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Vet Surg. 2009 Jul;38(5):601-6. doi: 10.1111/j.1532-950X.2009.00536.x.

A tangential radiographic projection for investigation of the equine temporomandibular joint.

Author information

1
Division of Veterinary Clinical Science, Royal (Dick) School of Veterinary Studies, University of Edinburgh, UK. neil.townsend@ed.ac.uk

Abstract

OBJECTIVE:

To (1) describe a tangential radiographic projection of the equine temporomandibular joint (TMJ) and (2) optimize the radiographic angle and determine its use in standing sedated horses.

STUDY DESIGN:

Descriptive study.

ANIMALS:

Cadaveric equine skulls (n=11); 8 horses with a history of quidding or headshaking.

METHODS:

Tangential radiographic projections were taken of a TMJ of a cadaveric skull before and after intra-articular injection of radiographic contrast. Additional tangential radiographic projections were taken after TMJ dissection and placement of a wire along the articular surface of the mandibular condyle. Subsequently, 3 tangential radiographs were taken of both TMJs of 10 skulls at 75 degrees , 70 degrees , and 65 degrees to the dorsal plane (Rt/Le15Cd70D-Le/RtRVO). Each of the 3 images for each TMJ was ranked by 4 observers who were unaware of the projection angle. Interobserver variation was calculated using a Friedman analysis of variance and significance of the most prevalent angle with a 1-sample repeated measures test. Tangential radiographic projections of both TMJs were then taken of 8 standing sedated horses.

RESULTS:

Tangential radiographic projections allowed the lateral half of the TMJ to be viewed without superimposition of other structures and the anatomic orientation was determined. A 70 degrees projection to the dorsal plane was ranked as significantly better than other views (P<.001). There was no significant interobserver variation and the technique was safely performed in standing sedated horses with excellent image quality obtained.

CLINICAL RELEVANCE:

Tangential radiography of the TMJ may complement and add to information obtained from clinical examination and ultrasonography before referral for more advanced imaging techniques.

[Indexed for MEDLINE]

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