Femur, Hip, Pelvis, WB Studies Flashcards
What method name will demonstrate the lateral hip joint while utilizing a horizontal CR?
Danelius- Miller
What is the degree and direction that the leg should be turned for an AP pelvis and why should this be done?
15-20 degrees inverted (medially rotated) direction to pull the femoral necks parallel to the IR. This also pulls the greater trochanter in profile.
List the proper SID used for the following exams. Leg length study --1-- Upright pelvis --2-- AP proximal femur --3-- "Frog" lateral --4--
Leg length study- 8 feet/96 inches
Upright pelvis- 72 inches
AP proximal femur- 40 inches
“Frog” lateral- 40 inches
What is the method name for a “frogleg” of the hip?
Modified Cleaves Method
What device is used to even out the various densities that are present on a leg length study?
Compensating filter (thick part of filter; put towards he knee/ankle)
For the lateral distal femur radiograph the knee should be flexed –1– degrees and the –2– will be somewhat superimposed (not completely due the divergence of the CR).
- 45 degrees
2. femoral condyles
For the AP hip radiograph where should the film be placed?
Top of film at ASIS
For the x-table lateral hip position, the CR should be –1– to the femoral neck while the IR should be –2–.
- perpendicular
2. parallel
When performing the AP pelvis the CR should be directed to –1–.
2 inches below ASIS
The portion of the pelvis that we sit on is called the –1–.
Ischial Tuberosity
When the feet/ legs are –1– the lesser trochanters will be demonstrated or seen best.
Everted
In order to adequately demonstrate the entire pelvis and upper 1/2 of the femurs in the weight bearing position the film is best placed –1–.
Lenghtwise
The age of the pediatric hip study is –1–.
4 mths- 17 yrs old
The age of the infant hip study is –1–.
1 day- 4 mths
The “AP hip” projection/position/view is theoretically the same as the –1–.
AP proximal femur
Explain how we would perform the bilateral Modified Cleaves Method for hips.
Flet? hips and knees so femurs are vertical. Abduct femurs and place soles of feet together. The degree varies between 25-45 degrees. Make sure you have equal abduction of both femurs and center 1 inch above pelvis symphysis. (Maybe?)
Why would a frog leg be contraindicated for hip and/or femur studies?
If the patient has a suspected fracture, prosthetic device, or other pathologic disease.
What are 2 important instructions to give your patient when performing an upright weight bearing pelvis study?
- Remove shoes (may have a lift in shoes)
2. Stand with equal weight on both feet. (will throw measurements off)
For bilateral “frog” or Modified Cleaves Method, the CR should be directed to –1–.
1 inch superior to the pubic symphysis
For the unilateral “frog” or Modified Cleaves Method, the CR should be directed to the –1–.
femoral neck
What anatomy must be included on the weight bearing leg length radiograph?
hip joint t ankle joint
Any weight bearing study of the joints is used to demonstrate the possible presence of –1–.
joint space narrowing
What specific “hip/pelvic” structure is used to measure leg length when shown in a weigh bearing position?
acetabulum
What should be done to the unaffected leg when performing a lateral distal femur?
draped up over the affected leg
What should be done to the unaffected leg when performing a lateral proximal femur?
It should be placed posteriorly
List the structures with the fractional divisions and anatomic directions that make the acetabulum.
- Ilium 2/5 superiorly
- Ischium 2/5 posteriorly
- Pubis 1/5 anteriorly
List the 3 ways to localiz the hip joint.
- Bisect “crease” of leg/hip
- Go in 2 inches from greater trochanter
- Locate ASIS and pubic symphysis, bisect this line and come down at a right angle 2 inches.
What should be done with the unaffected leg when performing the cross table lateral (axiolateral projection) for hip?
Elevated to place the thigh in a vertical position (Danelius-Miller Method)
From a technical standpoint, what are some ways to improve the image quality when performing the cross-table lateral hip?
- Use a grid
- Collimate
- Compensating Filter
- Part in center of IR
The proper respiration for femur, hip, and pelvis should be –1–.
suspend respiration
