Wang, Liao Thoreson, Andrew R Trousdale, Robert T Morrey, Bernard F Dai, Kerong An, Kai-Nan Radiographic cup anteversion measurement corrected from pelvic tilt. An image quality indicator for estimating photographic and geometric unsharpness is described. Results of measurements made with video micrometry are compared with scanning microdensitometer and micrometric physical measurements. An electronic density slicing method for automatic edge definition is described. Based on this study, an edge definition criterion is proposed for overcoming image unsharpness effects in taking accurate diametral measurements from radiographs. The use of video-electronic image analysis relative to edge definition in radiographic images is described. Means of obtaining improved dimensional measurements from neutron radiographs of nuclear fuel elements are discussed. Diagnostic study, Level II.Īpplication of an electronic image analyzer to dimensional measurements from neutron radiographs On short lateral knee radiographs, only a estimation of the PTS can be carried out. The PTS measurements in long lateral knee radiographs are more accurate compared to short radiographs.
Using short distances below the tibial plateau (6 and 10 cm) resulted in an overestimation of the PTS of 3°, on average. Significant differences between PTS results were found for all three diaphyseal axes, with the smallest differences and the strongest correlation for a diaphyseal axis at 16 and 20 cm below the tibial plateau. The PTS was measured on 100 consecutive lateral radiographs of the lower limb using the mechanical and three diaphyseal axes with various distances below the tibial plateau. The purpose of the present study therefore was to analyse the relationship between PTS measurement results on short and expanded lateral knee radiographs. Only lateral knee radiographs are routinely obtained after TKA, however. Exact definition of the posterior tibial slope (PTS) requires lateral radiographs of the lower limb. The posterior tibial slope influences both the natural knee stability as well as the stability and kinematics after total knee arthroplasty (TKA). Can the tibial slope be measured on lateral knee radiographs?įaschingbauer, M Sgroi, M Juchems, M Reichel, H Kappe, T
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