Radiostereometric Analysis of Fracture Healing in Distal Femur Fractures

The investigators are doing this research study to look at how distal femoral fractures (knee bone break) heal. In this study, the investigators will use Radiostereometric Analysis (RSA) to look at how the pieces of femur bone move as the bone heals. RSA is a special x-ray that uses radiographs to measure very small movements in the bone over time. The question that will be answered by this study is whether RSA can be used as a tool to monitor fracture healing.