Lewis–Rorabeck and Su classifications guide treatment; stability of the femoral component is the key decision point. Stable TKA → fixation (locking plate or retrograde nail if intercondylar box permits). Loose TKA → revision arthroplasty with long stem or distal femur replacement in poor bone stock. Biologic fixation with long, locked constructs reduces nonunion/varus collapse. Early ROM; weight‑bearing tailored to construct stability.
What is the primary classification system used for periprosthetic distal femur fractures (PDFFs)?
In the Lewis–Rorabeck classification, which type describes a displaced fracture with an intact and stable implant?
Which of the following is a key decision point in managing periprosthetic distal femur fractures?
What is the recommended treatment for a displaced periprosthetic distal femur fracture with a loose implant?
Which fracture type in the Su classification originates at the proximal edge of the femoral component and extends proximally?
What is the approximate incidence of periprosthetic distal femur fractures following primary total knee arthroplasty?
In the context of managing a periprosthetic distal femur fracture, early range of motion (ROM) is emphasized primarily for which reason?
What is a significant risk factor for developing periprosthetic distal femur fractures?
What imaging modality is recommended for assessing complex periprosthetic distal femur fractures?
Which of the following best describes the management of an undisplaced periprosthetic distal femur fracture with a stable implant?
