Much attention has recently been focused on the relationship between the hip and spine and its contribution to postoperative instability following total hip arthroplasty. However, the terminology can be confusing. Through an understanding of spinopelvic parameters, spinopelvic motion, and the interplay between the spine and pelvis, the surgeon can plan for and decrease the risk of instability after total hip arthroplasty. This review details spinopelvic parameters that predispose to instability and guides readers in understanding spinopelvic motion as it relates to THA instability.
