Canted seating of the Stryker Modular Dual Mobility liner within a Trident hemispherical acetabular shell

Canted seating of the Stryker Modular Dual Mobility liner within a Trident hemispherical acetabular shell

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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 Hoodia 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 Teddy Bear the liner being well seated.