Prediction of progression of damage to articular cartilage 2 years after anterior cruciate ligament reconstruction: use of aggrecan and type II collagen biomarkers in a retrospective observational study

Progression group Non-progression group
Baseline    Follow-up Baseline    Follow-up
Grade 0–II Grade III–IV Grade 0–II Grade III–IV
Grade 0 28.9% (n = 26) 22 (84.6%) 4 (15.4%) Grade 0 28.7% (n = 81) 81 (100%) 0 (0%)
Grade I 33.3% (n = 30) 24 (80.0%) 6 (20.0%) Grade I 44.3% (n = 125) 122 (97.6%) 3 (2.4%)
Grade II 26.7% (n = 24) 14 (58.3%) 10 (41.7%) Grade II 17.7% (n = 50) 49 (98.0%) 1 (2.0%)
Grade III–IV 11.1% (n = 10) 0 (0%) 10 (100%) Grade III–IV 9.2% (n = 26) 11 (42.3%) 15 (57.7%)
  1. N = 15 (progression group), N = 47 (non-progression group). Total compartments that were investigated arthroscopically for the Outerbridge grading = 6 per knee (total of 90 (6 × 15) compartments for the progression group and 282 (6 × 47) compartments for the non-progression group). Baseline, ACL construction; Follow-up, implant removal; Progression group, patients with an increase (between baseline and follow-up) in the number of high-grade cartilage lesions (Outerbridge grades III and IV) by one score in any of the six compartments; Non-progression group, patients with no increase in the number of high-grade cartilage lesions