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Related to Boutonniere deformity: mallet finger, swan neck deformity
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The boutonniere deformity referred to disruption of the central slip at the insertion into the base of the middle phalanx and leaded to the flexion of the PIPJ and extension at the DIPJ [Figure 8].
On general examination patient had pallor, deep icterus, swan neck deformity in the middle finger of right hand, boutonniere deformity in right little finger.
In terms of the piano key sign, boutonniere deformity, and number of fingers with this deformity, the right hand had significantly higher figures than the left (p=0.037, r=0.582; p=0.001, r=0.837; p=0.001, r=0.421, respectively).