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Table 1 Characteristics of the study patients and reference group

From: Synovial fluid level of aggrecan ARGS fragments is a more sensitive marker of joint disease than glycosaminoglycan or aggrecan levels: a cross-sectional study

      OA score
Study group Subject number Male, % Age, years Time of sampling, weeks after injury or onset   no.
REF 26 62 27 (17 to 89) - 1 (1 to 1) 16
AA 48 60 66 (30 to 92) 0.4 (0 to 510) 7 (3 to 9) 31
AI 69 81 27 (16 to 59) 1.4 (0 to 11.9) 1 (1 to 5) 67
CI 123 77 40 (16 to 70) 61 (12.7 to 1926) 2 (1 to 8) 121
OA 29 66 61 (25 to 92) 125 (0 to 772) 7 (2 to 9) 29
  1. Age, time of sampling and OA score in median values (range).
  2. REF = healthy knee reference; AA = acute inflammatory arthritis (46 acute pyrophosphate arthritis/pseudogout, one rheumatoid arthritis and one acute reactive arthritis/Yersinia); AI = acute knee injury (47 anterior cruciate ligament ruptures and one posterior, with or without meniscus tear and meniscus tear alone, 0 to 12 weeks after injury); CI = chronic knee injury (120 anterior cruciate ligament ruptures and three posterior, with or without meniscus tear and meniscus tear alone, > 12 weeks after injury); OA = knee osteoarthritis. The OA score ranges from 1 to 10 where 1 represents a normal joint; see Materials and Methods for a detailed description.