Table 1 Final diagnoses in 296 consecutive outpatients presenting with isolated knee monoarthritis observed over a 6‐year period.

Diagnosis	No.	Percentage
Osteoarthritis and knee degenerative disorders	164	55.4
Psoriatic arthritis	49	16.5
Spondyloarthritis	34	11.5
Chondrocalcinosis	22	7.4
Gout	10	3.4
Septic arthritis	6	2.0
Non‐small‐cell lung cancer	5	1.7
Villonodular synovitis	4	1.3
Emarthrosis	2	0.7