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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2018 | Research article

Factors affecting intraosseous pressure measurement

Authors: Michael Beverly, David Murray

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2018

Abstract

Background

Although a raised intraosseous pressure (IOP) has been found in osteoarthritis and osteonecrosis, the normal physiology of subchondral circulation is poorly understood. We developed an animal model and explored the physiology of normal subchondral perfusion and IOP.

Methods

In 21 anaesthetised rabbits, 44 intraosseous needles were placed in the subchondral bone of the femoral head (n = 6), femoral condyle (n = 7) or proximal tibia (n = 31). Needles were connected to pressure transducers and a chart recorder. In 14 subjects, the proximal femoral artery and vein were clamped alternately. In five subjects, arterial pressure was measured simultaneously in the opposite femoral artery.

Results

The average IOP at all 44 sites was 24.5 mmHg with variability within SD 6.8 and between subjects SD 11.5. IOP was not significantly influenced by gender, weight, site or size of a needle. Needle clearance by flushing caused a prolonged drop in IOP whereas after clearance by aspiration, recovery was rapid. IOP recordings exhibited wave patterns synchronous with the arterial pulse, with respiration and with drug circulation time. There was a correlation between IOP and blood pressure (13 sites in 5 subjects, Pearson correlation 0.829, p < 0.0005). There was a correlation between IOP and the associated pulse pressure (PP) in 44 sites among 21 subjects (Pearson correlation 0.788, p < 0.001). In 14 subjects (31 sites), arterial occlusion caused a significant reduction in IOP and loss of PP (p < 0.0001). Venous occlusion significantly raised IOP with preservation of the PP (p < 0.012).

Conclusion

Our study shows that subchondral cancellous bone behaves as a perfused tissue and that IOP is mainly a reflection of arterial supply. A single measure of IOP is variable and reflects only perfusion at the needle tip rather than being a measure of venous back pressure. Alternate proximal vessel clamping offers a new means of exploring the physiology of subchondral perfusion. We describe a model that will allow further study of IOP such as during loading.

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Title: Factors affecting intraosseous pressure measurement
Authors: Michael Beverly
David Murray
Publication date: 01-12-2018
Publisher: BioMed Central
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2018
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-018-0877-z

ACC 2024 Congress

Springer Medicine

Factors affecting intraosseous pressure measurement

Abstract

Background

Methods

Results

Conclusion

ACC 2024 Congress

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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