The Impact of Implant Fixation Type on Reoperation Rates Following Endoprosthetic Reconstruction Surgery

Area of Science:

• Orthopedic Surgery
• Oncology
• Biomaterials Science

Background:

• Limited prospective data exists comparing cemented and uncemented implants in endoprosthetic reconstruction.
• The study addresses a critical gap in understanding implant fixation strategies for lower-extremity bone tumors.

Purpose of the Study:

• To evaluate the impact of cemented versus uncemented fixation on the rate of all-cause reoperation within one year following endoprosthetic reconstruction.
• To compare septic and aseptic reoperation rates between the two fixation methods.

Main Methods:

• Secondary analysis of the Prophylactic Antibiotic Regimens In Tumor Surgery (PARITY) trial.
• Inclusion of 503 patients undergoing endoprosthetic reconstruction for lower-extremity bone tumors.
• Multivariate Cox proportional hazards model used to analyze implant fixation and reoperation rates.

Main Results:

• No significant difference in all-cause reoperation rates at 1 year between cemented (388 implants) and uncemented (115 implants) fixation (HR, 1.05; 95% CI, 0.70 to 1.57; p = 0.761).
• Total operative time was an independent predictor of reoperation (HR per hour, 1.10; 95% CI, 1.02 to 1.20; p = 0.019).
• Lower reoperation risk observed in patients with benign aggressive disease or metastatic bone disease.

Conclusions:

• Cemented fixation does not significantly affect 1-year reoperation rates compared to uncemented fixation in endoprosthetic reconstruction.
• Further investigation is needed to determine the long-term implant survival differences between cemented and uncemented fixation methods.