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Table 2 Diagnosis at time of arthroscopy

From: Evaluation of arthroscopy and macroscopic scoring

Diagnosis

All patients (n)

RF+

(n)

Patients with early disease (<12 months) (n)

RF+

(n)

Rheumatoid arthritis

160

129

52

39

Undifferentiated monoarhtritis

13

4/11a

8b

2/6a

Undifferentiated oligoarthritis

9

2

4b

1

Undifferentiated polyarthritis

7

2

5c

1

Juvenile idiopathic arthritis

9

4

0

0

Adult Still's disease

1

0

0

0

Undifferentiated spondylarthritis

4

0

2

0

Psoriatic arthritis

12

0

2

0

Ankylosing spondylitis

1

0

0

0

Ulcerative colitis

2

0/1d

1

0

Undifferentiated systemic inflammatory disease with arthritis

1

0

0

0

Systemic lupus erythematosus

3

0

1

0

Cutaneous PAN with arthritis

1

0

0

0

Osteoarthritis

4

4

1

1

Healthy individuals

10

ND

NA

NA

Sum

237

141

76

42

  1. All patients had clinically active inflammation or pain in at least the investigated joint (exceptions: healthy individuals). a Two patients were not tested for RF. b One RF+ patient later fulfilled RA classification criteria. c One RF-patient later fulfilled RA classification criteria, one RF-patient was later diagnosed positive for human parvovirus type B19 infection and one RF+ patient was later diagnosed with dermatomyositis. d One patient was not tested for RF.
  2. NA = not applicable; ND = not determined; PAN = polyarteritis nodosa; RF = rheumatoid factor.