Cardoso Afonso, Duarte Mafalda, Viegas Rui, Oliveira Filipe, Pinto Pedro, Rego Paulo
Departamento de Ortopedia e Traumatologia, Hospital Beatriz Ângelo, Loures, Portugal.
Faculdade de Medicina da Universidade de Lisboa, Lisboa, Portugal.
Rev Bras Ortop (Sao Paulo). 2021 Aug;56(4):513-516. doi: 10.1055/s-0040-1721360. Epub 2021 Mar 22.
The objective of the present work was to compare the measurement of acetabular component version on anteroposterior (AP) and on cross-table radiographs after total hip arthroplasty (THA). Radiographs of 60 hips with a primary THA were selected. Version was calculated on the AP radiograph using the Lewinnek method and, on the cross-table, using the Woo and Morrey direct method. Mean and standard deviation (SD) were different on both radiographs, being 9.7° ± 5.5° on the AP, whereas in the cross-table the measurements were 20.6° ± 8.4° ( < 0.001). Minding our aim of 10°, the cross-table measurements were statistically different from it ( < 0.001), while the AP measurement did not differ ( = 0.716). The present study showed that the best way to correctly evaluate the acetabular component positioning following a THA is by measuring anteversion and abduction on an AP radiograph after confirming, in a cross-table radiograph, that the component is not retroverted.
本研究的目的是比较全髋关节置换术（THA）后前后位（AP）和交叉台面X线片上髋臼假体旋转角度的测量结果。选择60例初次行THA的髋关节X线片。使用Lewinnek方法在AP X线片上计算旋转角度，在交叉台面X线片上使用Woo和Morrey直接法计算旋转角度。两张X线片上的平均值和标准差（SD）不同，AP片上为9.7°±5.5°，而在交叉台面X线片上测量值为20.6°±8.4°（P<0.001）。考虑到我们设定的10°目标，交叉台面测量值与之有统计学差异（P<0.001），而AP测量值无差异（P=0.716）。本研究表明，在THA后正确评估髋臼假体位置的最佳方法是在交叉台面X线片确认假体无后倾后，在AP X线片上测量前倾角和外展角。
