Knee - AP Bilateral WeightbearingThis is a featured page

Radiographic Positioning


Adult
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Name of projection Knee - AP Bilateral WeightbearingThis is a featured page
Area Covered Distal femur, proximal tibia and fibula, bilateral tibiofemoral joint spaces under the effects of gravity
Pathology shownJoint space narrowing due to cartilage degeneration or other knee joint pathologies
Radiographic AnatomyKnee Radiographic Anatomy
IR Size & Orientation 35 x 43cm
Landscape
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or stationary grid
FilterNo
Exposure 66 kVp
12 mAs
FFD / SID 100cm
Central Ray CR perpendicular to IR or 5° to 10° caudad on thin patients
Directed to a midpoint between the knee joints
1.2cm below the apex of the patella
Collimation Collimate to bilateral knee joint region
Include distal femur and proximal tibia / fibula to see alignment of joints
Markers Distal and Lateral
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
RespirationNot applicable
Positioning
  • Patient erect, standing on a step to place patient high enough for horizontal ray (Some X-ray tubes dont go all the way down to the ground, to counter this you raise the patient on a step)
  • Patient their back against the upright bucky
  • Position feet straight ahead with weight evenly distributed on both feet (support handles may be required for some patients)
  • Align and centre bilateral legs and knees to IR
  • CR perpendicular to IR or 5° to 10° caudad on thin patients, directed to a midpoint between the knee joints,1.2cm below the apex of the patella
Critique

Positioning
Area Covered
Collimation
Exposure
Special Notes



AndyC
AndyC
Latest page update: made by AndyC , Jun 18 2011, 8:43 AM EDT (about this update About This Update AndyC Edited by AndyC

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