A periprosthetic distal femur fracture is a fracture close to a knee implant. This type of fracture is often difficult to fix because of the close proximity of the two surgical implants which can sometimes interfere with proper bone healing. Improper healing can cause significant impairment and sometimes requires additional surgeries to correct the problem. Despite considerable interest and research put into developing techniques to repair this fracture surgeons do not know which is the best way to treat this type of fracture.