Dual‐mobility hip components provide for an additional articular surface, with the goal of improving range of motion, jump distance (ie, vertical or inferior head displacement required for dislocation), and stability of the total hip arthroplasty. A large polyethylene head articulates with a polished metal acetabular component, and an additional smaller metal head is snap‐fit within the polyethylene. New components have recently been released for use in North America. Although these devices are routinely used in some European centers for primary hip arthroplasty, their greatest utility may be to manage recurrent dislocation in the setting of revision hip arthroplasty. Several small retrospective series have shown satisfactory results for this indication at short‐ to midterm follow‐up. Polyethylene wear and intraprosthetic dislocation are concerns, as is the lack of long‐term data. Caution is thus advised in the routine use of dual‐mobility components in primary and revision total hip arthroplasty.
From the Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC (Dr. Lachiewicz and Dr. Watters), the Durham VA Medical Center, Durham, NC (Dr. Lachiewicz), and Chapel Hill Orthopedics Surgery and Sports Medicine, Chapel Hill, NC (Dr. Lachiewicz).
Dr. Lachiewicz or an immediate family member is a member of a speakers' bureau or has made paid presentations on behalf of Cadence, serves as a paid consultant to or is an employee of the Gerson Lehrman Group and Guidepoint Global Advisors, has received research or institutional support from Zimmer, and serves as a board member, owner, officer, or committee member of the Hip Society, the Orthopaedic Surgery & Trauma Society, and the Southern Orthopaedic Association. Neither Dr. Watters nor any immediate family member has received anything of value from or owns stock in a commercial company or institution related directly or indirectly to the subject of this article.