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Assessment of efficiency of mirror therapy in preventing phantom limb pain in patients undergoing below-knee amputation surgery—a randomized clinical trial

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Abstract

Purpose and objectives

Phantom limb pain (PLP) is a major cause of physical limitation and disability accounting for about 85% of amputated patients. Mirror therapy is used as a therapeutic modality for patients with phantom limb pain. Primary objective was to study the incidence of PLP at 6 months following below-knee amputation between the mirror therapy group and control group.

Methods

Patients posted for below-knee amputation surgery were randomized into two groups. Patients allocated to group M received mirror therapy in post-operative period. Two sessions of therapy were given per day for 7 days and each session lasted for 20 min. Patients who developed pain from the missing portion of the amputated limb were considered to have PLP. All patients were followed up for six months and the time of occurrence of PLP and intensity of the pain were recorded among other demographic factors.

Results

A total of 120 patients completed the study after recruitment. The demographic parameters were comparable between the two groups. Overall incidence of phantom limb pain was significantly higher in the control group (Group C) when compared to the mirror therapy (Group M) group [Group M = 7 (11.7%) vs Group C = 17 (28.3%); p = 0.022]. Intensity of PLP measured on the Numerical Rating Scale (NRS) was significantly lower at 3 months in Group M compared to Group C among patients who developed PLP [NRS − median (Inter quartile range): Group M 5 (4,5) vs Group C 6 (5,6); p 0.001].

Conclusion

Mirror therapy reduced the incidence of phantom limb pain when administered pre-emptively in patients undergoing amputation surgeries. The severity of the pain was also found to be lower at 3 months in patients who received pre-emptive mirror therapy.

Trial Registration

This prospective study was registered in the clinical trial registry of India. Trial Registration number: CTRI/2020/07/026488.

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Data availability

The datasets generated and analysed during this study are available from the corresponding author (Pankaj Kundra) on reasonable request.

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Authors and Affiliations

Authors

Contributions

SP: term, conceptualization, methodology, investigation, resources, data curation, writing-original draft, writing-review and editing, and data analysis. PK: term, conceptualization, methodology, investigation, resources, data curation, writing-original draft, writing-review and editing, and data analysis. MS: methodology, investigation, resources, data curation, writing-original draft, writing-review and editing, and data analysis. SCS: resources, data curation, writing-original draft, writing-review and editing, and data analysis. SK: resources, writing-original draft, writing-review and editing, and data analysis.

Corresponding author

Correspondence to Pankaj Kundra.

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Purushothaman, S., Kundra, P., Senthilnathan, M. et al. Assessment of efficiency of mirror therapy in preventing phantom limb pain in patients undergoing below-knee amputation surgery—a randomized clinical trial. J Anesth 37, 387–393 (2023). https://doi.org/10.1007/s00540-023-03173-9

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  • DOI: https://doi.org/10.1007/s00540-023-03173-9

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