TY - JOUR
T1 - Axial knee radiographs
T2 - Consistency across clinic sites
AU - Nord, Ashley
AU - Agel, Julie
AU - Arendt, Elizabeth A.
N1 - Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.
PY - 2014/9/1
Y1 - 2014/9/1
N2 - Conclusions: Radiographic protocols for knee axial imaging are inconsistent in radiographic positioning and imaging. This variability can lead to disparity in radiographic image results used for clinical decision-making. Standardization of radiographic positioning would yield more consistent imaging of patella position in early flexion, increasing clinical utility and accuracy.Purpose:Methods: Radiographic positioning, including beam angle and knee flexion, was measured using a photograph taken of a phantom leg and (human) model set-up. An axial radiograph of a phantom leg was taken at seven different outpatients musculoskeletal clinics to assess patella position (lateral tilt/translation). The phantom leg patella was placed in an abnormal position for the radiographic image across all sites.Results: Knee flexion <30° was less accurate in obtaining requested knee flexion than higher knee flexion angles (phantom limb error averaged 6°, range 4°–7° human model error averaged 15°, range 11°–25°). Of the five sites utilizing a ‘Merchants’ axial radiographs, the congruence angle varied from +12° to +29°, being normal at one site (+12°) and abnormal (>+16°) at three sites, and negative at one site (−15°).
AB - Conclusions: Radiographic protocols for knee axial imaging are inconsistent in radiographic positioning and imaging. This variability can lead to disparity in radiographic image results used for clinical decision-making. Standardization of radiographic positioning would yield more consistent imaging of patella position in early flexion, increasing clinical utility and accuracy.Purpose:Methods: Radiographic positioning, including beam angle and knee flexion, was measured using a photograph taken of a phantom leg and (human) model set-up. An axial radiograph of a phantom leg was taken at seven different outpatients musculoskeletal clinics to assess patella position (lateral tilt/translation). The phantom leg patella was placed in an abnormal position for the radiographic image across all sites.Results: Knee flexion <30° was less accurate in obtaining requested knee flexion than higher knee flexion angles (phantom limb error averaged 6°, range 4°–7° human model error averaged 15°, range 11°–25°). Of the five sites utilizing a ‘Merchants’ axial radiographs, the congruence angle varied from +12° to +29°, being normal at one site (+12°) and abnormal (>+16°) at three sites, and negative at one site (−15°).
KW - Axial radiograph
KW - Patella imaging
KW - Patella tilt
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U2 - 10.1007/s00167-014-2982-9
DO - 10.1007/s00167-014-2982-9
M3 - Article
C2 - 24788273
AN - SCOPUS:84921658829
SN - 0942-2056
VL - 22
SP - 2401
EP - 2407
JO - Knee Surgery, Sports Traumatology, Arthroscopy
JF - Knee Surgery, Sports Traumatology, Arthroscopy
IS - 10
ER -