Background: The involvement of digits in patients with multiple trigger digits often displays specific patterns. We aimed to determine the patterns of involvement of digits in multiple trigger digits and their association with patient-related factors and compare them to those of patients with a single trigger digit. Methods: All patients with trigger digits treated over a 2-year period were retrospectively examined in June 2020. Data regarding the age at occurrence of initial trigger digit, sex, occupation, presence of diabetes mellitus, carpal tunnel syndrome and de Quervain disease, and hand dominance was determined. The data obtained from patients with multiple trigger digits was compared with those with a single trigger digit. Additionally, we investigated the patterns of involvement of the first two affected digits in patients with multiple trigger digits and their association with patient-related factors and compared them to those in patients with a single trigger digit. Results: Three hundred and eighty-seven and 577 patients with multiple and single trigger digits, respectively, were studied. Their median age was 60 (range: 17-92) years. The incidence of concomitant diabetes mellitus was 150% higher in patients with multiple trigger digits than in those with a single trigger digit. Symmetric occurrence and adjacent occurrence patterns were observed in 42.4 % and 28.4% of the 387 patients, respectively. Initial onset in the fifth and sixth decades of life, female sex and a time lag between occurrences were significantly associated with symmetric occurrence. Male sex and simultaneous occurrence in two digits were significantly associated with adjacent occurrence. Diabetes mellitus was not associated with each occurrence pattern. Conclusions: We have confirmed the presence of two involvement patterns in patients with multiple trigger digits: symmetric and adjacent. Our data will help in the prevention, early detection and management of multiple trigger digits. Level of Evidence: Level III (Therapeutic).
Keywords: Epidemiology; Hand; Tendinopathy; Tendon entrapment; Trigger finger disorder.