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Amputation level assessment using lightguide spectrophotometry

D K Harrison1, P T McCollum, D J Newton

  • 1Department of Medical Physics, Ninewells Hospital and Medical School, Dundee, UK.

Prosthetics and Orthotics International
|December 1, 1995
PubMed
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Lightguide spectrophotometry accurately predicts trans-tibial amputation stump healing. This method assesses haemoglobin oxygenation and tissue hypoxia, ensuring successful outcomes for patients with critical lower limb ischaemia.

Area of Science:

  • Vascular Surgery
  • Medical Diagnostics
  • Biophotonics

Background:

  • Critical lower limb ischaemia poses challenges for amputation stump healing.
  • Accurate prediction of flap viability is crucial for successful surgical outcomes.
  • Non-invasive methods for assessing tissue oxygenation are needed.

Purpose of the Study:

  • To evaluate lightguide spectrophotometry for predicting stump healing in trans-tibial amputations.
  • To correlate skin oxygenation and tissue hypoxia with amputation outcomes.
  • To establish criteria for predicting flap healing potential.

Main Methods:

  • Visible wavelength lightguide spectrophotometry measured haemoglobin oxygenation (SO2) at proposed amputation sites.
  • Degree of tissue hypoxia (DTH) was calculated based on SO2 values along the limb.

Related Experiment Videos

  • SO2 and DTH were compared with skin blood flow and clinical outcomes in 41 patients undergoing amputation (TTA/TFA).

    • Main Results:

    • Successful trans-tibial amputations (TTAs) showed a minimum mean SO2 of 30% at measurement sites.
    • A maximum degree of tissue hypoxia (DTH) of 15% along the limb predicted successful healing.
    • These criteria achieved 1.0 sensitivity and selectivity for predicting successful TTA outcomes.

    Conclusions:

    • Lightguide spectrophotometry is a reliable, non-invasive tool for predicting trans-tibial amputation stump healing.
    • Specific SO2 and DTH thresholds can accurately identify patients likely to achieve successful flap healing.
    • This technique can improve patient selection and surgical planning for lower limb amputations.