Fingernail psoriasis reconsidered: a case-control study.

Area of Science:

• Dermatology
• Clinical Research
• Nail Diseases

Background:

• Limited literature exists on clinical signs and frequency of nail psoriasis.
• Recent studies predominantly focus on signs within the Nail Psoriasis Severity Index (NAPSI).

Purpose of the Study:

• To characterize the clinical presentation of fingernail psoriasis.
• To compare fingernail psoriasis signs between affected patients and healthy controls.

Main Methods:

• Data collected from 49 patients with fingernail psoriasis and 49 healthy controls.
• Utilized questionnaires and clinical examinations for data acquisition.
• Assessed disease severity using the Nail Psoriasis Severity Index (NAPSI).

Main Results:

• Mean NAPSI scores were 26.6 for patients and 3.6 for controls.
• Onycholysis and splinter hemorrhages were the most frequent findings in nail psoriasis patients.
• Leukonychia was more common in controls, while longitudinal ridges and Beau lines were more frequent in patients but not in NAPSI.

Conclusions:

• The NAPSI effectively differentiates fingernail psoriasis patients from healthy individuals.
• Onycholysis and splinter hemorrhages are key indicators of nail psoriasis.
• The inclusion of leukonychia in NAPSI is questionable, and longitudinal ridges/Beau lines warrant consideration for future assessment.