Experience with Microbial Collagenase (trade name Xiapex) in Europe currently is limited to randomised controlled studies.While such studies are essential to determine efficacy and safety of the product (usually compared to placebo), they provide no information on the effectiveness of the drug and further aspects of its use (feasibility, tolerability, quality of life and other patient-related outcomes) in the typical "real-life" setting under clinical practice conditions.Thus, the present study aims to collect data on the