Use of infrared thermography to detect injections and palmar digital neurectomy in horses.

This research article discusses the application of thermography for detecting distinct procedures in horses, such as injection of analgesic and neurolytic agents, and surgical palmar digital neurectomy. However, while the technology is found to be sensitive in detecting heat pattern changes, it lacks the specificity to differentiate between medical procedures and injuries that induce inflammation.

Objective of the Research

• The primary objective of this study was to evaluate the potential of thermography, a technique that detects heat as an infrared radiation emitted from the skin, for finding alterations following specific procedures in horses. Since the skin temperature often mirrors the conditions of underlying tissues, a change in thermal pattern may signify inflammation in superficial regions.

Methods and Procedures

• The researchers studied multiple procedures, including the injection into the lumbar region, suspensory ligaments, tibial nerve, palmar digital nerves, and the surgical operation called palmar digital neurectomy. Thermographic images were collected before and after the execution of these procedures up to the point when a significant difference in thermal patterns could no longer be identified.

Results of the study

• The study findings revealed that thermography could detect thermal patterns from certain procedures for specific periods. For instance, the lumbar region injection and the suspensory ligament produced observable heat pattern changes up to two days. In addition, infiltration of the tibial nerve with a neurolytic agent provided noticeable changes for two days.
• Analgesia of the palmar nerves remained significant for 24 hours with bupivicaine, whereas it lasted for five days with ammonium chloride. However, palmar digital neurectomy resulted in more inconsistent thermal patterns.

Limitations of Thermography

• Despite its sensitivity in detecting heat pattern shifts from control regions, thermography exhibited limitations in terms of specificity. The technology is unable to distinguish effectively between different surgical procedures and injuries that instigate an inflammatory response. This lack of specificity points to the need for further refinement of this technique or the use of adjunctive diagnostic tools for more accurate interpretations in such applications.