Factors predicting the 1-year outcome of collagenase treatment for Dupuytren's disease.

Introduction: Several studies have investigated the clinical outcome after collagenase treatment for Dupuytren's disease in terms of range of motion of the affected finger. However, good objective clinical outcome defined by a small remaining flexion contracture does not necessarily translate into satisfactory patient-subjective hand function. The aim of the present study was to identify predictors of patient-reported as well as objective clinical outcome in patients 1 year after collagenase treatment for Dupuytren's disease.
Materials and Methods: Socio-demographic and disease-related data of 92 Dupuytren patients were collected prior to the intervention. Flexion contracture of the most affected finger was measured at baseline and 1 year after treatment. Patients also completed the brief Michigan Hand Outcomes Questionnaire (brief MHQ) before the intervention and at 1-year follow-up. First, univariate correlations using Pearson's correlation coefficient of the baseline variables with the two target variables were investigated. All variables with r > 0.35 were selected for a multivariate linear stepwise backwards regression model.
Results: The mean brief MHQ score increased between baseline (72 ± 14) and the 1-year follow-up (85 ± 15) (p ≤ 0.001) and baseline flexion contracture decreased from 76° (± 26) to 33° (± 31) (p ≤ 0.001). Higher hand function at baseline (R ²  = 0.31) and less flexion contracture (R ²  = 0.46) were identified as positive predictors for the outcome 1 year after collagenase treatment for Dupuytren's disease. Other variables such as age, gender, manual work and if the MCP or PIP joint was affected did not determine outcome in our patient series.
Conclusions: Collagenase treatment resulted in considerable improvement in flexion contracture as well as patient-reported hand function at the 1-year follow-up. Clinicians can expect better outcome after collagenase infiltration in patients with less flexion contracture and in patients showing good initial self-reported hand function.