Abstract
The frequency of small joint effusions in the population of Sudbury, Massachusetts, as determined by the clinical maneuver called the “bulge sign”, was estimated to be 16%. The prevalence rate was found to be higher in males than in females, but the increase with advancing years was prominent in women only. While clinically demonstrable fluid in the knee-joint was more common in persons with other signs of joint disease, these individuals formed a small proportion of the total population with demonstrable knee effusions. It is concluded that the sign also identifies a hitherto unrecognized upper range of normal for knee-joint fluid, and it is tentatively proposed that physique may be a factor related to knee-joint fluid volume.
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