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Prevalence of weakness and factors mediating discrepancy between reported and observed leg weakness in people with sciatica
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Prevalence of weakness and factors mediating discrepancy between reported and observed leg weakness in people with sciatica
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Prevalence of weakness and factors mediating discrepancy between reported and observed leg weakness in people with sciatica
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Journal Article
Prevalence of weakness and factors mediating discrepancy between reported and observed leg weakness in people with sciatica
2024
Overview
Purpose
To establish the prevalence and agreement between reported and observed leg weakness in people with sciatica. To establish which factors mediate any identified difference between reported and observed leg weakness in people with sciatica.
Methods
68 people with a clinical diagnosis of sciatica, records from spinal service, secondary care NHS Hospital, England, UK reviewed. Primary outcome measures were the sciatica bothersome index for reported leg weakness and the Medical Research Council scale for observed weakness. Agreement was established with Cohen’s Kappa and intraclass correlation coefficient. Potential factors that may mediate a difference between reported and observed weakness included leg pain, sciatica bothersome index sensory subscale, age, hospital anxiety and depression subscale for anxiety.
Results
85% of patients reported weakness but only 34% had observed weakness. Cohen’s Kappa (0.066, 95% CI − 0.53, 0.186;
p
= 0.317)] and ICC 0.213 (95% CI − 0.26, 0.428,
p
= 0.040) both showed poor agreement between reported and observed weakness. The difference between reported and observed measures of weakness was mediated by the severity of leg pain (b = 0.281,
p
= 0.024) and age (b = 0.253,
p
= 0.042).
Conclusion
There is a high prevalence of reported leg weakness in people with sciatica, which is not reflected in observed clinical measures of weakness. Differences between reported and observed weakness may be driven by the severity of leg pain and age. Further work needs to establish whether other objective measures can detect patient reported weakness.
