A case of recurrent proximal femoral fracture after open reduction and internal fixation with bilateral locking plates for a Rorabeck type II periprosthetic fracture.

Introduction And Importance: Periprosthetic distal femur fractures (PDFFs) are rare complications that may occur during or after total knee arthroplasty (TKA). The incidence of PDFFs is increasing. Plate internal fixation has demonstrated positive results. However, there is limited research available on the recurrence of periimplant fractures following open reduction and internal fixation with bilateral locking plates.

Case Presentation: A 70-year-old female patient was diagnosed with a Rorabeck type II fracture. Based on the patient's physical condition and available surgical options, minimally invasive open reduction, bilateral plate fixation, and allograft artificial bone grafting were chosen. The postoperative recovery was successful. However, the patient experienced a fall 2 months after the surgery, resulting in a proximal femoral fracture. After considering the patient's condition and family preferences, conservative treatment was ultimately decided upon.

Clinical Discussion: Minimally invasive bilateral Locking Compression Plate (LCP) as a surgical approach can effectively reduce surgical risks prior to the procedure. Careful selection of screws and the use of C-arm fluoroscopy during plate contouring and fixation are essential to prevent screw penetration through the contralateral cortex. Treatment outcomes were not impacted in patients with normal bone mass; however, in this particular case, the patient had severe osteoporosis, significantly increasing the risk of refracture. It is crucial to improve postoperative monitoring and raise awareness about safety among patients and their families.

Conclusion: The management of periprosthetic distal femur fractures (PDFFs) is influenced by the type of fracture and bone quality. Mechanical stability and stress dispersion of internal fixation are key factors to consider. In the perioperative setting, involving experienced clinicians is essential to reduce the risk of secondary injuries that may impact treatment outcomes, especially when choosing screws for fixation in patients with low bone density.