Extra-articular impingement: a new cause of refractive groin pain following THA

Abstract

This study aimed at introducing a new cause of groin pain following total hip arthroplasty (THA): extra-articular impingement (EAI). This was defined as impingement in midflexion between the anterior portion of the greater trochanter (GT) and the anterior inferior iliac spine (AIIS). 20 patients were included. All patients had revision surgery between January 2014 and April 2016 in hospital ' Ziekenhuis Oost- Limburg'. The outcome measurements were a specific clinical examination, a marcainisation test, questionnaires (HHS, HOOS, SF-36) and patient satisfaction questions. The conclusion of the study was that EAI should be considered as a possible cause of refractive groin pain after THA. Specific clinical and diagnostic tests can be used to confirm the diagnosis. Revision surgery gave good pain relieve and improved the outcome.