เทคนิคการถ่ายภาพรังสีในท่ากดข้อสะโพก เพื่อประเมินข้อสะโพกเคลื่อนบางส่วน ในสุนัขที่มีข้อสะโพกเจริญผิดปกติ / ดวงเดือน แก่นค้างพลู = Radiographic stress techniques for evaluation of coxofemoral joint subluxation in dogs with hip dysplasia / Duangdaun Kaenkangploo
Two new radiographic stress techniques were compared with standard technique for evaluation of coxofemoral joint subluxation in dogs with hip dysplasia. 40 healthy large breed dogs were divided into 2 groups of 20 dogs. Group 1 had normal hips. Group 2 were dogs with mild to moderate grade of hip dysplasia on the standard of The Orthopedic Foundation for Animals (OFA). Dogs were anesthetized and placed in dorsal recumbency before standard hip extened technique, 60 degree, and 90 degree stress techniques were taken. For the 60 degree stress technique, hind legs were extended in parallel to each other at 60 degree to the table top and stifles were rotated inward and pushed craniodorsally during exposure. For the 90 degree stress technique, both femurs were positioned 90 degrees to the table top with the tibias were parallel to the table top, and the stifles were adducted and pushed craniodorsally during exposure. From all radiographs, subluxation index(SI) and dorsolateral subluxation score (DLS Score) of coxofemoral joints were assessed. SI of normal dogs from standard, 60 degree, and 90 degree stress techniques were 0.152, 0.196, and 0.231, and of dysplstic dogs were 0.339, 0.393, and 0.413 respectively. The degrees of subluxation assessed from the two stress technique radiographs were significantly greater than those shown on the standard technique radiographs (p<0.05) in both groups of dogs. DLS scores of normal dogs from standard, 60 degree, and 90 degree stress techniques were 65.14%, 64.33%, and 60.94%, and of dysplastic dogs were 55.42%, 53.61%, and 47.58% respectively. Mean of DLS scores assessed from the 90 degree radiographs was significantly lower than those assessed from radiographs of other two techniques (p<0.05) in both groups of dogs. There was moderated correlation between SI and DLS scores in every techniques.
