Radiographic parameters for evaluating hip development are altered by Salter osteotomy, and their prognostic value require further validation. A total of 63 patients who underwent open reduction and Salter osteotomy for unilateral hip dysplasia were evaluated with Severin classification 10.8 years later. The initial first-year postoperative acetabular index, c/b ratio, head–teardrop distance, and head coverage were compared with the final outcome of Severin classification. Greater c/b ratio was significantly associated with later Severin class III hip. Using receiver operating characteristics curve, a c/b ratio greater than 0.72 at 6 months and 1 year postoperatively can predict the possibility of a class III hip in 30 and 60% of patients, respectively.
aDepartment of Pediatric Orthopedics, Chang Gung Memorial Hospital, Chang Gung University, Taoyuan
bDepartment of Orthopedics, Chung Shan Hospital
cCollege of Medicine, Taipei Medical University
dDepartment of Orthopedics, National Taiwan University Hospital, Taipei, Taiwan
Correspondence to Ken N. Kuo, MD, College of Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan Tel: +886 2 2736 1661; fax: +886 2 2739 0214; e-mail: firstname.lastname@example.org