Chronic total hip arthroplasty instability-Causes and cures

Chronic instability following total hip arthroplasty (THA) is a complex problem and is the most common reason for revision THA. Understanding the etiology of instability is paramount to choosing the appropriate treatment. In general, component malposition should always be addressed. Abductor deficiency, being seen more often with metal on metal THA failures, is a difficult problem to address that typically requires the use of a constrained liner. The use of dual mobility articulations have recently become popular and have demonstrated good early results for preventing re-revision in patients at high risk for instability.