Overview
What is boutonnière (buttonhole) deformity (BD)?
What is the anatomy of the fingers relevant to boutonnière (buttonhole) deformity (BD)?
What is the pathophysiology of boutonnière (buttonhole) deformity (BD)?
What causes boutonnière (buttonhole) deformity (BD)?
Presentation
Which clinical history findings are characteristic of boutonnière (buttonhole) deformity (BD)?
Which physical findings are characteristic of boutonnière (buttonhole) deformity (BD)?
Which tests are performed in the physical exam to evaluate boutonnière (buttonhole) deformity (BD)?
Workup
What is the role of imaging studies in the workup of boutonnière (buttonhole) deformity (BD)?
Treatment
How is acute traumatic boutonnière (buttonhole) deformity (BD) treated?
How is boutonnière (buttonhole) deformity (BD) categorized?
How is chronic boutonnière (buttonhole) deformity (BD) treated?
What are the possible complications of boutonnière (buttonhole) deformity (BD)?
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Lateral view of relevant finger anatomy.
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Normal lateral band location, dorsal to axis of rotation of proximal interphalangeal joint.
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After central slip disruption, lateral bands migrate volar to axis of rotation of proximal interphalangeal joint.
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Boutonnière deformity. Image courtesy of David Bozentka, MD, University of Pennsylvania School of Medicine, published by Medscape (Late Reconstruction of Flexor and Extensor Tendon Injuries at http://www.medscape.com/viewarticle/717388).
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Radiographic evidence of boutonnière deformities. Image courtesy of Radiopaedia.org; case by Dr Aditya Shetty (http://radiopaedia.org/cases/rheumatoid-arthritis-13).
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Bunnell safety-pin splint.
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Boutonnière deformity.