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Citation, DOI & article dataCitation: Murphy, A., Qureshi, P. Knee (skyline Laurin view). Reference article, Radiopaedia.org. (accessed on 09 Oct 2022) https://doi.org/10.53347/rID-50634 The knee skyline Laurin view is an inferior-superior projection of the patella. It is one of many different methods to obtain an axial projection of the patella. On this page:This view is used in trauma to assess for a patellar fracture or subluxation and in orthopedics for patellofemoral joint disease.1 It is best suited to patients able to maintain a semi-recumbent position on the examination table.
This projection is one of the more technically demanding projections of the lower limb. Hence it being one of seven techniques (that the author can find) to achieve it. This particular method has a high yield if your patients can tolerate the position. Some points to consider when performing this projection:
ReferencesRelated articles: Imaging in practicePromoted articles (advertising)How much is the knee flexed for a lateral projection of the patella? For an AP oblique projection of the knee, the limb is rotated: What is the CR angle for a lateral projection of the patella? Where does the CR enter the knee for a lateral projection of the patella? Through the patellofemoral joint space Where is the CR directed for a tangential projection (Settegast method) of the patella? Through the patellofemoral jt space What is the degree of angulation for the tangential projection of the patella (Settegast method)? variable—depending on the degree of knee flexion Where is the CR directed for an AP projection of the knees--- weight-bearing? 1/2 inch below the patellar apex What will the this method demonstrate? How is the CR directed for the PA Axial projection (Homblad method)? Perpendicular to lower leg Which of the following is used to demonstrate the intercondylar fossa using the Homblad method? 1. standing (horizontal CR) 2. Kneeling on table (vertical CR) 3. Standing with knee on stool (vertical CR) Which position is the patient placed in for a PA projection of the patella? T/F: The correct CR placement for an AP knee is midpatella For the AP weight-bearing knee on the average patient, the CR should be: What knee projection requires use of a special IR holding device? Bilateral Merchant Method T/F: The mediolateral projection of the femur will demonstrate the entire femur with one single exposure. For an AP oblique projection of the knee, the limb is rotated: What's clearly demonstrated on an AP oblique projection of the knee with medial rotation? Which of the following are used to demonstrate the intercondylar fossa? 1. Homblad 2. Camp Coventry 3. Settegast The CR angle for an AP, bilateral weight-bearing knee is: A radiograph of an AP knee reveals rotation with almost total superimposition of fibular head and proximal tibia. What nust the tech do to correct this? Situation: Patient comes to the radiology department for a knee study with special interest in region of proximal tibfib joint and lateral condyle of tibia. What positioning routine should the tech obtain? AP, lateral and medial oblique knee A geriatric patient comes to the radiology department for an intercondylar fossa study of the knee. The patient is unsteady and unsure of himself. If choosing between the Holmblad or the Camp-Coventry methods, the ___ intercondylar fossa projection might provide the best results without risk of injury to the patient. A patient enters ER with a possible transverse fracture of the patella. What will safely provide best images? AP and horizontal beam lateral, no flexion Situation: Patient comes to ER with possible tibial collateral ligament tear. Which should be performed? What projection best demonstrates Osgood Schlatter? T/F: A 3 to 5 degree caudal CR angle should be used for an AP knee of a patient with THICK thighs What CR angle is required for an AP projection of the knee if patients ASIS-to-tabletop measurement is 18cm? Which projection of the knee will best demonstrate the styloid process of the fibula without superimposition? AP oblique with medial rotation What CR angle would be used for a lateral projection of the knee on a short, wide- pelvis patient? Whats the major disadvantage of using 45 degree flexion for the lateral projection of the knee? Draws patella into intercondylar sulcus To ensure that both joints are included pm am AP projection of the tib/fib on an adult, the technologist should: T/F: AP weight-bearing projections of the knee should have knee flexed 20 degrees with a 10 degree caudal CR angle How much knee flexion is recommended for a lateral patella? How much knee flexion is required for the Settegast method? The posterior visibility of the adductor tubercle on a lateral knee indicates: Under-rotation of knee toward the IR The CR angulation for a lateral projection of the knee is: 3-5 cephalic for thick patients 3-5 caudal for thin patients 0 degrees for average patients What is the CR angle for a PA projection of the patella? Where is the CR directed for AP knee? 1/2" below the patellar apex What projection best demoinstrates a narrowing of the joint space? Bilateral knees weight-bearing How is the CR directed for the Homblad? perpendicular to the lower leg Which are clearly demonstrated on a lateral leg? 1. knee jt 2. ankle jt 3. entire femoral condyles How much should the leg be flexed for a lateral projection of the knee? When the ASIS to tabletop measurement is greater than 24 cm, the CR is: Knee is in correct position for a lateral patella if: 1. leg is flexed 20 to 30 degrees 2. Epicondyles are superimposed 3. Patella is perpendicular to IR How are the femoral condyles when the leg is correctly positioned for an AP projection? How much is the knee flexed for a lateral projection of the patella? Which of the following will ensure that the knee is in proper position for a lateral projection? What CR angulation is required for an AP projection of the knee on a patient with an Asus to table top measurement of 18 cm?A 3° to 5° caudad CR angle should be used for an AP knee projection for patients with an ASIS-to-tabletop measurement of 20 cm.
What is the CR angle for an AP projection of the leg?Central ray Directed to joint space between patella and femoral condyles at an angle of 25- 30 degrees caudad.
What Cr angle should be used for a lateral projection of the knee?Chapter 7. What type of CR angle is required for the PA axial weightIn the Rosenberg method, a 10-degree caudal angle is used with the CR centered between the knee joints at a point 1/2 inch (1.3 cm) below the patellar apices. Collimation to the bilateral knee joint region with the distal femur and proximal tibia included on each side for alignment.
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What CR angulation is required for an AP projection of the knee on a patient with an ASIS to tabletop measurement of 18 cm?
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