A human experimental bone pain model
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Trine Andresen
, Lars Arendt-Nielsen , Christina Brock , Asbjørn Drewes , Hongling Nie and Anne Olesen
Introduction
Bone associated pain from, e.g., metastases is poorly understood. The aim of the study was to develop a human experimental model, which could evoke pain from the periosteum.
Method
Fourteen healthy males (mean age 25 years, range 21–34) were included. Each subject participated in two sessions where pressure pain thresholds (PPT) were estimated with different probe sizes. A computer controlled algometer was applied to the skin over right medial tibia and a handhold algometer over the left medial tibia. Stimulation was performed before and after local anaesthesia (LA) to estimate influence of skin. In addition test-retest variation was evaluated.
Results
For both algometers there was no major difference within subjects (ICC > 0.6) or between subjects (CV < 13%). Computer controlled algometer: For probe size 6mm there was a significant difference in PPT before and after LA (P=0.007). Probe size 8mm showed no significant difference before and after LA (P=0.19). No significant differences were seen between sessions for both probe sizes (6mm: P = 0.43; 8mm: P=0.32). Handhold algometer: No significant differences in PPT for any probe sizes (2, 4, 6, 8 and 10mm) were seen before and after LA (P=0.4; 0.2; 0.01; 0.08 and 0.5). For probe sizes 2 and 10mm there were no significant differences between sessions (P=0.2; 0.3). Probe sizes 4, 6 and 8mm showed significant differences in PPT between sessions (P=0.03; 0.045; 0.006) indicating bias of the method over time.
Conclusion
Both methods could reliably evoke experimental periosteum associated pain. The handhold algometer is in practice easier to use.
© 2010 Scandinavian Association for the Study of Pain
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