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Effect of head position on radiographic assessment of laryngeal tie-forward procedure in horses.
Abstract: To assess the effect of head position on relative position of the larynx and hyoid apparatus in horses with palatal dysfunction, and to define a standard position for radiographic assessment of laryngeal tie-forward. Methods: Prospective clinical study. Methods: Adult horses (n=9) with palatal dysfunction. Methods: Left lateral radiographs of the larynx were obtained pre and postoperatively for 3 different head positions (flexed=90 degrees ; neutral=100 degrees ; extended=115 degrees ). Distance between thyrohyoid bone and thyroid cartilage was measured. Data were analyzed to investigate differences between head positions, and to compare differences between pre- and postoperative measurements. Results: Head position had a significant effect on relative position of the larynx and hyoid apparatus preoperatively. There was no significant difference in postoperative measurements of the 3 head positions. A significant difference between pre- and postoperative measurements was found with the head in the neutral or extended position whereas there were no significant differences between pre- and postoperative measurements using the flexed position. Conclusions: Head position affects the relationship between the hyoid apparatus and larynx preoperatively, with greatest distance occurring when the head is extended. In a flexed position, it is not possible to ascertain whether laryngeal position has changed postoperatively. Conclusions: A standardized head position is necessary when assessing the laryngeal tie-forward procedure radiographically. An extended head position is most useful for this assessment.
Publication Date: 2009-01-13 PubMed ID: 19134081DOI: 10.1111/j.1532-950X.2008.00425.xGoogle Scholar: Lookup The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
- Journal Article
- Research Support
- Non-U.S. Gov't
- Adult Horses
- Anatomy
- Clinical Findings
- Clinical Pathology
- Clinical Study
- Comparative Study
- Diagnosis
- Diagnostic Imaging
- Diagnostic Technique
- Disease Diagnosis
- Equine Health
- Horses
- Laryngeal Dysfunction
- Laryngoplasty
- Larynx
- Post-Operative Period
- Radiology
- Surgery
- Veterinary Medicine
- Veterinary Practice
- Veterinary Procedure
Summary
This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.
The research article is investigating how head position affects the relative position of the larynx and the hyoid apparatus in horses with problematic palates, and is suggesting a standard head position for radiographical assessments of laryngeal tie-forward procedures.
Methods
This was a prospective clinical study conducted on adult horses (n=9) suffering from palatal dysfunction. The research involves:
- Taking left lateral radiographs of the larynx pre- and postoperatively for three different head positions. These positions were flexed (equal to 90 degrees), neutral (equal to 100 degrees), and extended (equal to 115 degrees).
- Measuring the distance between the thyrohyoid bone and the thyroid cartilage.
- Analysing such data to observe any differences between head positions, and comparing pre- and postoperative measurements.
Results
The overall results showed that:
- Head position had a significant impact on the relative position of the larynx and hyoid apparatus before operation.
- There was no significant difference found in the measurements of the three head positions after operation.
- The most significant difference between pre- and postoperative measurements was found when the head was in a neutral or extended position. No significant differences were observed between pre- and postoperative measurements when using the flexed position.
Conclusions
Here are the main conclusions drawn from the research:
- Head position affects the relationship between the hyoid apparatus and larynx before operation, with the greatest distance occurring when the head is extended.
- In a flexed position, it is impossible to determine whether the laryngeal position has changed after operation.
- A standardized head position is necessary when assessing the laryngeal tie-forward procedure radiographically.
- An extended head position proves to be the most helpful for such assessment.
Cite This Article
APA
McCluskie LK, Franklin SH, Lane JG, Tremaine WH, Allen KJ.
(2009).
Effect of head position on radiographic assessment of laryngeal tie-forward procedure in horses.
Vet Surg, 37(7), 608-612.
https://doi.org/10.1111/j.1532-950X.2008.00425.x Publication
Researcher Affiliations
- Department of Clinical Veterinary Science, University of Bristol, Bristol, UK. Laura.McCluskie@bris.ac.uk
MeSH Terms
- Animals
- Female
- Horse Diseases / diagnostic imaging
- Horse Diseases / surgery
- Horses
- Larynx / abnormalities
- Larynx / diagnostic imaging
- Larynx / surgery
- Male
- Palate, Soft / abnormalities
- Palate, Soft / diagnostic imaging
- Palate, Soft / surgery
- Physical Conditioning, Animal / physiology
- Postoperative Care / veterinary
- Posture / physiology
- Preoperative Care / veterinary
- Prospective Studies
- Radiography
- Respiratory System Abnormalities / diagnostic imaging
- Respiratory System Abnormalities / surgery
- Respiratory System Abnormalities / veterinary
Citations
This article has been cited 5 times.- Ross CF, Laurence-Chasen JD, Li P, Orsbon C, Hatsopoulos NG. Biomechanical and Cortical Control of Tongue Movements During Chewing and Swallowing. Dysphagia 2023 Jun 16;.
- Lean NE, Sole-Guitart A, Ahern BJ. Laryngeal tie-forward in standing sedated horses. Vet Surg 2023 Feb;52(2):229-237.
- Go LM, Barton AK, Ohnesorge B. Objective classification of different head and neck positions and their influence on the radiographic pharyngeal diameter in sport horses. BMC Vet Res 2014 May 23;10:118.
- Plotsky K, Rendall D, Riede T, Chase K. Radiographic analysis of vocal tract length and its relation to overall body size in two canid species. J Zool (1987) 2013 Sep 1;291(1).
- Talbot AM, Shanks-Boon H, Baldwin CM, Barnes H, Maddox TW. Soft palate angle and basihyoid depth increase with tongue size and with body condition score in horses. Equine Vet J 2025 Jul;57(4):967-976.
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