Difference between revisions of "Femur - Lateral"
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Latest revision as of 16:46, 11 November 2020
Radiographic Positioning
Adult | Other related pages of interest |
Name of projection | Femur - Lateral This table looks at the proximal femur. See table below for the distal femur. The lateral femur image must cover the entire femur including the hip joint and the knee joint. If the entire femur cannot be included in a single image, two must be taken with a minimum of 5 cm (2 inches) overlap. The size of the second IR will depend on the coverage required. In this case it may be simply an lateral knee |
Area Covered | Proximal half to two thirds of femoral shaft, femoral head, femoral neck, trochanters, hip joint |
Pathology shown | Fractures, lesions |
Radiographic Anatomy | Femur Radiographic Anatomy |
IR Size & Orientation | 35cm x 43cm Portrait |
Film / Screen Combination | Regular (CR and DR as recommended by manufacturer) |
Bucky / Grid | Moving or stationary grid |
Filter | No |
Exposure | 70 kVp 16 mAs |
FFD / SID | 100cm |
Central Ray | Directed to mid-femur Perpendicular to IR |
Collimation | Centre: align the upper edge of the IR to the level of the anterior superior iliac spines (ASIS's) Shutter A: to the full length (43 cm or 17 inches) of the IR Shutter B: within 1.25cm (half an inch) of the skin-line Note: the position of the proximal and mid femoral shaft is nearer the anterior aspect of the thigh |
Markers | Lateral to mid-femur shaft Marker orientation is AP |
Shielding | Not usually possible as gonadal shielding may obscure essential anatomy (check your department's policy guidelines) |
Respiration | Not applicable |
Positioning |
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Critique | Positioning
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Special Notes | Effect of incorrect rotation
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Name of projection | Femur - Lateral This table looks at the distal femur. See table above for the proximal femur. The lateral femur image must cover the entire femur including the hip joint and the knee joint. If the entire femur cannot be included in a single image, two must be taken with a minimum of 5 cm (2 inches) overlap. The size of the second IR will depend on the coverage required. In this case it may be simply a rolled lateral hip ---- Under Construction --- |
Area Covered | Distal 2/3rds of femoral shaft, patella, proximal tibia and fibula, knee joint |
Pathology shown | Fractures, lesions |
Radiographic Anatomy | Femur Radiographic Anatomy |
IR Size & Orientation | 35cm x 43cm Portrait |
Film / Screen Combination | Regular (CR and DR as recommended by manufacturer) |
Bucky / Grid | Moving or stationary grid |
Filter | No |
Exposure | 70 kVp 16 mAs |
FFD / SID | 100cm |
Central Ray | Directed to mid-femur Perpendicular to IR |
Collimation | Centre: align the lower edge of the IR to 5cm (2 inches) below the knee joint Shutter A: to the full length (43 cm or 17 inches) of the IR Shutter B: within 1.25cm (half an inch) of the skin-line |
Markers | Lateral to mid-femur shaft Marker orientation is AP |
Shielding | Gonadal (check your department's policy guidelines) |
Respiration | Not applicable |
Positioning |
|
Critique | Positioning
|
Special Notes | Mispositioning is assessed by viewing the anterior and posterior margins of the condyles
If a fracture is suspected, this projection can be achieved in the supine position using a horizontal ray with the IR against the medial aspect of the affected femur |