Influence of Radiographic Positioning on Canine Sacroiliac and Lumbosacral Angle Measurements

Susan Jones, Mason Savage, Brian Naughton, Susheela Singh, Ian Robertson, Simon C. Roe, Denis J Marcellin-Little, Kyle G. Mathews

Research output: Contribution to journalArticlepeer-review


OBJECTIVES:  To evaluate the influence of radiographic malpositioning on canine sacroiliac and lumbosacral inclination angles.

METHODS:  Using canine cadavers, lateral pelvic radiographs were acquired with the radiographic beam in a neutral position and then rotated 5, 10 and 15° to mimic rotational malpositioning. The focal point of the beam was then focused over the abdomen and again over mid-diaphysis of the femur to mimic an abdominal or femoral radiographic study.

RESULTS:  Five degrees of rotational malpositioning did not influence measurements of sacroiliac or lumbosacral inclination, but malpositioning by more than 5° led to a significant decrease in both sacroiliac and lumbosacral angles. Moving the focal point to the femur significantly decreased the measured lumbosacral angle. Abdominally centred radiographs had no effect on lumbosacral and sacroiliac angle measurements.

CLINICAL SIGNIFICANCE:  When evaluating canine lumbosacral and sacroiliac angles radiographically, pelvic rotation of more than 5° should be avoided as should the use of lateral radiographs centred over the femur.

Original languageEnglish (US)
Pages (from-to)30-36
Number of pages7
JournalVeterinary and comparative orthopaedics and traumatology : V.C.O.T
Issue number1
StatePublished - Jan 1 2018
Externally publishedYes

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)


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