Feasibility for mapping cartilage t1 relaxation times in the distal metacarpus3/metatarsus3 of thoroughbred racehorses using delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC): normal cadaver study.

This paper assesses the potential of using delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC) to quantitatively measure articular cartilage damage in horses. Conducted on 20 horse cadavers, the study finds that the technique is effective and suggests optimal times for post-contrast scans.

Study Objective and Methodology

• The primary goal of this study was to determine whether dGEMRIC can be used for mapping and measuring changes in T1 relaxation times in the articular cartilage of horse joints.
• This research is significant because osteoarthritis of the metacarpo/metatarsophalangeal joints is a major cause of poor performance in horses, and the ability to noninvasively quantify cartilage damage could greatly aid in diagnosis and treatment.
• The study employed 20 Thoroughbred horse cadavers’ distal metacarpus3/metatarsus3 (Mc3/Mt3) articular cartilage.
• The researchers measured T1 relaxation time from scans taken pre-contrast and at intervals of 30, 60, 120, and 180 minutes following the injection of Gd-DTPA(2-), using five regions of interest (sites) in the cartilage.

Key Findings

• The results showed a significant decrease in T1 relaxation time between the pre-contrast scan and the post-injection scans at all intervals for all sites.
• There was a significant increase in T1 relaxation time between the 60- and 180-minute scans and the 120- and 180-minute scans across all sites.
• For sites 1-4, a significant increase in T1 relaxation time from 30 to 180 minutes post-injection was observed.
• There were significant differences between all sites at all times, indicating variability in the cartilage response.

Conclusions and Future Directions

• Based on the results, the researchers concluded that dGEMRIC can be used effectively to measure and map changes in T1 relaxation times in horse join cartilage, validating its feasibility as a non-invasive technique for assessing articular cartilage damage.
• The study also suggested the optimal times for post-contrast scans are in between 60 to 120 minutes.
• While this study made significant contributions to the field, it was carried out on cadavers, and the authors note that further research is needed to confirm whether these findings are applicable to live horses.