Comparative radiographic analysis on the anatomical axis in knee osteoarthritis cases: inter and intraobserver evaluation

• Published in: Revista brasileira de ortopedia 2015-05, Vol.50 (3), p.283-289
• Main Authors: Matos, Luiz Felipe, Giordano, Marcos, Cardoso, Gustavo Novaes, Farias, Rafael Baptista, e Albuquerque, Rodrigo Pires
• Format: Article
• Language: English
• Subjects: Extremidade inferior; Joelho; Knee; Lower extremity; Original; ORTHOPEDICS; Osteoarthritis/radiography; Osteoartrite; Osteoartrite/radiografia
• ISSN: 2255-4971; 1982-4378; 2255-4971
• DOI: 10.1016/j.rboe.2015.05.003

To make a comparative inter and intraobserver analysis on measurements of the anatomical axis between panoramic radiographs of the lower limbs in anteroposterior (AP) view with bipedal weight-bearing, on short film. An accuracy study comparing radiographic measurements on 47 knees of patients attending the knee surgery outpatient clinic due to osteoarthritis. The radiographic evaluation used was as standardized for the total knee arthroplasty program, including panoramic AP views of the lower limbs and short radiographs of the knees in AP and lateral views, all with bipedal weight-bearing. Following this, the anatomical axis of the lower limbs or the femorotibial angle was measured by five independent examiners on the panoramic and short AP radiographs; three of the examiners were considered to be more experienced and two, less experienced. All the measurements were made again by the same examiners after an interval of not less than 15 days. The statistical analysis was performed using the intraclass correlation coefficient, in order to evaluate the inter and intraobserver concordance of the anatomical axis measurements. From the statistical analysis, it was observed that there was strongly significant concordance between the anatomical axis measurements on the panoramic and short radiographs, for all the five examiners and for both measurements. Under the conditions studied, short radiographs were equivalent to panoramic radiographs for evaluating the anatomical axis of the lower limbs in patients with advanced osteoarthritis. The measurements used also showed high rates of inter and intraobserver concordance and reproducibility. Fazer a análise comparativa inter e intraobservador da medida do eixo anatômico entre as radiografias panorâmica, dos membros inferiores (MMII) com raio anteroposterior (AP) e apoio bipodálico e AP com carga bipodal em filme curto. Foi feito estudo de acurácia que comparou medidas radiográficas em 47 joelhos de pacientes do ambulatório de cirurgia do joelho, por osteoartrite (OA). A avaliação radiográfica usada foi a padronizada para a programação de ATJ, incluindo as incidências panorâmica dos MMII em AP e as radiografias curtas dos joelhos em AP e perfil, todas com apoio bipodálico. Em seguida, as radiografias panorâmicas e curtas em AP tiveram os eixos anatômicos dos MMII ou ângulo femorotibial (AFT) medidos por cinco examinadores independentes, dos quais três eram considerados mais experientes e dois menos experientes. Todas