Evaluation of sacroiliac wedge rotation to increase acetabular ventroversion - A canine cadaver study

Treatment of canine hip dysplasia (CHD) via triple pelvic osteotomy (TPO) i s widely accepted as the treatment that best preserves the existing hip joi nt. TPO, however, has several important disadvantages. In an effort to avoi d some of the difficulties associated with TPO an alternative method of cre ating acetabular ventroversion (AVV) was sought. The purpose of this study was to explore the effects of placement of a wedge in the sacroiliac (SI) j oint on AVV and to compare this to the effect of TPO on AVV. On one hemipel vis a 30 degrees pelvic osteotomy plate was used for TPO. The contralateral hemipelvis had a 28 degrees SI wedge inserted into the SI joint. Pre- and postsurgical radiographs of each pelvis were taken and the angular measurem ents were recorded. On average, the 28 degrees SI wedge resulted in 20.9 de grees of AVV, the 30 degrees canine pelvic osteotomy plate resulted in 24.9 degrees AVV. Significant differences were not found (p >0.05) between the two techniques. Sacroiliac wedge rotation effectively creates AVV and has s everal theoretical advantages when compared to TPO. The in vivo effects of sacroiliac wedge rotation should be studied in order to evaluate the clinic al effect of the technique.