ArticleBMC musculoskeletal disorders2025
Ulnar polydactyly of the hand: a classification system and clinical series.
Article in BMC musculoskeletal disorders, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundUlnar polydactyly, a common congenital hand anomaly, exhibits significant phenotypic variability. Existing classification systems have limitations, particularly in categorizing rare variants. This study introduces a new classification system for ulnar polydactyly that addresses these limitations.
methodsWe retrospectively reviewed the medical records of 35 patients with ulnar polydactyly treated at our institution between 2010 and 2022. Data collected included patient demographics, clinical presentation, radiographic findings, family history, associated anomalies, and surgical procedures. Based on detailed morphological and radiographic assessments, we developed a novel classification system comprising five main types (0-4) and associated subtypes.
resultsThe 35 patients (23 males, 12 females) had a mean age of 3.2 years. Thirty patients had bilateral involvement, with 16 exhibiting symmetry. In total, 65 hands were affected, and one hand was excluded because the patient underwent surgery in another hospital. Type 0 was the most common (38 cases), followed by Type 4 (19 cases), Type 3 (4 cases), and Type 1 (3 cases). Our classification system effectively categorized all cases, including rare variants such as Type 1b (duplicated distal phalanx) and Type 4d (duplication originating from the deformed fourth metacarpal), which are not adequately addressed by previous classifications.
conclusionsExisting classification systems for ulnar polydactyly omit two key variants: Type 1b (duplicated distal phalanx) and Type 4d (duplication from the deformed fourth metacarpal). Our system specifically incorporates these types, providing a more comprehensive framework to guide diagnosis and improve surgical planning for these rare conditions.
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