Knee - Rosenbergs

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Name of projection Knee - PA Weightbearing (Rosenbergs)This 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
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or stationary grid
Exposure 66 kVp
12 mAs
FFD / SID 100cm
Central Ray CR perpendicular to IR
Directed to a midpoint between the knee joints at a level of the patella apices
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 PA
Shielding Gonadal (check your department's policy guidelines)
RespirationNot applicable
  • 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 facing the upright bucky
  • Position feet straight ahead with weight evenly distributed on both feet (support handles may be required for some patients)
  • Flex knees 45° with both patellae touching the IR
  • CR perpendicular to IR, directed to a midpoint between the knee joints at a level of the patella apices

Area Covered
Special NotesThe maximum stresses in the knee joint occur between 30° and 60° of flexion; therefore, standard anteroposterior (AP) weight-bearing radiographs on extension are not ideal for evaluation of cartilage loss as indicated by joint space narrowing. The Rosenberg view was created to address this issue.

The Rosenberg view is a 45-degree flexion, posteroanterior, weight-bearing view of the knee with the patellae touching the image receptor.

The Rosenberg view is more sensitive and specific for joint space narrowing than the conventional extension weight-bearing anteroposterior views, and is useful for the assessment of knees with early degenerative change.