In Western countries the health care system faces numerous challenges. We explore the potential of the normative practice approach to analyze the present system, to provide new insights in the redesign of the health care network, and to offer new concepts to understand the needs and wishes of patients. We present a case study of assistive devices in orthopaedics. This article shows that the Triple I variant of the practice model is very fruitful to understand the organizational embedding of professional practices, to understand the health care system as chains of professional practices, and to understand the influence of stakeholders. In this study we introduce the idea of user practices to investigate the social environment of patients and to make the needs and wishes of patients explicit.