Indications for imaging
Trauma, bone pain, joint replacements, soft tissue
calcifications, osteosarcoma
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Anatomy Demonstrated
Distal and mid to upper shaft and associated soft tissue
structures.
Lt Femur Anatomy
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
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Basic Patient Position
(Non Trauma)
The patient lies on the affected side and the upper limb is
flexed maximally and drawn up over and in front of the affected
limb and supported suitably. the knee of the affected side is
flexed 20 degrees to aid stability, and the long axis of
the femur is aligned to the long axis of the table.
(Trauma cases require a horizontal ray lateral)
With the patient supine on the table and the affected limb
aligned to the long axis of the table. A small support is placed
under the knee to raise the knee off the table, the unaffected leg
is flexed 90 degrees at the hip and knee and supported.
Rt Femur Patient Position Non Trauma
Rt Femur Patient Position Trauma
Meschan, I. 1955 An Atlas of Normal Radiographic Anatomy
Saunders, London
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Radiation protection
Direct lead rubber gonad protection.
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Central Ray
(Non Trauma)
The vertical central ray is directed to the midshaft of the
femur midway between the anterior and posterior skin surfaces to
include the knee joint on the film.
(Trauma cases require a horizontal ray lateral)
The horizontal central ray is midway between the anterior and
posterior skin surfaces to include the knee joint on the film. |
Exposure Factors
| Kv |
mAS |
FFD (cm) |
Grid |
Focus |
AEC |
Cassette |
| 75/80 |
10/20 |
100 |
Yes / No |
Broad |
No / Yes |
35 x 43 cm |
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Evaluation of the Image
ID and markers must be present and correct in the appropriate
area of the film
Evidence of collimation on four sides equally around the
centering point.
Limits of the examination, distally the proximal 2 cm of the
tibia, proximally as much of the proximal femur as allowed by
the film and patient size, laterally and medially the skin
margins.
The femoral condyles should be superimposed.
Optimal exposure should penetrate all the bone structures and
contrast should be low enough to visualise fully the bone and
soft tissue structures.
Lt Femur Radiograph
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Related Projections
Femur AP
Pelvis AP
Hip AP & Lat.
Knee AP and Lateral
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Additional modalities
CT
RNI
MRI
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