Immediate Changes of Bone Density Caused by the Implantation of a Femoral Stem - A Dexa Study:

摘要: Considerable immediate periprosthetic bone density changes after implantation of femoral stems have been observed comparing DEXA measurements taken pre- and post-operatively. This is important in relation to the interpretation studies. We analysed these under standardised experimental conditions. Five human femora were implanted with a custom made stem ten standard cementless prosthesis. Densitometry was performed at various stages implantation. Following rasping only slight noted (-2.7% +0.7%). Comparing post-implantation pre-operative measurements, all proximal press-fit demonstrated clear increases +11% +14%. In contrast, prosthesis distal showed loss -5% -2% zones. Measurements following removal implants hardly any (0% -4%) compared measurements. concluded that compacting trabecular or due are not main causes changes. Substantial measuring errors exist. For examination changes, initial should be used as baseline for comparison. Studies commence an postoperative measurement.