Canted seating of the Stryker Modular Dual Mobility liner within a Trident hemispherical acetabular shell.
A 75-year-old woman who suffered a left femoral neck fracture underwent a left total hip arthroplasty using a Stryker Trident (Kalamazoo, MI) hemispherical acetabular shell and Modular Dual Mobility (MDM) metal liner. Post-operative radiographs demonstrated canted seating of the liner. The patient was taken immediately back to the operating room where the acetabular liner appeared well seated superiorly but was in a canted position inferiorly. Removal and replacement was performed and post-operative radiographs demonstrated complete seating. Subsequent follow up at 6 months demonstrated good clinical function with no adverse radiographic findings. Canted seating is a potential complication of the MDM metal liner. Providers should be aware of potential incomplete seating inferiorly despite the superior portion of the liner being well seated.
University of North Carolina, Department of Orthopaedic Surgery, Chapel Hill, NC, USA.
Scott M
SM
Eskildsen
University of North Carolina, Department of Orthopaedic Surgery, Chapel Hill, NC, USA.
Erik C
EC
Olsson
University of North Carolina, Department of Orthopaedic Surgery, Chapel Hill, NC, USA.
Daniel J
DJ
Del Gaizo
Dislocation; Dual mobility component