The Dorr Classification for Spinopelvic Functional Safe Component Positioning in Total Hip Replacement: A Primer for All

Instability following total hip arthroplasty remains the most common cause for revision surgery. Preoperative identification of abnormalities in pelvic tilt and postural mobility can lead to patient specific alterations in component position to insure against impingement and mechanical instability. The Dorr Classification for spinopelvic outliers and associated component positional recommendations were introduced in 2017 but remains underutilized as a planning aid. This review article presents a focused understanding of the spinopelvic mechanics, the outlier groupings, and the recommendations hip surgeons can apply in evaluating and treating patients with spinopelvic abnormalities requiring hip replacement surgery.