Rood & Riddle Report Spring 2022

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News from Your Equine Health Care Provider | Vol. 11 | Spring 2022

IN THIS ISSUE

Rood & Riddle Acquires a PET Scan Clinician Spotlight

-Dr. Rolf Embertson

Rood & Riddle News Hats Off Day to be held July 30 Dr. Kathleen Paasch -Pre-sale Radiographs

Dr. Katy Dern

-Enteroliths

Dr. Jordan Kiviniemi-Moore -Stoic Horses

RRVP

From the Pharmacy -Meet T.C. Lane

StallSide

Rood & Riddle Acquires PET Scan First Placement in a Private Hospital Rood & Riddle Equine Hospital is pleased to announce the installation of an equine positron emission tomography (PET) scanner at the Lexington, Kentucky, hospital. This modality is used for diagnostic imaging in select lameness cases and can be used in standing, sedated horses. It does not require general anesthesia. The scans result in quantitative, three-dimensional, cross-sectional images that can help accurately pinpoint the location and severity of a problem. Any area on the limb from the foot to the carpus (knee) and tarsus (hock) can be imaged. Two different types of scans can be performed. One looks at areas of increased bone metabolism and is useful to identify subchondral bone disease, signs of impending fracture, suspensory ligament attachment disorders, and osteoarthritis. The other looks at the overall tissue metabolism and is useful in cases of soft tissue injury or laminitis. Rood & Riddle is the fourth location for this standing PET scanner for horses globally and is the site of the first installation at a private practice. “We are excited to introduce this new technology for our patients,” said Dr. Katherine Garrett, Rood & Riddle’s director of Imaging. “PET scans will increase our ability to detect bony injury in horses, which will hopefully lead to improved outcomes.” Orthopedic surgeon Dr. Larry Bramlage states, “We started with radiographs alone, and they depended on celluloid and silver ions for an image. Then, digital radiographs moved us forward in the quality of what we could see. Nuclear scintigraphy was the next step because we could image physiology, not just anatomy. Then, the three-dimensional imaging with computed tomography (CAT) scans and magnetic resonance imaging (MRI) further expanded our capabilities. We have now moved forward to another level with PET scanning, which combines the physiology of nuclear medicine and the three-dimensional capabilities of CAT and MRI into a three-dimensional image of bone physiology. It can also look at the three-dimensional activity of some soft tissues. PET adds significantly to our imaging and understanding of the true status of the equine athlete.” In 2015, Grayson-Jockey Club Research Foundation funded the first-ever research project that performed PET scans on equine athletes and followed that up with additional research funding in 2019. Now, this new cutting-edge research will assist vets coast to coast in identifying lameness problems that are hard to locate. “Grayson has been a longtime supporter of research on the efficacy of PET scans in diagnosing injuries in horses, and we are pleased to see a PET scanner installed at one of the premier equine hospitals in the world,” said Jamie Haydon, president of Grayson. “We are proud to have contributed to the development of a technology that will help countless horses at Rood & Riddle for years to come.” PET scans can identify areas of abnormal bone metabolism, so it’s useful to diagnose osteoarthritis, bone bruising, or inflammation that is not apparent on radiographs (x-rays). This allows us to make a diagnosis earlier and treat the problem more specifically. PET scan is performed with light sedation (not general anesthesia), and the horse can go home the day after the scan. We can image any area from the carpus (knee) or tarsus (hock) distally (see photo). The ring that goes around the horse’s leg will open if the horse moves so the horse is not trapped inside the ring. An example of this technology is below. The following diagnostic images are from the left tarsus (hock) of an off the track Thoroughbred event horse with LH lameness. A lameness exam with nerve and joint blocks localized the problem to the area of the distal tarsal joints or the proximal suspensory ligament. Ultrasound and radiographs were not able to definitively determine the cause of the lameness. The PET scan showed abnormalities in the distal intertarsal joint (yellow arrows) so we were able to conclude that osteoarthritis of the distal intertarsal joint was the problem and treat the horse accordingly. The left images are lateral views (side to side) and the right images are a dorso-plantar views (front to back). The first set of images show the PET scan and the second set of images show the PET scan superimposed on radiographs to show the exact location of the problem in the distal intertarsal joint.

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