Ultrasonographic evaluation of the coxofemoral joint region in young foals.

The study aimed to use ultrasound to map the hip region in young foals in order to gather reference data that may assist in identifying potential abnormalities. Using ultrasonography, 38 examinations were carried out on both cadavers and live healthy foals, and the results showed a good correlation between the ultrasound measurements and the actual anatomical dimensions, suggesting ultrasound as a useful diagnostic tool in neonates.

Methodology of the Study

• The research utilized a 7.5 MHz linear transducer to perform ultrasonographic evaluation.
• A total of 38 examinations were carried out by the researchers. Of these, 10 examinations were done on cadavers (totaling 20 joints) and 28 examinations occurred on living, healthy foals (totaling 55 joints) aged up to 8 weeks.
• The ultrasound scans were performed in a specific plane, known as caudolateral-craniomedial oblique, on an imaginary line connecting two anatomical landmarks – the greater trochanter and the cranial edge of the tuber sacrale.

Results of Ultrasonographic Evaluation

• The relatively thin muscular layer covering the hip joint in foals facilitated good image quality in the ultrasounds.
• An array of structures in the coxofemoral (hip) region were evaluated. These included – the bone surface of the ilium and acetabulum, the subchondral bone on the femoral head and greater trochanter, the joint cartilage on the femoral head, the fibrocartilaginous acetabular labrum, the femoral capital physis, the cartilaginous layer covering the greater trochanter, the joint capsule, the visibility of synovial fluid, and the gluteal muscles.

Validation of the Method

• In an attempt to validate the ultrasound’s precision, the researchers performed a bilateral anatomical frozen section in the plane of examination on one cadaver, allowing them to make a direct comparison with the ultrasound images.
• A robust correlation was found between the dimensions measured through ultrasonographic evaluation and the actual anatomical measurements found through the frozen section. This suggests that ultrasonography provides accurate measurements of the foals’ hip region.

Conclusion

• The results of the study indicate that ultrasound is a valuable diagnostic tool, especially in neonates, due to its ability to provide clear, precise images.
• By establishing ultrasonographic reference values for the hip joint region in foals, the study aids in the interpretation and diagnosis of potential pathological findings in the future.