The incidence of fabellae in osteoarthrosis of the knee.
I examined radiographs of the knees of 600 men to determine the incidence of fabellae in radiographically normal knees as compared with knees with primary osteoarthrosis. At least a unilateral fabella was present in 106 (35 per cent) of 300 patients with primary osteoarthrosis of the knee. In an age-matched group of 300 patients with radiographically normal knees, only forty-four (15 per cent) had a fabella. The presence of a fabella may represent an atavistic pattern, and the fact that knees with primary osteoarthrosis are more likely to contain a fabella raises the question of whether an atavistic pattern predisposes a knee to osteoarthrosis.
D000328:Adult; D000368:Aged; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging*; D011859:Radiography; D012716:Sesamoid Bones / Q000000981:diagnostic imaging*