Non-operative treatment of metacarpal fractures and patient-reported outcomes: a multicentre snapshot study

Purpose: This study aimed to investigate practice variation in non-operative treatment methods and immobilisation duration for metacarpal fractures, and to evaluate patient-reported outcomes. Methods: Conducted in 12 Dutch hospitals over three months in 2020, this study included adult patients with non-operatively treated solitary metacarpal fractures. Fractures were classified into intra-articular base, extra-articular base, shaft, neck, and intra-articular head fractures. The treatment methods (functional treatment allowing digit mobilisation or immobilisation) and immobilisation duration were assessed. Patient-reported outcomes were evaluated using the Michigan Hand Outcomes Questionnaire (MHQ) at three months post-trauma. Results: Of 389 included patients, shaft fractures were most common (n = 150, 39%), with 93% immobilised, followed by fifth metacarpal neck fractures (n = 93, 24%), with 75% immobilised. Immobilisation rates for fifth metacarpal neck fractures varied between hospitals, ranging from 29% (95% CI 0.10–0.58) to 100% (95% CI 0.78–1.00). The median immobilisation duration for all fractures was 23 days (IQR: 20–28), and hospital setting was independently associated with this duration. Patients with metacarpal shaft fractures immobilised for less than 21 days had higher MHQ scores compared to those immobilised for 21 days or more (median (IQR) 83 (76–100) versus 71 (57–89), p = 0.026). Conclusions: The results showed practice variation in the treatment of metacarpal fractures, especially in the treatment of fifth MC neck fractures, with some hospitals following the Dutch guideline that advocates functional treatment while others did not. There are suggestions that prolonged immobilisation of metacarpal shaft fractures may lead to a worse MHQ score. These findings underscore the need for adherence to treatment protocols and emphasize functional treatment to potentially improve patient outcomes and cost-effectiveness.