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Acute effects of intramedullary reaming on bone blood flow in rats
1Department of Orthopedics, University Hospital, Tromsø, Norway.
Abstract:
We examined the acute effects of increasing degree of intramedullary reaming on bone blood flow in 27 male Wistar rats by use of the microsphere method. A marginal reduction in total bone and cortical bone blood flow was seen when the femoral canal was reamed to a diameter smaller than the medullary cavity (1.5 mm). Reaming equal to the antero-posterior diameter (1.8 mm) halved total bone flow and reduced cortical blood flow by one third. Reaming equal to the transverse diameter (2.1 mm) reduced total bone flow to one third and cortical bone flow by one third. Intramedullary reaming of the tibia to 1.5 mm reduced total blood flow about 50 percent whereas cortical flow in the proximal half was unchanged. We conclude that modest intramedullary reaming has little effect on total and cortical blood flows, whereas reaming which involves destruction of the endosteal cortex reduces both total bone and cortical blood flows.
Insights
Intramedullary reaming significantly impacts bone blood flow. Modest reaming has minimal effects, but significant reaming that damages the endosteal cortex drastically reduces bone and cortical blood flow.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Surgical Innovation
Background:
- Intramedullary reaming is a common surgical procedure.
- Understanding its effects on bone physiology is crucial for patient outcomes.
Purpose of the Study:
- To investigate the acute effects of varying degrees of intramedullary reaming on bone blood flow.
- To determine the threshold of reaming that significantly impacts bone perfusion.
Main Methods:
- Utilized the microsphere method for precise blood flow measurement.
- Examined 27 male Wistar rats, assessing femoral and tibial bone blood flow.
- Experimentally increased intramedullary reaming diameters in a controlled manner.
Main Results:
- Reaming to 1.5 mm caused a marginal reduction in total and cortical bone blood flow.
- Reaming to 1.8 mm (antero-posterior diameter) halved total bone flow and reduced cortical flow by one third.
- Reaming to 2.1 mm (transverse diameter) reduced total bone flow to one third and cortical flow by one third.
- Tibia reaming to 1.5 mm reduced total blood flow by approximately 50% with unchanged cortical flow.
Conclusions:
- Modest intramedullary reaming demonstrates minimal impact on total and cortical bone blood flow.
- Reaming that involves endosteal cortex destruction significantly reduces both total bone and cortical blood flow.
- Careful consideration of reaming diameter is essential to preserve bone perfusion during orthopedic procedures.