Knees Flashcards
what is the SID for knee views
100-110cm
what is the kV for knee views
60-65kV
what is the mAs for knee views
4-5mAs
do you use grids for knee views
depends on the view
what is the CP for the AP knee view
perpendicular to 1cm distal to the patella apex
what is the patient positioning for AP knee
in terms of the leg, knee rotation, patella and intercondylar line
fully extend the leg
internally rotate the knee
centralise the patella
intercondylar line parallel to the IR
what is the area to be included in the collimation for AP knee view
distal femur to the proximal tibia/fibula
what joint space needs to be open for the AP knee view
femorotibial joint space open
if you see too much of the fibula head in the AP knee view what does this mean
too much fibula head = internally rotated
if you see too little of the fibula head in the AP knee view what does this mean
externally rotated
in the AP knee view where should the patella be located
what does it rest on and what is it superimposing
resting on the superior portion of the image, superimposing the distal femur
the femoral and tibial condyles should look like what in the AP knee view
symmetrical
what is the image critique for the AP knee view in terms of the positioning
in terms of which joint space needs to be open, intercondylar eminence, condyles
what 4 things need to be superimposed
femoral tibial joint space open
intercondylar eminence seen in the intercondylar fossa centre
femoral and tibial condyles symmetrical
head of fibula slightly superimposed by the lateral tibial condyle
patella superimposes the distal femur
what is the CP for a lateral/rolled knee view
5* cranial angle
2.5cm distal to the medial epicondyle
what way lateral is the lateral/rolled knee
mediolateral
what is the patient positioning for a lateral/rolled knee
in terms of the knee flexure and what things need to be parallel to the table
flex knee 20-30*
pad under the heel so tib/fib and femur are parallel to the table
for a lateral/rolled knee what shows no rotation
patella in profile
for a lateral/rolled knee what joint space is needed and what needs to be superimposed
patellofemoral joint needs to be open
femoral condyles superimposed
what is the image critique for the lateral/rolled knee view in terms of the positioning
in terms of what 4 things need to be superimposed, the patella and the femoral condyles
tibia superimposes 1/2 fibula head
posterior and distal borders of femoral condyles superimposed
patella in profile and patellofemoral joint space open
what is the area of interest for knee views
distal femur to proximal tibia and fibula
what is the CP for lateral hori-ray knee view
perpendicular to the knee joint
1.5-2cm distal to the patella apex
what kind of lateral is the lateral hori-ray knee
lateromedial
what is the patient positioning for the lateral hori-ray knee
in terms of affected knee flexion, sponge use, detector placement
affected knee flexed 20*
45* sponge pad under knee
IR against medial knee running parallel to the affected leg
what is the AP weight bearing knee view used to assess
in terms of anatomy and pathology
knee joint, distal femur, proximal tibia/fibula and patella
evaluates OA
