Table 1

Characteristics of the study patients and reference group

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

Age, time of sampling and OA score in median values (range).

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.

Larsson et al. Arthritis Research & Therapy 2009 11:R92   doi:10.1186/ar2735