Objective: This study aimed to document the radiographic appearance of the femoral nutrient foramina and the variation of this in dogs undergoing total hip replacement (THR). Our hypothesis was that the radiographic appearance of the foramen would be consistent with the previously described anatomy, with some variations.
Animals: 89 client-owned dogs.
Methods: Preoperative radiographs were retrospectively analyzed for dogs undergoing THR at a single referral center. The signalment of all dogs was recorded. Radiographs were retrospectively examined to describe the number, direction, appearance, and foraminal index of the femoral nutrient foramen.
Results: Radiographs of 89 dogs and 102 femurs were examined. In 73 cases, a single foramen was seen; in 19 cases, no foramen was visible; and in 10 cases, 2 foramina were visible. The median foraminal index was 33.1% (range, 26% to 55.3%). On the mediolateral view, 72 were of proximocaudal-to-distocranial orientation, 19 were proximocranial to distocaudal, and 1 was atypical. On the craniocaudal or ventrodorsal views, the foramen was seen as a focal round radiolucency in 65 cases, was curved or atypical in 13 cases, and was not visible in 14.
Clinical Relevance: Radiolucent lines across the cortices that do not fit these criteria should raise suspicion of a femoral fissure, particularly within the context of THR.
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