[In Process Citation].

Hip arthroscopy is a rapidly evolving field in terms of indications, prognostic factors and surgical technique. The most common indication for hip arthroscopy is femuro-acetabular impingement. Femuro-acetabular impingement (FAI) may produce symtoms of pain in association with athletic activity or in daily life. FAI is caused by osteophytes on the cervikal head-neck junction (cam) or at the acetabular edge (pincer). Treatment of femuro-acetabular impingement includes resection of the impinging osteophytes, preferably using arthroscopic technique. In Sweden, research is performed in order to clarify possible causes of FAI and to prospectively evaluate the outcome of hip arthroscopy.