Objective: The study is aimed to investigate the relative frequency of congenital upper limb anomalies (CULA) in southern Taiwan using the updated Oberg, Manske, and Tonkin (OMT) classification and to evaluate the practicality of the new classification system.
Material and Methods: We retrospectively reviewed patients with CULA from 1987 to 2021 in a referral center in southern Taiwan. All patients were analyzed by medical records and radiographs, and classified according to the updated OMT classification.
Results: A total of 1188 patients with 1307 congenital upper limb anomalies were collected. The most common type of CULA was malformations (84%), followed by dysplasias (11%), deformations (4%) and syndromes (1%). Among malformations, radial polydactyly was the most common anomaly (62%), followed by clinodactyly (9%) and simple syndactyly (6%). Among dysplasias, camptodatyly was the most common (36%), followed by thumb in palm deformity (31%) and vascular tumors (12%). Constricted ring sequence was accounted for all deformations. Most cases in the syndromes category were Apert syndrome.
Conclusions: Malformations was the most common CULA among 1188 patients over a 30-year-period in southern Taiwan. The updated OMT classification was useful in classifying all the CULA precisely.

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