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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.