Effects of Degree of Acetabular Rotation after Triple Pelvic Osteotomy on the Position of the Femoral Head in Relationship to the Acetabulum

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Abstract
Objective— To assess the effect of rotating the acetabulum 20° and 30° on percent coverage (PC) of the femoral head by the acetabulum and Norberg angle (NA) after triple pelvic osteotomy (TPO). Study design— Retrospective study. Animal Population— Fifty‐six client‐owned dogs. Methods— PC and NA were measured from preoperative, immediate postoperative, first recheck, and second recheck radiographs to compare the effects of 20° and 30° of rotation of the acetabulum after TPO for treatment of hip dysplasia. Results— Within the 20° rotation group, PC and NA values were significantly greater at each subsequent evaluation time starting at the preoperative measurement except for NA between the first and second recheck times. Within the 30° rotation group, PC and NA values were significantly greater at each subsequent evaluation time starting at the preoperative measurement except for PC and NA between the first and second recheck times. No significant differences between the 20° and 30° rotation groups were found at any corresponding times for either PC or NA. Conclusions— Acetabular rotation of 20° provided the same degree of improvement in acetabular femoral head coverage as 30° of rotation after TPO at the immediate postoperative, first recheck, and second recheck evaluation times. Clinical relevance— Based on PC and NA, 20° rotation of the acetabulum provides as much benefit as 30° of acetabular rotation when performing a TPO.